Finally, you can draw on the canvas. Set the fill-color to red with thefillStyleproperty: ctx.fillStyle="red"; ThefillStyleproperty can be a color, a gradient, or a pattern. The defaultfillStyleis black. ThefillRect(x, y, width, height)method draws the rectangle, filled with the fill ...
例1.1first example of drawing on the canvas import simplegui # define draw handler 注意这里的参数canvas看上去好像从天而降一样,其实这是语法惯例 def draw(canvas): canvas.draw_text("Hello!",[100, 100], 24, "White") canvas.draw_circle([150, 150], 30,10 , "Red") # create frame frame...
If you want to upload and save the created image to the server checkout this tutorial : Draw a Canvas image, Upload and save it on the server, also I extended this tutorial to addUndo and Redo functions to the canvas. Here's a live exemple you can play with onsnippet.run: A sample...
window.onload = draw;// This function is called on page load.functiondraw(){// Get the canvas element.varcanvas =document.getElementById("canvas");// Specify a 2d drawing context.varcontext = canvas.getContext("2d");// Set the color to the RGB equivalent of gold.context.fillStyle ="...
1)其实canvas跟HTML的其他元素没有什么太大的区别。在页面中放置一个canvas元素,需要指定的是ID width、height这三个属性。2)在脚本导入之处,使用了<script type="text/javascript" src="script.js" charset="utf-8"></script>3)在body的属性中,使用了onload="draw('canvas');"调用脚本文件中的draw函数进行...
<canvasid="eggCanvas"width="150"height="150"></canvas> 1. 绘制大头熊 绘制大头熊,代码如下所示: functiondrawBigHead(){ varc =document.getElementById("bigHeadCanvas"); varctx = c.getContext("2d"); ctx.beginPath(); ctx.arc(50,50,50,Math.PI*1.85,Math.PI*1.15); ...
functiondraw(){varcanvas=document.getElementById('tutorial');if(!canvas.getContext)return;varctx=canvas.getContext("2d");ctx.beginPath();ctx.moveTo(50,50);ctx.lineTo(200,50);ctx.lineTo(200,200);ctx.closePath();//虽然我们只绘制了两条线段,但是closePath会closePath,仍然是一个3角形ctx.stro...
When we draw on the Canvas context, we can make use of a stack of so-called drawing states. Each of these states stores data about the Canvas context at any one time. Here is a list of the data stored in the stack for each state: Transformation matrix information such as rotations or...
首先要准备一张有连续帧的图片,然后利用HTML5 Canvas的draw方法在不同的时间间隔绘制不同的帧,这样看起来就像动画在播放。 关键技术点: JavaScript 函数setTimeout()有两个参数,第一个是参数可以传递一个JavaScript方法, 另外一个参数代表间隔时间,单位为毫秒数。代码示例: ...
function draw(){ var canvas = document.getElementById('tutorial'); if(!canvas.getContext) return; var ctx = canvas.getContext("2d"); //开始代码 } draw(); </script> </html> 2.5 一个简单的例子 以下实例绘制两个长方形: 实例 <html> ...