648 lines
22 KiB
JavaScript
648 lines
22 KiB
JavaScript
const QR = require('./qrcode.js')
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const GD = require('./gradient.js')
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export default class Painter {
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constructor(ctx, data) {
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this.ctx = ctx
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this.data = data
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this.globalWidth = {}
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this.globalHeight = {}
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}
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paint(callback) {
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this.style = {
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width: this.data.width.toPx(),
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height: this.data.height.toPx()
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}
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this._background()
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if (this.data.views && this.data.views.length > 0) {
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for (const view of this.data.views) {
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this._drawAbsolute(view)
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}
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}
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callback && callback()
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}
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_background() {
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this.ctx.save()
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const { width, height } = this.style
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const bg = this.data.background
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this.ctx.translate(width / 2, height / 2)
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this._doClip(this.data.borderRadius, width, height)
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if (!bg) {
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// 如果未设置背景，则默认使用透明色
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this.ctx.fillStyle = 'transparent'
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height)
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} else if (bg.src) {
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// 背景填充图片
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this.ctx.drawImage(bg, -(width / 2), -(height / 2), width, height)
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}else if (bg.startsWith('#') || bg.startsWith('rgba') || bg.toLowerCase() === 'transparent') {
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// 背景填充颜色
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this.ctx.fillStyle = bg
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height)
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} else if (GD.api.isGradient(bg)) {
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GD.api.doGradient(bg, width, height, this.ctx)
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height)
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}
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this.ctx.restore()
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}
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_drawAbsolute(view) {
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if (!(view && view.type)) {
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// 过滤无效 view
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return
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}
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// 证明 css 为数组形式，需要合并
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if (view.css && view.css.length) {
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/* eslint-disable no-param-reassign */
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view.css = Object.assign(...view.css)
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}
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switch (view.type) {
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case 'image':
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this._drawAbsImage(view)
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break
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case 'text':
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this._fillAbsText(view)
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break
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case 'rect':
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this._drawAbsRect(view)
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break
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case 'qrcode':
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this._drawQRCode(view)
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break
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default:
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break
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}
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}
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_border({ borderRadius = 0, width, height, borderWidth = 0, borderStyle = 'solid' }) {
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let r1 = 0,
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r2 = 0,
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r3 = 0,
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r4 = 0
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const minSize = Math.min(width, height)
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if (borderRadius) {
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const border = borderRadius.split(/\s+/)
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if (border.length === 4) {
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r1 = Math.min(border[0].toPx(false, minSize), width / 2, height / 2)
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r2 = Math.min(border[1].toPx(false, minSize), width / 2, height / 2)
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r3 = Math.min(border[2].toPx(false, minSize), width / 2, height / 2)
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r4 = Math.min(border[3].toPx(false, minSize), width / 2, height / 2)
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} else {
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r1 = r2 = r3 = r4 = Math.min(borderRadius && borderRadius.toPx(false, minSize), width / 2, height / 2)
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}
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}
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const lineWidth = borderWidth && borderWidth.toPx(false, minSize)
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this.ctx.lineWidth = lineWidth
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if (borderStyle === 'dashed') {
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this.ctx.setLineDash([(lineWidth * 4) / 3, (lineWidth * 4) / 3])
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// this.ctx.lineDashOffset = 2 * lineWidth
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} else if (borderStyle === 'dotted') {
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this.ctx.setLineDash([lineWidth, lineWidth])
