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@@ -0,0 +1,544 @@
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+const app = getApp();
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+const util = require("../../../util/util.js")
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+
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+Page({
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+ /**
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+ * 页面的初始数据
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+ */
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+ data: {
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+ canvasName: 'handWriting',
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+ ctx: '',
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+ canvasWidth: 0,
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+ canvasHeight: 0,
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+ transparent: 1, // 透明度
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+ selectColor: 'black',
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+ lineColor: '#1A1A1A', // 颜色
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+ lineSize: 1.5, // 笔记倍数
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+ lineMin: 0.5, // 最小笔画半径
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+ lineMax: 4, // 最大笔画半径
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+ pressure: 1, // 默认压力
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+ smoothness: 60, //顺滑度,用60的距离来计算速度
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+ currentPoint: {},
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+ currentLine: [], // 当前线条
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+ firstTouch: true, // 第一次触发
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+ radius: 1, //画圆的半径
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+ cutArea: {
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+ top: 0,
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+ right: 0,
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+ bottom: 0,
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+ left: 0
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+ }, //裁剪区域
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+ bethelPoint: [], //保存所有线条 生成的贝塞尔点;
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+ lastPoint: 0,
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+ chirography: [], //笔迹
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+ currentChirography: {}, //当前笔迹
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+ linePrack: [] //划线轨迹 , 生成线条的实际点
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+ },
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+
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+ /*======所有自定义函数======*/
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+
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+ // 笔迹开始
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+ uploadScaleStart(e) {
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+ if (e.type != 'touchstart') return false;
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+ let ctx = this.data.ctx;
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+ ctx.setFillStyle(this.data.lineColor); // 初始线条设置颜色
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+ ctx.setGlobalAlpha(this.data.transparent); // 设置半透明
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+ let currentPoint = {
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+ x: e.touches[0].x,
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+ y: e.touches[0].y
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+ }
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+ let currentLine = this.data.currentLine;
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+ currentLine.unshift({
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+ time: new Date().getTime(),
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+ dis: 0,
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+ x: currentPoint.x,
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+ y: currentPoint.y
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+ })
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+ this.setData({
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+ currentPoint,
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+ // currentLine
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+ })
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+ if (this.data.firstTouch) {
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+ this.setData({
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+ cutArea: {
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+ top: currentPoint.y,
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+ right: currentPoint.x,
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+ bottom: currentPoint.y,
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+ left: currentPoint.x
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+ },
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+ firstTouch: false
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+ })
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+ }
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+ this.pointToLine(currentLine);
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+ },
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+ // 笔迹移动
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+ uploadScaleMove(e) {
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+ if (e.type != 'touchmove') return false;
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+ if (e.cancelable) {
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+ // 判断默认行为是否已经被禁用
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+ if (!e.defaultPrevented) {
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+ e.preventDefault();
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+ }
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+ }
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+ let point = {
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+ x: e.touches[0].x,
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+ y: e.touches[0].y
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+ }
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+
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+ //测试裁剪
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+ if (point.y < this.data.cutArea.top) {
