var ctx = c.getContext('2d'); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var cx = w / 2; var cy = h / 2; var fl = 1000; function prj(obj) { var cz = ...
var ctx = c.getContext('2d'); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var cx = w / 2; var cy = h / 2; var Box = function(x, y, vx, color) { this...
var ctx = c.getContext('2d'); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var cx = w / 2; var cy = h / 2; var fl = 1000; function prj(obj) { var cz = ...
var cxt=canvas.getContext("2d"); var flag=0; canvas.onmousedown=function(evt){ evt=window.event?window.event:evt; var startX=evt.pageX-this.offsetLeft; var startY=evt.pageY-this.offsetTop; ...
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var ctx = c.getContext('2d'); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var cx = w / 2; var cy = h / 2; var fl = 1000; function prj(obj) { var cz = ...
由于微信小程序本身并不直接支持原生的canvas元素，uni-ec-canvas作为桥梁，实现了ECharts与微信小程序环境的对接。 **安装ECharts和uni-ec-canvas** 要在uni-app项目中使用uni-ec-canvas，你需要先安装ECharts和...
var ctx = c.getContext('2d'); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var cx = w / 2; var cy = h / 2; var Box = function(x, y, vx, color) { this...
const ctx = canvas.getContext('2d'); const snowflakes = []; // 初始化粒子数组，根据需要调整数量 for (let i = 0; i ; i++) { snowflakes.push(new Snowflake(Math.random() * canvas.width, Math.random() *...
var ctx = c.getContext('2d'); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var cx = w / 2; var cy = h / 2; var fl = 1000; function prj(obj) { var cz = ...
this.ctx = this.canvas.getContext("2d"); document.body.appendChild(this.canvas); window.addEventListener("resize", () => this.onResize()); this.onResize(); this.updateBound = this.update....
* self.selectCanvas.getContext("2d").saveHistory(points, copy_segments, copy_rounds, copy_controlLine, * copy_selectedSegments, copy_selectedPoints); * 回撤及前进功能代码示例 * $(window).keydown...
要在这个画布上绘画，我们需要通过调用canvas对象的`getContext()`方法来获取一个绘图环境，即2D渲染上下文或3D渲染上下文（WebGL）。 在这个实例中，我们关注的是2D绘图环境。`getContext('2d')`方法用于获取...
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ctx.bezierCurveTo(this.x + this.size, this.y + this.size / 2, this.x, this.y + this.size, this.x - this.size / 2, this.y); ctx.closePath(); ctx.fillStyle = 'red'; ctx.fill(); } } ``` `draw`方法...
var cxt=canvas.getContext("2d"); var flag=0; canvas.onmousedown=function(evt){ evt=window.event?window.event:evt; var startX=evt.pageX-this.offsetLeft; var startY=evt.pageY-this.offsetTop; ...
var octx = ocas.getContext("2d"); var ctx = canvas.getContext("2d"); ocas.width = canvas.width = window.innerWidth; ocas.height = canvas.height = 700; var bigbooms = []; window.onload = ...
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在部分内容中，作者首先提到使用 Spring Oauth2 框架获取当前登录用户信息的实现代码，然后提到可以通过 `SecurityContextHolder.getContext().getAuthentication().getPrincipal()` 获取到当前用户的用户名。...
this.context = this.canvas.getContext('2d'); // 默认颜色、线条宽度等 this.color = 'black'; this.lineWidth = 1; // ... } } ``` 为了记录用户的触摸动作，我们需要监听`touchstart`、`touchmove`和`...
this.context = this.$canvas.get(0).getContext('2d'); this.center = { x: this.width / 2, y: this.height / 2 }; this.rotationX = this.MAX_ROTATION_ANGLE; this.rotationY = this.MAX_ROTATION_ANGLE;...
const ctx = this.$refs.imageContainer.querySelector('canvas').getContext('2d'); ctx.strokeStyle = 'red'; ctx.lineWidth = 2; ctx.strokeRect(x1, y1, x2 - x1, y2 - y1); }, }, ``` 4. **获取对角...
例如，可以使用`getContext('2d')`获取2D渲染上下文，这是大多数图形绘制的基础。 二、粒子系统原理 粒子系统是一种模拟复杂图形效果的方法，它通过大量简单的小元素（粒子）组合来创建复杂的视觉效果，如火焰、...
this.ctx = canvas.getContext('2d'); canvas.setAttribute("width", this.img.width); canvas.setAttribute("height", this.img.height); this.ctx.drawImage(this.img, 0, 0); this.ghost = this.img; this....
if (this.y + this.size > this.ty || this.y - this.size < this.ty) { this.speed *= -1; } this.y += this.speed; var distance = Math.sqrt(Math.pow(this.x - this.tx, 2) + Math.pow(this.y - this.ty, ...