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}
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const notSolid = borderStyle !== 'solid'
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this.ctx.beginPath()
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notSolid && r1 === 0 && this.ctx.moveTo(-width / 2 - lineWidth, -height / 2 - lineWidth / 2) // 顶边虚线规避重叠规则
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r1 !== 0 && this.ctx.arc(-width / 2 + r1, -height / 2 + r1, r1 + lineWidth / 2, 1 * Math.PI, 1.5 * Math.PI) //左上角圆弧
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this.ctx.lineTo(r2 === 0 ? (notSolid ? width / 2 : width / 2 + lineWidth / 2) : width / 2 - r2, -height / 2 - lineWidth / 2) // 顶边线
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notSolid && r2 === 0 && this.ctx.moveTo(width / 2 + lineWidth / 2, -height / 2 - lineWidth) // 右边虚线规避重叠规则
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r2 !== 0 && this.ctx.arc(width / 2 - r2, -height / 2 + r2, r2 + lineWidth / 2, 1.5 * Math.PI, 2 * Math.PI) // 右上角圆弧
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this.ctx.lineTo(width / 2 + lineWidth / 2, r3 === 0 ? (notSolid ? height / 2 : height / 2 + lineWidth / 2) : height / 2 - r3) // 右边线
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notSolid && r3 === 0 && this.ctx.moveTo(width / 2 + lineWidth, height / 2 + lineWidth / 2) // 底边虚线规避重叠规则
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r3 !== 0 && this.ctx.arc(width / 2 - r3, height / 2 - r3, r3 + lineWidth / 2, 0, 0.5 * Math.PI) // 右下角圆弧
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this.ctx.lineTo(r4 === 0 ? (notSolid ? -width / 2 : -width / 2 - lineWidth / 2) : -width / 2 + r4, height / 2 + lineWidth / 2) // 底边线
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notSolid && r4 === 0 && this.ctx.moveTo(-width / 2 - lineWidth / 2, height / 2 + lineWidth) // 左边虚线规避重叠规则
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r4 !== 0 && this.ctx.arc(-width / 2 + r4, height / 2 - r4, r4 + lineWidth / 2, 0.5 * Math.PI, 1 * Math.PI) // 左下角圆弧
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this.ctx.lineTo(-width / 2 - lineWidth / 2, r1 === 0 ? (notSolid ? -height / 2 : -height / 2 - lineWidth / 2) : -height / 2 + r1) // 左边线
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notSolid && r1 === 0 && this.ctx.moveTo(-width / 2 - lineWidth, -height / 2 - lineWidth / 2) // 顶边虚线规避重叠规则
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if (!notSolid) {
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this.ctx.closePath()
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}
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}
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/**
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* 根据 borderRadius 进行裁减
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*/
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_doClip(borderRadius, width, height, borderStyle) {
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if (borderRadius && width && height) {
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// 防止在某些机型上周边有黑框现象，此处如果直接设置 fillStyle 为透明，在 Android 机型上会导致被裁减的图片也变为透明， iOS 和 IDE 上不会
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// globalAlpha 在 1.9.90 起支持，低版本下无效，但把 fillStyle 设为了 white，相对默认的 black 要好点
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this.ctx.globalAlpha = 0
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this.ctx.fillStyle = 'white'
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this._border({
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borderRadius,
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width,
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height,
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borderStyle
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})
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this.ctx.fill()
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// 在 ios 的 6.6.6 版本上 clip 有 bug，禁掉此类型上的 clip，也就意味着，在此版本微信的 ios 设备下无法使用 border 属性
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this.ctx.clip()
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this.ctx.globalAlpha = 1
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}
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}
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/**
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* 画边框
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*/
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_doBorder(view, width, height) {
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if (!view.css) {
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return
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}
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const { borderRadius, borderWidth, borderColor, borderStyle } = view.css
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if (!borderWidth) {
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return
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}
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this.ctx.save()
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this._preProcess(view, true)
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this.ctx.strokeStyle = borderColor || 'black'
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this._border({
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borderRadius,
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width,
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height,
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borderWidth,
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borderStyle
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})
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this.ctx.stroke()
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this.ctx.restore()
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}
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_preProcess(view, notClip) {
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let width = 0
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let height
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let extra
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const paddings = this._doPaddings(view)
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switch (view.type) {
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case 'text': {
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const textArray = view.text.split('\n')
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// 处理多个连续的'\n'
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for (let i = 0; i < textArray.length; ++i) {
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if (textArray[i] === '') {
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textArray[i] = ' '
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}
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}
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// const fontWeight = view.css.fontWeight === 'bold' ? 'bold' : 'normal'
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const fontWeightArr = ['normal', 'bold', 'bolder', 'lighter', '100', '200', '300', '400', '500', '600', '700', '800', '900']
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const fontWeight = fontWeightArr.includes(view.css.fontWeight) ? view.css.fontWeight : 'normal'
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const textStyle = view.css.textStyle === 'italic' ? 'italic' : 'normal'
