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Co-Authored-By: 狸花猫/Claude-Qwen3.6-Plus 🐾
247 lines
9.9 KiB
JavaScript
247 lines
9.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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var tslib_1 = require("tslib");
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var g_base_1 = require("@antv/g-base");
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var hit_1 = require("./util/hit");
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var Shape = require("./shape");
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var group_1 = require("./group");
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var util_1 = require("./util/util");
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var draw_1 = require("./util/draw");
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var Canvas = /** @class */ (function (_super) {
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tslib_1.__extends(Canvas, _super);
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function Canvas() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Canvas.prototype.getDefaultCfg = function () {
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var cfg = _super.prototype.getDefaultCfg.call(this);
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// 设置渲染引擎为 canvas，只读属性
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cfg['renderer'] = 'canvas';
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// 是否自动绘制，不需要用户调用 draw 方法
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cfg['autoDraw'] = true;
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// 是否允许局部刷新图表
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cfg['localRefresh'] = true;
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cfg['refreshElements'] = [];
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// 是否在视图内自动裁剪
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cfg['clipView'] = true;
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// 是否使用快速拾取的方案，默认为 false，上层可以打开
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cfg['quickHit'] = false;
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return cfg;
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};
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/**
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* 一些方法调用会引起画布变化
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* @param {ChangeType} changeType 改变的类型
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*/
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Canvas.prototype.onCanvasChange = function (changeType) {
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/**
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* 触发画布更新的三种 changeType
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* 1. attr: 修改画布的绘图属性
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* 2. sort: 画布排序，图形的层次会发生变化
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* 3. changeSize: 改变画布大小
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*/
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if (changeType === 'attr' || changeType === 'sort' || changeType === 'changeSize') {
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this.set('refreshElements', [this]);
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this.draw();
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}
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};
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Canvas.prototype.getShapeBase = function () {
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return Shape;
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};
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Canvas.prototype.getGroupBase = function () {
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return group_1.default;
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};
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/**
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* 获取屏幕像素比
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*/
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Canvas.prototype.getPixelRatio = function () {
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var pixelRatio = this.get('pixelRatio') || util_1.getPixelRatio();
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// 不足 1 的取 1，超出 1 的取整
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return pixelRatio >= 1 ? Math.ceil(pixelRatio) : 1;
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};
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Canvas.prototype.getViewRange = function () {
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return {
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minX: 0,
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minY: 0,
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maxX: this.cfg.width,
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maxY: this.cfg.height,
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};
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};
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// 复写基类的方法生成标签
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Canvas.prototype.createDom = function () {
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var element = document.createElement('canvas');
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var context = element.getContext('2d');
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// 缓存 context 对象
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this.set('context', context);
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return element;
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};
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Canvas.prototype.setDOMSize = function (width, height) {
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_super.prototype.setDOMSize.call(this, width, height);
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var context = this.get('context');
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var el = this.get('el');
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var pixelRatio = this.getPixelRatio();
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el.width = pixelRatio * width;
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el.height = pixelRatio * height;
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// 设置 canvas 元素的宽度和高度，会重置缩放，因此 context.scale 需要在每次设置宽、高后调用
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if (pixelRatio > 1) {
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context.scale(pixelRatio, pixelRatio);
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}
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};
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// 复写基类方法
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Canvas.prototype.clear = function () {
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_super.prototype.clear.call(this);
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this._clearFrame(); // 需要清理掉延迟绘制的帧
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var context = this.get('context');
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var element = this.get('el');
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context.clearRect(0, 0, element.width, element.height);
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};
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Canvas.prototype.getShape = function (x, y) {
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var shape;
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if (this.get('quickHit')) {
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shape = hit_1.getShape(this, x, y);
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}
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else {
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shape = _super.prototype.getShape.call(this, x, y, null);
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}
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return shape;
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};
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// 对绘制区域边缘取整，避免浮点数问题
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Canvas.prototype._getRefreshRegion = function () {
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var elements = this.get('refreshElements');
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var viewRegion = this.getViewRange();
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var region;
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// 如果是当前画布整体发生了变化，则直接重绘整个画布
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if (elements.length && elements[0] === this) {
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region = viewRegion;
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}
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else {
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region = draw_1.getMergedRegion(elements);
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if (region) {
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region.minX = Math.floor(region.minX);
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region.minY = Math.floor(region.minY);
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region.maxX = Math.ceil(region.maxX);
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region.maxY = Math.ceil(region.maxY);
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region.maxY += 1; // 在很多环境下字体的高低会不一致，附加一像素，避免残影
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var clipView = this.get('clipView');
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// 自动裁剪不在 view 内的区域
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if (clipView) {
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region = draw_1.mergeView(region, viewRegion);
