<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <canvas id="canvas" width="600" height="600" style="background:gray"&g…
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <canvas id="drawing" width="200" height="200" style="background:gray;"…
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <canvas id="canvas" width="400" height="400" style="background:gray;"&…
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <canvas id="canvas" width="400" height="400" style="background:gray;"&…
function drawInBlackAndWhite() { var imagedata = context.getImageData(0, 0, canvas.width, canvas.height) var data = imagedata.data for (var i = 0, l = data.length - 4; i < l; i+=4) { var average = (data[i] + data[i+1] + data[i+2]) / 3 data[i] = data[…
var canvas = document.getElementById('canvas') var context = canvas.getContext('2d') var angle = 0 function move() { context.clearRect(0,0,canvas.width,canvas.height) context.save() context.beginPath() context.lineWidth = 0.5 context.strokeStyle = 'r…
context.lineWidth = 0.5 incorrect display lineWidth=1 at html5 canvas canvas.save() canvas.restore() 作用 HTML5 canvas clip() 方法…
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <canvas id="drawing" width="200" height="200">A drawing of something</canv…
[canvas]Demo1 scale缩放 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>图片</title> </head> <body> <canvas id="wapper" width="1000" height="…
[canvas]Demo1 drawImage drawImage(img,x,y); <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>图片</title> </head> <body> <canvas id="wapper" width="50…