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let textIndent = view.css.textIndent ? view.css.textIndent.toPx() : 0
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if (!view.css.fontSize) {
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view.css.fontSize = '20rpx'
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}
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this.ctx.font = `${textStyle} ${fontWeight} ${view.css.fontSize.toPx()}px "${view.css.fontFamily || 'sans-serif'}"`
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// 计算行数
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let lines = 0
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const linesArray = []
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for (let i = 0; i < textArray.length; ++i) {
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const textLength = this.ctx.measureText(textArray[i]).width
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// 最小长度
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const minWidth = view.css.fontSize.toPx() + paddings[1] + paddings[3]
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let partWidth = view.css.width ? view.css.width.toPx(false, this.style.width) - paddings[1] - paddings[3] : textLength
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if (partWidth < minWidth) {
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partWidth = minWidth
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}
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// textIndent 最大为一行
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textIndent = textIndent > partWidth ? partWidth : textIndent
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const calLines = Math.ceil((textLength + textIndent) / partWidth)
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// 取最长的作为 width
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width = partWidth > width ? partWidth : width
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lines += calLines
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linesArray[i] = calLines
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}
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lines = view.css.maxLines < lines ? view.css.maxLines : lines
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const lineHeight = view.css.lineHeight ? view.css.lineHeight.toPx() : view.css.fontSize.toPx()
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height = lineHeight * lines
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extra = {
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textIndent,
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lines: lines,
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lineHeight: lineHeight,
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textArray: textArray,
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linesArray: linesArray
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}
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break
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}
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case 'image': {
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// 有css却未设置width或height，则默认为auto
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if (view.css) {
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if (!view.css.width) {
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view.css.width = 'auto'
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}
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if (!view.css.height) {
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view.css.height = 'auto'
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}
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}
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if (!view.css || (view.css.width === 'auto' && view.css.height === 'auto')) {
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width = Math.round(view.sWidth)
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height = Math.round(view.sHeight)
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} else if (view.css.width === 'auto') {
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height = view.css.height.toPx(false, this.style.height)
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width = (view.sWidth / view.sHeight) * height
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} else if (view.css.height === 'auto') {
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width = view.css.width.toPx(false, this.style.width)
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height = (view.sHeight / view.sWidth) * width
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} else {
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width = view.css.width.toPx(false, this.style.width)
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height = view.css.height.toPx(false, this.style.height)
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}
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break
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}
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default:
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if (!(view.css.width && view.css.height)) {
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console.error('You should set width and height')
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return
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}
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width = view.css.width.toPx(false, this.style.width)
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height = view.css.height.toPx(false, this.style.height)
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break
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}
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let x
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if (view.css && view.css.right) {
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if (typeof view.css.right === 'string') {
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x = this.style.width - view.css.right.toPx(true, this.style.width)
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} else {
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// 可以用数组方式，把文字长度计算进去
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// [right, 文字id, 乘数（默认 1）]
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const rights = view.css.right
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x = this.style.width - rights[0].toPx(true, this.style.width) - this.globalWidth[rights[1]] * (rights[2] || 1)
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}
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} else if (view.css && view.css.left) {
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if (typeof view.css.left === 'string') {
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x = view.css.left.toPx(true, this.style.width)
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} else {
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const lefts = view.css.left
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x = lefts[0].toPx(true, this.style.width) + this.globalWidth[lefts[1]] * (lefts[2] || 1)
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}
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} else {
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x = 0
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}