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+ this.data.cutArea.top = point.y;
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+ }
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+ if (point.y < 0) this.data.cutArea.top = 0;
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+
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+ if (point.x > this.data.cutArea.right) {
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+ this.data.cutArea.right = point.x;
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+ }
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+ if (this.data.canvasWidth - point.x <= 0) {
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+ this.data.cutArea.right = this.data.canvasWidth;
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+ }
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+ if (point.y > this.data.cutArea.bottom) {
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+ this.data.cutArea.bottom = point.y;
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+ }
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+ if (this.data.canvasHeight - point.y <= 0) {
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+ this.data.cutArea.bottom = this.data.canvasHeight;
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+ }
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+ if (point.x < this.data.cutArea.left) {
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+ this.data.cutArea.left = point.x;
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+ }
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+ if (point.x < 0) this.data.cutArea.left = 0;
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+
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+ this.setData({
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+ lastPoint: this.data.currentPoint,
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+ currentPoint: point
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+ })
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+ let currentLine = this.data.currentLine
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+ currentLine.unshift({
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+ time: new Date().getTime(),
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+ dis: this.distance(this.data.currentPoint, this.data.lastPoint),
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+ x: point.x,
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+ y: point.y
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+ })
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+ // this.setData({
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+ // currentLine
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+ // })
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+ this.pointToLine(currentLine);
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+ },
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+ // 笔迹结束
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+ uploadScaleEnd(e) {
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+ if (e.type != 'touchend') return 0;
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+ let point = {
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+ x: e.changedTouches[0].x,
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+ y: e.changedTouches[0].y
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+ }
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+ this.setData({
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+ lastPoint: this.data.currentPoint,
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+ currentPoint: point
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+ })
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+ let currentLine = this.data.currentLine
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+ currentLine.unshift({
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+ time: new Date().getTime(),
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+ dis: this.distance(this.data.currentPoint, this.data.lastPoint),
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+ x: point.x,
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+ y: point.y
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+ })
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+ if (currentLine.length > 2) {
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+ var info = (currentLine[0].time - currentLine[currentLine.length - 1].time) / currentLine.length;
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+ //$("#info").text(info.toFixed(2));
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+ }
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+ //一笔结束,保存笔迹的坐标点,清空,当前笔迹
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+ //增加判断是否在手写区域;
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+ this.pointToLine(currentLine);
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+ var currentChirography = {
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+ lineSize: this.data.lineSize,
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+ lineColor: this.data.lineColor
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+ };
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+ var chirography = this.data.chirography
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+ chirography.unshift(currentChirography);
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+ this.setData({
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+ chirography
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+ })
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+ var linePrack = this.data.linePrack
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+ linePrack.unshift(this.data.currentLine);
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+ this.setData({
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+ linePrack,
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+ currentLine: []
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+ })
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+ },
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+
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+ retDraw() {
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+ this.data.ctx.clearRect(0, 0, 700, 730)
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+ this.data.ctx.draw();
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+