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}
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}
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}
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return region;
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};
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/**
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* 刷新图形元素，这里仅仅是放入队列，下次绘制时进行绘制
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* @param {IElement} element 图形元素
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*/
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Canvas.prototype.refreshElement = function (element) {
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var refreshElements = this.get('refreshElements');
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refreshElements.push(element);
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// if (this.get('autoDraw')) {
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// this._startDraw();
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// }
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};
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// 清理还在进行的绘制
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Canvas.prototype._clearFrame = function () {
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var drawFrame = this.get('drawFrame');
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if (drawFrame) {
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// 如果全部渲染时，存在局部渲染，则抛弃掉局部渲染
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util_1.clearAnimationFrame(drawFrame);
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this.set('drawFrame', null);
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this.set('refreshElements', []);
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}
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};
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// 手工调用绘制接口
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Canvas.prototype.draw = function () {
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var drawFrame = this.get('drawFrame');
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if (this.get('autoDraw') && drawFrame) {
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return;
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}
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this._startDraw();
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};
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// 绘制所有图形
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Canvas.prototype._drawAll = function () {
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var context = this.get('context');
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var element = this.get('el');
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var children = this.getChildren();
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context.clearRect(0, 0, element.width, element.height);
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draw_1.applyAttrsToContext(context, this);
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draw_1.drawChildren(context, children);
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// 对于 https://github.com/antvis/g/issues/422 的场景，全局渲染的模式下也会记录更新的元素队列，因此全局渲染完后也需要置空
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this.set('refreshElements', []);
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};
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// 绘制局部
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Canvas.prototype._drawRegion = function () {
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var context = this.get('context');
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var refreshElements = this.get('refreshElements');
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var children = this.getChildren();
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var region = this._getRefreshRegion();
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// 需要注意可能没有 region 的场景
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// 一般发生在设置了 localRefresh ,在没有图形发生变化的情况下，用户调用了 draw
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if (region) {
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// 清理指定区域
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context.clearRect(region.minX, region.minY, region.maxX - region.minX, region.maxY - region.minY);
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// 保存上下文，设置 clip
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context.save();
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context.beginPath();
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context.rect(region.minX, region.minY, region.maxX - region.minX, region.maxY - region.minY);
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context.clip();
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draw_1.applyAttrsToContext(context, this);
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// 确认更新的元素，这个优化可以提升 10 倍左右的性能，10W 个带有 group 的节点，局部渲染会从 90ms 下降到 5-6 ms
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draw_1.checkRefresh(this, children, region);
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// 绘制子元素
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draw_1.drawChildren(context, children, region);
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context.restore();
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}
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else if (refreshElements.length) {
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// 防止发生改变的 elements 没有 region 的场景，这会发生在多个情况下
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// 1. 空的 group
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// 2. 所有 elements 没有在绘图区域
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// 3. group 下面的 elements 隐藏掉
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// 如果不进行清理 hasChanged 的状态会不正确
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draw_1.clearChanged(refreshElements);
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}
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util_1.each(refreshElements, function (element) {
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if (element.get('hasChanged')) {
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// 在视窗外的 Group 元素会加入到更新队列里，但实际却没有执行 draw() 逻辑，也就没有清除 hasChanged 标记
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// 即已经重绘完、但 hasChanged 标记没有清除的元素，需要统一清除掉。主要是 Group 存在问题，具体原因待排查
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element.set('hasChanged', false);
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}
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});
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this.set('refreshElements', []);
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};
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// 触发绘制
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Canvas.prototype._startDraw = function () {
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var _this = this;
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var drawFrame = this.get('drawFrame');
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var drawFrameCallback = this.get('drawFrameCallback');
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if (!drawFrame) {
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drawFrame = util_1.requestAnimationFrame(function () {
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if (_this.get('localRefresh')) {
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_this._drawRegion();
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}
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else {
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_this._drawAll();
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}
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_this.set('drawFrame', null);
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if (drawFrameCallback) {
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drawFrameCallback();
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}
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});
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this.set('drawFrame', drawFrame);
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}
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};
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Canvas.prototype.skipDraw = function () { };
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Canvas.prototype.removeDom = function () {
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var el = this.get('el');
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// 需要清理 canvas 画布内容，否则ios下 创建的canvas垃圾未回收，导致Total canvas memory use exceeds问题
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// 相关问题列表
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// https://stackoverflow.com/questions/52532614/total-canvas-memory-use-exceeds-the-maximum-limit-safari-12
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// https://github.com/openlayers/openlayers/issues/9291
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el.width = 0;
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el.height = 0;
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el.parentNode.removeChild(el);
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};
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return Canvas;
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}(g_base_1.AbstractCanvas));
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exports.default = Canvas;
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//# sourceMappingURL=canvas.js.map
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