333 lines
11 KiB
JavaScript
333 lines
11 KiB
JavaScript
import _regeneratorRuntime from "@babel/runtime/helpers/esm/regeneratorRuntime";
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import _asyncToGenerator from "@babel/runtime/helpers/esm/asyncToGenerator";
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//@ts-nocheck
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import { set, getOuterWidth, getOuterHeight } from 'rc-util/lib/Dom/css';
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import { isNil, isString, isFunction, cloneDeep } from '@zhst/func';
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import { dispatchEvent } from "../utils";
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import { EVENT_VIEWER_TRANSFORM_CHANGE } from "./constants";
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export default {
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// store
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image: null,
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canvas: null,
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containerData: {
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width: 0,
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height: 0
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},
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animationFrame: null,
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backgroundColor: '#fff',
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targetTransform: {
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translateX: 0,
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translateY: 0,
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scale: 0,
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rotate: 0
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// rotate: 90,
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},
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//method
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render: function render() {
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var _this = this;
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return _asyncToGenerator( /*#__PURE__*/_regeneratorRuntime().mark(function _callee() {
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return _regeneratorRuntime().wrap(function _callee$(_context) {
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while (1) switch (_context.prev = _context.next) {
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case 0:
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_context.next = 2;
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return _this.initImg();
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case 2:
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_this.initCanvas();
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_this.startRaf();
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case 4:
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case "end":
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return _context.stop();
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}
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}, _callee);
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}))();
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},
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initImg: function initImg() {
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var _this2 = this;
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return new Promise(function (resolve, reject) {
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var propImage = _this2.options.image;
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if (isString(propImage)) {
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var image = new Image();
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image.crossOrigin = 'anonymous';
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image.src = propImage;
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image.onload = function () {
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_this2.image = image;
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resolve(image);
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};
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image.onerror = function (err) {
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reject(err);
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};
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} else {
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_this2.image = propImage;
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resolve(propImage);
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}
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});
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},
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initCanvas: function initCanvas() {
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//通过样式设置 不依赖父元素的prosition
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var element = this.element,
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canvas = this.canvas,
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_this$limit = this.limit,
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limit = _this$limit === void 0 ? {} : _this$limit,
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options = this.options;
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var containerData = {
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width: getOuterWidth(element),
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height: getOuterHeight(element)
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};
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this.containerData = containerData;
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set(canvas, containerData);
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canvas.width = containerData.width;
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canvas.height = containerData.height;
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var fitTransform = this.calcFitScreen();
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this.targetTransform = Object.assign({}, this.targetTransform, fitTransform);
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dispatchEvent(this.element, EVENT_VIEWER_TRANSFORM_CHANGE, cloneDeep(this.targetTransform));
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//产品需求：fitscale 是 minscale
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var _options$fitScaleAsMi = options.fitScaleAsMinScale,
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fitScaleAsMinScale = _options$fitScaleAsMi === void 0 ? false : _options$fitScaleAsMi;
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if (fitScaleAsMinScale) {
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this.limit = Object.assign({
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minScale: this.targetTransform.scale
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}, this.limit);
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}
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},
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startRaf: function startRaf() {
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var _this3 = this;
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//清理动画
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window.cancelAnimationFrame(this.animationFrame);
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//渲染
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var loop = function loop() {
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// this.update(); //先update
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_this3.renderCanvas();
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window.cancelAnimationFrame(_this3.animationFrame);
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_this3.animationFrame = window.requestAnimationFrame(loop);
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};
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loop();
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},
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// 绘制画布
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renderCanvas: function renderCanvas(_ctx) {
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if (!this.canvas) return;
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var containerData = this.containerData,
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canvas = this.canvas,
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targetTransform = this.targetTransform,
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options = this.options;
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var translateX = targetTransform.translateX,