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+ //设置canvas背景
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+ this.setCanvasBg("#fff");
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+ },
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+
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+ //画两点之间的线条;参数为:line,会绘制最近的开始的两个点;
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+ pointToLine(line) {
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+ this.calcBethelLine(line);
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+ return;
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+ },
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+ //计算插值的方式;
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+ calcBethelLine(line) {
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+ if (line.length <= 1) {
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+ line[0].r = this.data.radius;
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+ return;
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+ }
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+ let x0, x1, x2, y0, y1, y2, r0, r1, r2, len, lastRadius, dis = 0,
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+ time = 0,
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+ curveValue = 0.5;
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+ if (line.length <= 2) {
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+ x0 = line[1].x
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+ y0 = line[1].y
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+ x2 = line[1].x + (line[0].x - line[1].x) * curveValue;
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+ y2 = line[1].y + (line[0].y - line[1].y) * curveValue;
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+ //x2 = line[1].x;
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+ //y2 = line[1].y;
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+ x1 = x0 + (x2 - x0) * curveValue;
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+ y1 = y0 + (y2 - y0) * curveValue;;
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+
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+ } else {
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+ x0 = line[2].x + (line[1].x - line[2].x) * curveValue;
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+ y0 = line[2].y + (line[1].y - line[2].y) * curveValue;
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+ x1 = line[1].x;
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+ y1 = line[1].y;
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+ x2 = x1 + (line[0].x - x1) * curveValue;
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+ y2 = y1 + (line[0].y - y1) * curveValue;
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+ }
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+ //从计算公式看,三个点分别是(x0,y0),(x1,y1),(x2,y2) ;(x1,y1)这个是控制点,控制点不会落在曲线上;实际上,这个点还会手写获取的实际点,却落在曲线上
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+ len = this.distance({
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+ x: x2,
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+ y: y2
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+ }, {
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+ x: x0,
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+ y: y0
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+ });
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+ lastRadius = this.data.radius;
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+ for (let n = 0; n < line.length - 1; n++) {
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+ dis += line[n].dis;
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+ time += line[n].time - line[n + 1].time;
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+ if (dis > this.data.smoothness) break;
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+ }
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+ this.setData({
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+ radius: Math.min(time / len * this.data.pressure + this.data.lineMin, this.data.lineMax) * this.data.lineSize
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+ });
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+ line[0].r = this.data.radius;
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+ //计算笔迹半径;
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+ if (line.length <= 2) {
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+ r0 = (lastRadius + this.data.radius) / 2;
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+ r1 = r0;
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+ r2 = r1;
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+ //return;
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+ } else {
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+ r0 = (line[2].r + line[1].r) / 2;
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+ r1 = line[1].r;
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+ r2 = (line[1].r + line[0].r) / 2;
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+ }
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+ let n = 5;
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+ let point = [];
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+ for (let i = 0; i < n; i++) {
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+ let t = i / (n - 1);
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+ let x = (1 - t) * (1 - t) * x0 + 2 * t * (1 - t) * x1 + t * t * x2;
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+ let y = (1 - t) * (1 - t) * y0 + 2 * t * (1 - t) * y1 + t * t * y2;
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+ let r = lastRadius + (this.data.radius - lastRadius) / n * i;
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+ point.push({
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+ x: x,
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+ y: y,
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+ r: r
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+ });
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+ if (point.length == 3) {
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+ let a = this.ctaCalc(point[0].x, point[0].y, point[0].r, point[1].x, point[1].y, point[1].r, point[2].x, point[2].y, point[2].r);
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+ a[0].color = this.data.lineColor;
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+ // let bethelPoint = this.data.bethelPoint;