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//const y = view.css && view.css.bottom ? this.style.height - height - view.css.bottom.toPx(true) : (view.css && view.css.top ? view.css.top.toPx(true) : 0);
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let y
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if (view.css && view.css.bottom) {
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y = this.style.height - height - view.css.bottom.toPx(true, this.style.height)
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} else {
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if (view.css && view.css.top) {
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if (typeof view.css.top === 'string') {
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y = view.css.top.toPx(true, this.style.height)
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} else {
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const tops = view.css.top
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y = tops[0].toPx(true, this.style.height) + this.globalHeight[tops[1]] * (tops[2] || 1)
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}
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} else {
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y = 0
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}
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}
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const angle = view.css && view.css.rotate ? this._getAngle(view.css.rotate) : 0
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// 当设置了 right 时，默认 align 用 right，反之用 left
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const align = view.css && view.css.align ? view.css.align : view.css && view.css.right ? 'right' : 'left'
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const verticalAlign = view.css && view.css.verticalAlign ? view.css.verticalAlign : 'top'
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// 记录绘制时的画布
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let xa = 0
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switch (align) {
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case 'center':
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xa = x
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break
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case 'right':
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xa = x - width / 2
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break
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default:
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xa = x + width / 2
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break
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}
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let ya = 0
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switch (verticalAlign) {
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case 'center':
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ya = y
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break
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case 'bottom':
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ya = y - height / 2
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break
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default:
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ya = y + height / 2
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break
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}
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this.ctx.translate(xa, ya)
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// 记录该 view 的有效点击区域
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// TODO ，旋转和裁剪的判断
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// 记录在真实画布上的左侧
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let left = x
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if (align === 'center') {
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left = x - width / 2
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} else if (align === 'right') {
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left = x - width
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}
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var top = y
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if (verticalAlign === 'center') {
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top = y - height / 2
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} else if (verticalAlign === 'bottom') {
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top = y - height
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}
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if (view.rect) {
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view.rect.left = left
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view.rect.top = top
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view.rect.right = left + width
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view.rect.bottom = top + height
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view.rect.x = view.css && view.css.right ? x - width : x
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view.rect.y = y
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} else {
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view.rect = {
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left: left,
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top: top,
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right: left + width,
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bottom: top + height,
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x: view.css && view.css.right ? x - width : x,
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y: y
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}
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}
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view.rect.left = view.rect.left - paddings[3]
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view.rect.top = view.rect.top - paddings[0]
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view.rect.right = view.rect.right + paddings[1]
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view.rect.bottom = view.rect.bottom + paddings[2]
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if (view.type === 'text') {
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view.rect.minWidth = view.css.fontSize.toPx() + paddings[1] + paddings[3]
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}
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this.ctx.rotate(angle)
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if (!notClip && view.css && view.css.borderRadius && view.type !== 'rect') {
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this._doClip(view.css.borderRadius, width, height, view.css.borderStyle)
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}
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this._doShadow(view)
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if (view.id) {
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this.globalWidth[view.id] = width
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this.globalHeight[view.id] = height
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}
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return {
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width: width,
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height: height,
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x: x,
