const canvas = document.getElementById("myCanvas"); const ctx = canvas.getContext("2d"); ctx.rect(10,10, 150,100); ctx.stroke();</script> Try it Yourself » Notice that the rect() method does not draw the rectangle (it just defines it). So, in addition, you have to use ...
下面,我就简单了解一下,canvas是如何绘画基本shape的(矩形、直线、圆弧、贝赛尔曲线)等; 先贴一个以下所有涉及到的实现运行的基本代码段: Base code 以下所有实例代码,只要把上面的function drawScreen()替换掉即可! Basic Rectangle Shape(矩形) 在Canvas中,画矩形有三种方式:filling(), stroking(), or clearing ...
One of the easiest shapes to draw on an HTML5 canvas element is a rectangle. You do so using the 2D Context functionsfillRect()andstrokeRect(). Here is a simple example: var canvas = document.getElementById("ex1"); var context = canvas.getContext("2d"); context.fillStyle = "#ff0000...
addColorStop(1,"#000"); // black at the end of the gradientmyContext.fillStyle = myGradient; // ensure the next call to fillRect will use the specified gradientmyContext.fillRect(0,0,500,500); // rectangle that contains the gradient spans the entire canvas}CSS3 转换和动画 CSS3 转换和...
functionDraw(){varctx=document.getElementById('MyCanvas').getContext("2d");//Canvas Code Comes Here} Lab 1.1 使用 Path Path 由0个或多个Sub Path组成,每个Sub path 是是由一个或多个终点组成,每个终点是通过直线或曲线连接的。 Lab1.1.1 使用Single 创建Path; ...
In the above code snippet, on click of the button, theDrawRectangle()function executes. As usual we got our context object from the canvas and called the beginPath() method to start drawing the rectangle. The xxxRect method accepts four parameter ...
11//You are done! Now you can draw your first rectangle. 12//You only need to provide the (x,y) coordinates, followed by the width and 13//height dimensions. 14context.fillRect(0,0,150,100); 15} 16} 可以把上面代码放置在文档 head 部分中,或者放在外部文件中。
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 ...
// Draw red rectangle after clip() ctx.fillStyle="red"; ctx.fillRect(0,0,150,100); </script> 尝试一下 » 浏览器支持 Internet Explorer 9、Firefox、Opera、Chrome 和 Safari 支持 clip() 方法。 注意:Internet Explorer 8 及之前的版本不支持 <canvas> 元素。
HTML Canvas ReferenceExample Draw a 150*100 pixels rectangle: YourbrowserdoesnotsupporttheHTML5canvastag. JavaScript: var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.rect(20,20,150,100); ctx.stroke(); Try it yourself » ...