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+ // console.log(a)
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+ // console.log(this.data.bethelPoint)
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+ // bethelPoint = bethelPoint.push(a);
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+ this.bethelDraw(a, 1);
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+ point = [{
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+ x: x,
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+ y: y,
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+ r: r
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+ }];
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+ }
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+ }
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+ this.setData({
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+ currentLine: line
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+ })
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+ },
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+ //求两点之间距离
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+ distance(a, b) {
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+ let x = b.x - a.x;
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+ let y = b.y - a.y;
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+ return Math.sqrt(x * x + y * y);
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+ },
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+ ctaCalc(x0, y0, r0, x1, y1, r1, x2, y2, r2) {
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+ let a = [],
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+ vx01, vy01, norm, n_x0, n_y0, vx21, vy21, n_x2, n_y2;
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+ vx01 = x1 - x0;
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+ vy01 = y1 - y0;
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+ norm = Math.sqrt(vx01 * vx01 + vy01 * vy01 + 0.0001) * 2;
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+ vx01 = vx01 / norm * r0;
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+ vy01 = vy01 / norm * r0;
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+ n_x0 = vy01;
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+ n_y0 = -vx01;
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+ vx21 = x1 - x2;
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+ vy21 = y1 - y2;
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+ norm = Math.sqrt(vx21 * vx21 + vy21 * vy21 + 0.0001) * 2;
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+ vx21 = vx21 / norm * r2;
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+ vy21 = vy21 / norm * r2;
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+ n_x2 = -vy21;
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+ n_y2 = vx21;
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+ a.push({
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+ mx: x0 + n_x0,
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+ my: y0 + n_y0,
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+ color: "#1A1A1A"
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+ });
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+ a.push({
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+ c1x: x1 + n_x0,
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+ c1y: y1 + n_y0,
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+ c2x: x1 + n_x2,
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+ c2y: y1 + n_y2,
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+ ex: x2 + n_x2,
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+ ey: y2 + n_y2
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+ });
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+ a.push({
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+ c1x: x2 + n_x2 - vx21,
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+ c1y: y2 + n_y2 - vy21,
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+ c2x: x2 - n_x2 - vx21,
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+ c2y: y2 - n_y2 - vy21,
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+ ex: x2 - n_x2,
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+ ey: y2 - n_y2
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+ });
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+ a.push({
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+ c1x: x1 - n_x2,
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+ c1y: y1 - n_y2,
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+ c2x: x1 - n_x0,
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+ c2y: y1 - n_y0,
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+ ex: x0 - n_x0,
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+ ey: y0 - n_y0
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+ });
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+ a.push({
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+ c1x: x0 - n_x0 - vx01,
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+ c1y: y0 - n_y0 - vy01,
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+ c2x: x0 + n_x0 - vx01,
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+ c2y: y0 + n_y0 - vy01,
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+ ex: x0 + n_x0,
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+ ey: y0 + n_y0
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+ });
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+ a[0].mx = a[0].mx.toFixed(1);
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+ a[0].mx = parseFloat(a[0].mx);
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+ a[0].my = a[0].my.toFixed(1);
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+ a[0].my = parseFloat(a[0].my);
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+ for (let i = 1; i < a.length; i++) {
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+ a[i].c1x = a[i].c1x.toFixed(1);
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+ a[i].c1x = parseFloat(a[i].c1x);
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+ a[i].c1y = a[i].c1y.toFixed(1);
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+ a[i].c1y = parseFloat(a[i].c1y);
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+ a[i].c2x = a[i].c2x.toFixed(1);
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+ a[i].c2x = parseFloat(a[i].c2x);
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+ a[i].c2y = a[i].c2y.toFixed(1);
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+ a[i].c2y = parseFloat(a[i].c2y);