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translateY = targetTransform.translateY,
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scale = targetTransform.scale,
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rotate = targetTransform.rotate;
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var ctx = _ctx ? _ctx : canvas.getContext('2d');
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//画背景
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ctx.clearRect(0, 0, containerData.width, containerData.height);
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ctx.fillStyle = options.backgroundColor; //todo@wdy OD框背景颜色
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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//画图
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ctx.save();
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//缩放移动
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ctx.setTransform(scale, 0, 0, scale, translateX, translateY);
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// ctx.setTransform(scale, 0, 0, scale, translateX, translateY);
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//旋转
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var centerX = this.image ? this.image.width / 2 : canvas.width;
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var centerY = this.image ? this.image.height / 2 : canvas.height;
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ctx.translate(centerX, centerY);
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ctx.rotate(rotate / 180 * Math.PI);
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ctx.translate(-centerX, -centerY);
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//图片
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this.image && ctx.drawImage(this.image, 0, 0);
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ctx.restore();
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//画图形
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ctx.save();
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this.renderShape(ctx);
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ctx.restore();
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},
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scaleTo: function scaleTo(offsetScale) {
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//获取图片中心点
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var containerData = this.containerData;
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this.calcTransform({
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scaleCenter: {
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x: containerData.width / 2,
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y: containerData.height / 2,
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step: offsetScale
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}
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});
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},
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//暂时只支持90deg旋转 否则limit 不能做
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rotateTo: function rotateTo(T) {
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if (!this.image) return;
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var targetTransform = this.targetTransform;
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var rotate = targetTransform.rotate;
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var newDeg = isFunction(T) ? T(rotate) : T;
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this.calcTransform({
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rotate: newDeg
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});
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},
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reset: function reset() {
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this.targetTransform.rotate = 0;
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var fitTransform = this.calcFitScreen();
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this.targetTransform = Object.assign({}, this.targetTransform, fitTransform);
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dispatchEvent(this.element, EVENT_VIEWER_TRANSFORM_CHANGE, cloneDeep(this.targetTransform));
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},
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getImgSize: function getImgSize() {
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if (!this.image) return;
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return {
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w: this.image.width,
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h: this.image.height
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};
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},
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getImage: function getImage() {
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return this;
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},
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calcFitScreen: function calcFitScreen() {
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if (!this.image) return;
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var w = this.containerData.width;
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var h = this.containerData.height;
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var iw = this.image.width;
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var ih = this.image.height;
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//算图片显示长款 （todo：旋转算旋转后）
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var _this$targetTransform = this.targetTransform.rotate,
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rotate = _this$targetTransform === void 0 ? 0 : _this$targetTransform;
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var wToh = w / h;
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var imgwToh = iw / ih;
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if (rotate % 180 !== 0) {
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imgwToh = ih / iw;
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}
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//计算后的位置
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var scale;
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var translateX = 0;
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var translateY = 0;
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if (imgwToh > wToh) {
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scale = w / iw;
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translateX = 0;
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translateY = (h - ih * scale) / 2;
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if (rotate % 180 !== 0) {
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scale = w / ih;
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translateX = (ih - iw) / 2 * scale;
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translateY = (h - iw * scale) / 2 + (iw - ih) / 2 * scale;
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}
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} else {
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scale = h / ih;
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translateX = (w - iw * scale) / 2;
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translateY = 0;
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if (rotate % 180 !== 0) {
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scale = h / iw;
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translateX = (w - ih * scale) / 2 + (ih - iw) / 2 * scale;
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translateY = (iw - ih) / 2 * scale;
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}
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}
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var fitTransform = {
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translateX: translateX,
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translateY: translateY,
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scale: scale
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};
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return fitTransform;
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},
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calcTransform: function calcTransform(newTransform, cropBox) {
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if (!this.image) return;
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var translateX = newTransform.translateX,
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translateY = newTransform.translateY,