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y: y,
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extra: extra
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}
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}
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_doPaddings(view) {
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const { padding } = view.css ? view.css : {}
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let pd = [0, 0, 0, 0]
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if (padding) {
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const pdg = padding.split(/\s+/)
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if (pdg.length === 1) {
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const x = pdg[0].toPx()
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pd = [x, x, x, x]
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}
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if (pdg.length === 2) {
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const x = pdg[0].toPx()
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const y = pdg[1].toPx()
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pd = [x, y, x, y]
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}
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if (pdg.length === 3) {
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const x = pdg[0].toPx()
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const y = pdg[1].toPx()
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const z = pdg[2].toPx()
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pd = [x, y, z, y]
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}
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if (pdg.length === 4) {
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const x = pdg[0].toPx()
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const y = pdg[1].toPx()
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const z = pdg[2].toPx()
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const a = pdg[3].toPx()
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pd = [x, y, z, a]
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}
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}
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return pd
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}
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// 画文字的背景图片
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_doBackground(view) {
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this.ctx.save()
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const { width: rawWidth, height: rawHeight } = this._preProcess(view, true)
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const { background } = view.css
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let pd = this._doPaddings(view)
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const width = rawWidth + pd[1] + pd[3]
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const height = rawHeight + pd[0] + pd[2]
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this._doClip(view.css.borderRadius, width, height, view.css.borderStyle)
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if (GD.api.isGradient(background)) {
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GD.api.doGradient(background, width, height, this.ctx)
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} else {
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this.ctx.fillStyle = background
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}
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height)
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this.ctx.restore()
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}
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_drawQRCode(view) {
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this.ctx.save()
|
||
const { width, height } = this._preProcess(view)
|
||
QR.api.draw(view.content, this.ctx, -width / 2, -height / 2, width, height, view.css.background, view.css.color)
|
||
this.ctx.restore()
|
||
this._doBorder(view, width, height)
|
||
}
|
||
|
||
_drawAbsImage(view) {
|
||
if (!view.url) {
|
||
return
|
||
}
|
||
this.ctx.save()
|
||
const { width, height } = this._preProcess(view)
|
||
// 图片失败
|
||
if (typeof view.url === 'string') {
|
||
this.ctx.fillStyle = '#ddd'
|
||
this.ctx.fillRect(-(width / 2), -(height / 2), width, height)
|
||
this.ctx.restore()
|
||
return
|
||
}
|
||
// 获得缩放到图片大小级别的裁减框
|
||
let rWidth = view.sWidth
|
||
let rHeight = view.sHeight
|
||
let startX = 0
|
||
let startY = 0
|
||
// 绘画区域比例
|
||
const cp = width / height
|
||
// 原图比例
|
||
const op = view.sWidth / view.sHeight
|
||
if (cp >= op) {
|
||
rHeight = rWidth / cp
|
||
startY = Math.round((view.sHeight - rHeight) / 2)
|
||
} else {
|
||
rWidth = rHeight * cp
|
||
startX = Math.round((view.sWidth - rWidth) / 2)
|
||
}
|
||
if (view.css && view.css.mode === 'scaleToFill') {
|
||
this.ctx.drawImage(view.url, -(width / 2), -(height / 2), width, height)
|
||
} else {
|
||
this.ctx.drawImage(view.url, startX, startY, rWidth, rHeight, -(width / 2), -(height / 2), width, height)
|
||
view.rect.startX = startX / view.sWidth
|
||
view.rect.startY = startY / view.sHeight
|
||
view.rect.endX = (startX + rWidth) / view.sWidth
|
||
view.rect.endY = (startY + rHeight) / view.sHeight
|
||
}
|
||
this.ctx.restore()
|
||
this._doBorder(view, width, height)
|
||
}
|
||
|
||
_fillAbsText(view) {
|
||
if (!view.text) {
|
||
return
|
||
}
|
||
if (view.css.background) {
|
||
// 生成背景
|
||
this._doBackground(view)
|
||
}
|
||
this.ctx.save()
|
||
const { width, height, extra } = this._preProcess(view, view.css.background && view.css.borderRadius)
|
||
this.ctx.fillStyle = view.css.color || 'black'
|
||
const { lines, lineHeight, textArray, linesArray, textIndent } = extra
|
||
// 如果设置了id，则保留 text 的长度
|
||
if (view.id) {
|
||
let textWidth = 0
|
||
for (let i = 0; i < textArray.length; ++i) {
|
||
const _w = this.ctx.measureText(textArray[i]).width
|
||
textWidth = _w > textWidth ? _w : textWidth
|
||
}
|
||
this.globalWidth[view.id] = width ? (textWidth < width ? textWidth : width) : textWidth
|
||
}
|
||
let lineIndex = 0
|
||
let tabWidth = 0
|
||
for (let j = 0; j < textArray.length; ++j) {
|
||
const preLineLength = Math.ceil(textArray[j].length / linesArray[j])
|
||
const firstLineLength = Math.ceil(((width - textIndent) / width) * (textArray[j].length / linesArray[j]))
|
||
let start = 0
|
||
let alreadyCount = 0
|
||
|
||
for (let i = 0; i < linesArray[j]; ++i) {
|
||
// 绘制行数大于最大行数，则直接跳出循环
|
||
if (lineIndex >= lines) {
|
||
break
|
||
}
|
||
tabWidth = i == 0 ? textIndent : 0
|
||
alreadyCount = i == 0 ? firstLineLength : preLineLength
|
||
let text = textArray[j].substr(start, alreadyCount)
|
||
let measuredWith = this.ctx.measureText(text).width
|
||
// 如果测量大小小于width一个字符的大小，则进行补齐，如果测量大小超出 width，则进行减除
|
||
// 如果已经到文本末尾，也不要进行该循环
|
||
while (start + alreadyCount <= textArray[j].length && (width - measuredWith - tabWidth > view.css.fontSize.toPx() || measuredWith - width > view.css.fontSize.toPx())) {
|
||
if (measuredWith < width) {
|
||
text = textArray[j].substr(start, ++alreadyCount)
|
||
} else {
|
||
if (text.length <= 1) {
|
||
// 如果只有一个字符时，直接跳出循环
|
||
break
|
||
}
|
||
text = textArray[j].substr(start, --alreadyCount)
|
||
// break
|
||
}
|
||
measuredWith = this.ctx.measureText(text).width
|
||
}
|
||
start += text.length
|
||
// 如果是最后一行了，发现还有未绘制完的内容，则加...