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+ a[i].ex = a[i].ex.toFixed(1);
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+ a[i].ex = parseFloat(a[i].ex);
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+ a[i].ey = a[i].ey.toFixed(1);
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+ a[i].ey = parseFloat(a[i].ey);
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+ }
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+ return a;
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+ },
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+ bethelDraw(point, is_fill, color) {
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+ let ctx = this.data.ctx;
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+ ctx.beginPath();
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+ ctx.moveTo(point[0].mx, point[0].my);
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+ if (undefined != color) {
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+ ctx.setFillStyle(color);
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+ ctx.setStrokeStyle(color);
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+ } else {
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+ ctx.setFillStyle(point[0].color);
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+ ctx.setStrokeStyle(point[0].color);
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+ }
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+ for (let i = 1; i < point.length; i++) {
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+ ctx.bezierCurveTo(point[i].c1x, point[i].c1y, point[i].c2x, point[i].c2y, point[i].ex, point[i].ey);
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+ }
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+ ctx.stroke();
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+ if (undefined != is_fill) {
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+ ctx.fill(); //填充图形 ( 后绘制的图形会覆盖前面的图形, 绘制时注意先后顺序 )
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+ }
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+ ctx.draw(true)
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+ },
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+ selectColorEvent(event) {
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+ console.log(event)
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+ var color = event.currentTarget.dataset.colorValue;
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+ var colorSelected = event.currentTarget.dataset.color;
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|
|
+ this.setData({
|
|
|
+ selectColor: colorSelected,
|
|
|
+ lineColor: color
|
|
|
+ })
|
|
|
+ },
|
|
|
+
|
|
|
+ //将Canvas内容转成 临时图片 --> cb 为回调函数 形参 tempImgPath 为 生成的图片临时路径
|
|
|
+ canvasToImg(cb) { //这种写法移动端 出不来
|
|
|
+
|
|
|
+ this.data.ctx.draw(true, () => {
|
|
|
+ wx.canvasToTempFilePath({
|
|
|
+ canvasId: 'handWriting',
|
|
|
+ fileType: 'png',
|
|
|
+ quality: 1, //图片质量
|
|
|
+ success(res) {
|
|
|
+ // console.log(res.tempFilePath, 'canvas生成图片地址');
|
|
|
+
|
|
|
+ wx.showToast({
|
|
|
+ title: '执行了吗?',
|
|
|
+ })
|
|
|
+
|
|
|
+ cb(res.tempFilePath);
|
|
|
+ }
|
|
|
+
|
|
|
+ })
|
|
|
+ });
|
|
|
+
|
|
|
+
|
|
|
+ },
|
|
|
+ doSaveServer( err, {url} ){
|
|
|
+ let method='/maker/addContractImg';
|
|
|
+ util.http( method, {url}, (err,res)=>{
|
|
|
+ if( err!= 0 ) return;
|
|
|
+ util.showSuccess("合同签约成功")
|
|
|
+ })
|
|
|
+ },
|
|
|
+ //完成
|
|
|
+ subCanvas() {
|
|
|
+ wx.canvasToTempFilePath({
|
|
|
+ canvasId: 'handWriting',
|
|
|
+ fileType: 'jpg',
|
|
|
+ quality: 1, //图片质量
|
|
|
+ success: (res)=> {
|
|
|
+ util.uploadFile(res.tempFilePath, this.doSaveServer)
|
|
|
+ }
|
|
|
+ })
|
|
|
+ },
|
|
|
+ //保存到相册
|
|
|
+ saveCanvasAsImg() {
|
|
|
+ wx.canvasToTempFilePath({
|
|
|
+ canvasId: 'handWriting',
|
|
|
+ fileType: 'png',
|
|
|
+ quality: 1, //图片质量
|
|
|
+ success(res) {
|
|
|
+ wx.saveImageToPhotosAlbum({
|
|
|
+ filePath: res.tempFilePath,
|
|
|
+ success(res) {
|
|
|
+ wx.showToast({
|
|
|
+ title: '已保存到相册',
|
|
|
+ duration: 2000
|
|
|
+ });
|
|
|
+ }
|
|
|
+ })
|
|
|
+ }
|
|
|
+ })
|
|
|
+ },
|
|
|
+ //预览
|
|
|
+ previewCanvasImg() {
|
|
|
+ wx.canvasToTempFilePath({
|
|
|
+ canvasId: 'handWriting',
|
|
|
+ fileType: 'jpg',
|
|
|
+ quality: 1, //图片质量
|
|
|
+ success(res) {
|
|
|
+ wx.previewImage({
|
|
|
+ urls: [res.tempFilePath], //预览图片 数组
|
|
|
+ })
|
|
|
+ }
|
|
|
+ })
|
|
|
+ },
|
|
|
+
|
|
|
+ //设置canvas背景色 不设置 导出的canvas的背景为透明
|
|
|
+ //@params:字符串 color
|
|
|
+ setCanvasBg(color) {
|
|
|
+ /* 将canvas背景设置为 白底,不设置 导出的canvas的背景为透明 */
|
|
|
+ //rect() 参数说明 矩形路径左上角的横坐标,左上角的纵坐标, 矩形路径的宽度, 矩形路径的高度
|
|
|
+ //这里是 canvasHeight - 4 是因为下边盖住边框了,所以手动减了写
|
|
|
+ this.data.ctx.rect(0, 0, this.data.canvasWidth, this.data.canvasHeight - 4);
|
|
|
+ // ctx.setFillStyle('red')
|
|
|
+ this.data.ctx.setFillStyle(color)
|
|
|
+ this.data.ctx.fill() //设置填充
|
|
|
+ this.data.ctx.draw() //开画
|
|
|
+ },
|
|
|
+ /*======所有自定义函数=END=====*/
|
|
|
+ /**
|
|
|
+ * 生命周期函数--监听页面加载
|
|
|
+ */
|
|
|
+ onLoad: function (options) {
|
|
|
+ let canvasName = this.data.canvasName
|
|
|
+ let ctx = wx.createCanvasContext(canvasName)
|
|
|
+ this.setData({
|
|
|
+ ctx: ctx
|
|
|
+ })
|
|
|
+ var query = wx.createSelectorQuery();
|
|
|
+ query.select('.handCenter').boundingClientRect(rect => {
|
|
|
+ this.setData({
|
|
|
+ canvasWidth: rect.width,
|
|
|
+ canvasHeight: rect.height
|
|
|
+ })
|
|
|
+ /* 将canvas背景设置为 白底,不设置 导出的canvas的背景为透明 */
|
|
|
+ this.setCanvasBg('#fff');
|
|
|
+ }).exec();
|
|
|
+ },
|
|
|
+ goBack(){
|
|
|
+ wx.navigateBack({
|
|
|
+ delta: 1,
|
|
|
+ })
|
|
|
+ },
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 生命周期函数--监听页面初次渲染完成
|
|
|
+ */
|
|
|
+ onReady: function () {
|
|
|
+
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 生命周期函数--监听页面显示
|
|
|
+ */
|
|
|
+ onShow: function () {
|
|
|
+
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 生命周期函数--监听页面隐藏
|
|
|
+ */
|
|
|
+ onHide: function () {
|
|
|
+
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 生命周期函数--监听页面卸载
|
|
|
+ */
|
|
|
+ onUnload: function () {
|
|
|
+
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 页面相关事件处理函数--监听用户下拉动作
|
|
|
+ */
|
|
|
+ onPullDownRefresh: function () {
|
|
|
+
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 页面上拉触底事件的处理函数
|
|
|
+ */
|
|
|
+ onReachBottom: function () {
|
|
|
+
|
|
|
+ },
|
|
|
+
|
|
|
+ /**
|
|
|
+ * 用户点击右上角分享
|
|
|
+ */
|
|
|
+ onShareAppMessage: function () {
|
|
|
+
|
|
|
+ }
|
|
|
+})
|