Merge branch 'master' of https://github.com/Kujiale-Mobile/Painter

lib/gradient.js

@@ -0,0 +1,102 @@
+/* eslint-disable */
+// 当ctx传入当前文件，const grd = ctx.createCircularGradient() 和 
+// const grd = this.ctx.createLinearGradient() 无效，因此只能分开处理
+// 先分析，在外部创建grd，再传入使用就可以
+
+!(function () {
+
+  var api = {
+    isGradient: function(bg) {
+      if (bg.startsWith('linear') || bg.startsWith('radial')) {
+        return true;
+      } 
+      return false;
+    },
+
+    doGradient: function(bg, width, height, ctx) {
+      if (bg.startsWith('linear')) {
+        linearEffect(width, height, bg, ctx);
+      } else if (bg.startsWith('radial')) {
+        radialEffect(width, height, bg, ctx);
+      }
+    },
+  }
+
+  function analizeGrad(string) {
+    const colorPercents = string.substring(0, string.length - 1).split("%,");
+    const colors = [];
+    const percents = [];
+    for (let colorPercent of colorPercents) {
+      colors.push(colorPercent.substring(0, colorPercent.lastIndexOf(" ")).trim());
+      percents.push(colorPercent.substring(colorPercent.lastIndexOf(" "), colorPercent.length) / 100);
+    }
+    return {colors: colors, percents: percents};
+  }
+
+  function radialEffect(width, height, bg, ctx) {
+    const colorPer = analizeGrad(bg.match(/radial-gradient\((.+)\)/)[1]);
+    const grd = ctx.createCircularGradient(0, 0, width < height ? height / 2 : width / 2);
+    for (let i = 0; i < colorPer.colors.length; i++) {
+      grd.addColorStop(colorPer.percents[i], colorPer.colors[i]);
+    }
+    ctx.setFillStyle(grd);
+    ctx.fillRect(-(width / 2), -(height / 2), width, height);
+  }
+
+  function analizeLinear(bg, width, height) {
+    const direction = bg.match(/([-]?\d{1,3})deg/);
+    const dir = direction && direction[1] ? parseFloat(direction[1]) : 0;
+    let coordinate;
+    switch (dir) {
+      case 0: console.log('case 0:'); coordinate = [0, -height / 2, 0, height / 2]; break;
+      case 90: console.log('case 90:'); coordinate = [width / 2, 0, -width / 2, 0]; break;
+      case -90: console.log('case -90:'); coordinate = [-width / 2, 0, width / 2, 0]; break;
+      case 180: console.log('case 180:'); coordinate = [0, height / 2, 0, -height / 2]; break;
+      case -180: console.log('case -180:'); coordinate = [0, -height / 2, 0, height / 2]; break;
+      default:
+        let x1 = 0;
+        let y1 = 0;
+        let x2 = 0;
+        let y2 = 0;
+        if (direction[1] > 0 && direction[1] < 90) {
+          x1 = (width / 2) - ((width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
+          y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
+          x2 = -x1;
+          y1 = -y2;
+        } else if (direction[1] > -180 && direction[1] < -90) {
+          x1 = -(width / 2) + ((width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
+          y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
+          x2 = -x1;
+          y1 = -y2;
+        } else if (direction[1] > 90 && direction[1] < 180) {
+          x1 = (width / 2) + (-(width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
+          y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
+          x2 = -x1;
+          y1 = -y2;
+        } else {
+          x1 = -(width / 2) - (-(width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
+          y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
+          x2 = -x1;
+          y1 = -y2;
+        }
+        coordinate = [x1, y1, x2, y2];
+      break;
+    }
+    return coordinate;
+  }
+
+  function linearEffect(width, height, bg, ctx) {
+    const param = analizeLinear(bg, width, height);
+    const grd = ctx.createLinearGradient(param[0], param[1], param[2], param[3]);
+    const content = bg.match(/linear-gradient\((.+)\)/)[1];
+    const colorPer = analizeGrad(content.substring(content.indexOf(',') + 1));
+    for (let i = 0; i < colorPer.colors.length; i++) {
+      grd.addColorStop(colorPer.percents[i], colorPer.colors[i]);
+    }
+    ctx.setFillStyle(grd);
+    ctx.fillRect(-(width / 2), -(height / 2), width, height);
+  }
+
+  module.exports = { api }
+
+})();

lib/pen.js

@@ -1,4 +1,5 @@
 const QR = require('./qrcode.js');
+const GD = require('./gradient.js');
 
 export default class Painter {
   constructor(ctx, data) {
@@ -38,6 +39,8 @@ export default class Painter {
       // 背景填充颜色
       this.ctx.setFillStyle(bg);
       this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
+    } else if (GD.api.isGradient(bg)) {
+      GD.api.doGradient(bg, width, height, this.ctx);
     } else {
       // 背景填充图片
       this.ctx.drawImage(bg, -(width / 2), -(height / 2), width, height);
@@ -346,7 +349,11 @@ export default class Painter {
       width,
       height,
     } = this._preProcess(view);
-    this.ctx.setFillStyle(view.css.color);
+    if (GD.api.isGradient(view.css.color)) {
+      GD.api.doGradient(view.css.color, width, height, this.ctx);
+    } else {
+      this.ctx.setFillStyle(view.css.color);
+    }
     this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
     this.ctx.restore();
     this._doBorder(view, width, height);