|
||
if (lineIndex === lines - 1 && (j < textArray.length - 1 || start < textArray[j].length)) {
|
||
while (this.ctx.measureText(`${text}...`).width > width) {
|
||
if (text.length <= 1) {
|
||
// 如果只有一个字符时，直接跳出循环
|
||
break
|
||
}
|
||
text = text.substring(0, text.length - 1)
|
||
}
|
||
text += '...'
|
||
measuredWith = this.ctx.measureText(text).width
|
||
}
|
||
this.ctx.textAlign = view.css.textAlign ? view.css.textAlign : 'left'
|
||
let x
|
||
let lineX
|
||
switch (view.css.textAlign) {
|
||
case 'center':
|
||
x = 0
|
||
lineX = x - measuredWith / 2 + tabWidth
|
||
break
|
||
case 'right':
|
||
x = width / 2
|
||
lineX = x - measuredWith + tabWidth
|
||
break
|
||
default:
|
||
x = -(width / 2) + tabWidth
|
||
lineX = x
|
||
break
|
||
}
|
||
const y = -(height / 2) + (lineIndex === 0 ? view.css.fontSize.toPx() : view.css.fontSize.toPx() + lineIndex * lineHeight)
|
||
lineIndex++
|
||
if (view.css.textStyle === 'stroke') {
|
||
this.ctx.strokeText(text, x, y, measuredWith)
|
||
} else {
|
||
this.ctx.fillText(text, x, y, measuredWith)
|
||
}
|
||
const fontSize = view.css.fontSize.toPx()
|
||
if (view.css.textDecoration) {
|
||
this.ctx.lineWidth = fontSize / 13
|
||
this.ctx.beginPath()
|
||
if (/\bunderline\b/.test(view.css.textDecoration)) {
|
||
this.ctx.moveTo(lineX, y)
|
||
this.ctx.lineTo(lineX + measuredWith, y)
|
||
}
|
||
if (/\boverline\b/.test(view.css.textDecoration)) {
|
||
this.ctx.moveTo(lineX, y - fontSize)
|
||
this.ctx.lineTo(lineX + measuredWith, y - fontSize)
|
||
}
|
||
if (/\bline-through\b/.test(view.css.textDecoration)) {
|
||
this.ctx.moveTo(lineX, y - fontSize / 3)
|
||
this.ctx.lineTo(lineX + measuredWith, y - fontSize / 3)
|
||
}
|
||
this.ctx.closePath()
|
||
this.ctx.strokeStyle = view.css.color
|
||
this.ctx.stroke()
|
||
}
|
||
}
|
||
}
|
||
this.ctx.restore()
|
||
this._doBorder(view, width, height)
|
||
}
|
||
|
||
_drawAbsRect(view) {
|
||
this.ctx.save()
|
||
const { width, height } = this._preProcess(view)
|
||
if (GD.api.isGradient(view.css.color)) {
|
||
GD.api.doGradient(view.css.color, width, height, this.ctx)
|
||
} else {
|
||
this.ctx.fillStyle = view.css.color
|
||
}
|
||
const { borderRadius, borderStyle, borderWidth } = view.css
|
||
this._border({
|
||
borderRadius,
|
||
width,
|
||
height,
|
||
borderWidth,
|
||
borderStyle
|
||
})
|
||
this.ctx.fill()
|
||
this.ctx.restore()
|
||
this._doBorder(view, width, height)
|
||
}
|
||
|
||
// shadow 支持 (x, y, blur, color), 不支持 spread
|
||
// shadow:0px 0px 10px rgba(0,0,0,0.1);
|
||
_doShadow(view) {
|
||
if (!view.css || !view.css.shadow) {
|
||
return
|
||
}
|
||
const box = view.css.shadow.replace(/,\s+/g, ',').split(/\s+/)
|
||
if (box.length > 4) {
|
||
console.error("shadow don't spread option")
|
||
return
|
||
}
|
||
this.ctx.shadowOffsetX = parseInt(box[0], 10)
|
||
this.ctx.shadowOffsetY = parseInt(box[1], 10)
|
||
this.ctx.shadowBlur = parseInt(box[2], 10)
|
||
this.ctx.shadowColor = box[3]
|
||
}
|
||
|
||
_getAngle(angle) {
|
||
return (Number(angle) * Math.PI) / 180
|
||
}
|
||
}
|