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scaleCenter = newTransform.scaleCenter,
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rotate = newTransform.rotate;
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if (!isNil(scaleCenter)) {
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var _targetTransform = this.targetTransform,
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_this$limit2 = this.limit,
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limit = _this$limit2 === void 0 ? {} : _this$limit2;
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var _limit$minScale = limit.minScale,
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minScale = _limit$minScale === void 0 ? 0.1 : _limit$minScale,
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_limit$maxScale = limit.maxScale,
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maxScale = _limit$maxScale === void 0 ? Number.MAX_VALUE : _limit$maxScale;
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if (cropBox) {
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//如果有cropbox 最小缩放值需要重新计算
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var _this$image = this.image,
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iw = _this$image.width,
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ih = _this$image.height;
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if (_targetTransform.rotate % 180 !== 0) {
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var _ref = [ih, iw];
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iw = _ref[0];
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ih = _ref[1];
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}
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var cw = cropBox.width,
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ch = cropBox.height;
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var corpMinScale = Math.max(cw / iw, ch / ih);
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minScale = Math.max(corpMinScale, minScale);
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}
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var x = scaleCenter.x,
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y = scaleCenter.y,
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step = scaleCenter.step;
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var preScale = _targetTransform.scale;
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var newScale = _targetTransform.scale + step;
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newScale = Math.min(maxScale, Math.max(newScale, minScale));
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var newStep = newScale - preScale;
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if (newScale != preScale) {
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var offsetX = (x - _targetTransform.translateX) / _targetTransform.scale * newStep;
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var offsetY = (y - _targetTransform.translateY) / _targetTransform.scale * newStep;
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this.targetTransform.translateX = this.targetTransform.translateX - offsetX;
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this.targetTransform.translateY = this.targetTransform.translateY - offsetY;
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}
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this.targetTransform.scale = newScale;
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}
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if (!isNil(translateX)) {
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this.targetTransform.translateX += translateX;
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}
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if (!isNil(translateY)) {
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this.targetTransform.translateY += translateY;
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}
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if (!isNil(rotate)) {
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this.targetTransform.rotate = rotate;
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}
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//阻止拖出边界
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var targetTransform = this.targetTransform,
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containerData = this.containerData;
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var minMargin = 50;
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var imgWidth = this.image.width;
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var imgHeight = this.image.height;
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if (this.targetTransform.rotate % 180 !== 0) {
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imgWidth = this.image.height;
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imgHeight = this.image.width;
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}
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var minX = minMargin - imgWidth * targetTransform.scale;
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var maxX = containerData.width - minMargin;
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var minY = minMargin - imgHeight * targetTransform.scale;
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var maxY = containerData.height - minMargin;
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this.targetTransform.translateX = Math.min(maxX, Math.max(this.targetTransform.translateX, minX));
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this.targetTransform.translateY = Math.min(maxY, Math.max(this.targetTransform.translateY, minY));
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//限制截图框不能超出拖动范围
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if (cropBox) {
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var _cw = cropBox.width,
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_ch = cropBox.height,
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top = cropBox.top,
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left = cropBox.left;
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var _this$image2 = this.image,
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_iw = _this$image2.width,
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_ih = _this$image2.height;
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var imgLeftTop = {
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x: 0,
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y: 0
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};
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var imgRightBottom = {
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x: _iw,
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y: _ih
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};
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if (this.targetTransform.rotate % 180 !== 0) {
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imgLeftTop = {
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x: (_iw - _ih) / 2,
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y: (_ih - _iw) / 2
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};
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imgRightBottom = {
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x: (_iw + _ih) / 2,
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y: (_iw + _ih) / 2
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};
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}
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//图片左上角不能大于crop左上角
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var _maxX = left - imgLeftTop.x * this.targetTransform.scale;
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var _maxY = top - imgLeftTop.y * this.targetTransform.scale;
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//图片右下角不能小于crop 右下角
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var _minX = left + _cw - imgRightBottom.x * this.targetTransform.scale;
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var _minY = top + _ch - imgRightBottom.y * this.targetTransform.scale;
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this.targetTransform.translateX = Math.min(_maxX, Math.max(this.targetTransform.translateX, _minX));
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this.targetTransform.translateY = Math.min(_maxY, Math.max(this.targetTransform.translateY, _minY));
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}
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dispatchEvent(this.element, EVENT_VIEWER_TRANSFORM_CHANGE, cloneDeep(this.targetTransform));
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}
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}; |