canvas.width= window.innerWidth*2;//获取屏幕宽度作为canvas的宽度 这个设置的越大,画面越清晰(相当于绘制的图像大,然后被css缩小)canvas.height = window.innerHeight*2;functiondraw1() { video.play(); timer= setInterval(function(){if(video.currentTime >=3.8){//视频时间在3.8s时停止video.pause();...
this.ctx.drawImage(video,0,0,widht,height) 我这个没法正常绘画
video.addEventListener('play', function() { var draw = function() { if (!video.paused && !video.ended) { // 将视频帧绘制到canvas context.drawImage(video, 0, 0, canvas.width, canvas.height); // 递归调用以持续绘制 requestAnimationFrame(draw); } }; draw(); }, false); }; 四、在...
draw)6}else{7video.addEventListener('play',function() {8timer = setInterval(function() {9context.drawImage(video, 0, 0)10}, 20)11})1213video.addEventListener('pause',function(){14clearInterval(timer)15})1617video.addEventListener('pause',function(){18clearInterval...
Barrage.prototype.draw = function() { if(this.x < -200) { return } else { this.ctx.font = this.fontSize + 'px "microsoft yahei", sans-serif'; this.ctx.fillStyle = this.color this.x = this.x - this.speed this.ctx.fillText(this.value, this.x, this.y) ...
室内设计室内手绘全景720平板手绘 全景手绘mental canvas draw使... 展开 @纯粹劳彩媚室内手绘创作的原声一纯粹劳彩媚室内手绘 @纯粹劳彩媚室内手绘创作的原声一纯粹劳彩媚室内手绘 @纯粹劳彩媚室内手绘创作的原声一纯粹劳彩媚室内手绘 2000+ 60+ 打开App 打开抖音 再看一遍...
function drawImg(context,image) { for(var i = 0;i < 7;i ) context.drawImage(image,0 i * 50,0 i * 25,199,46); } </script> </head> <body οnlοad="draw('canvas');"> <canvas id="canvas" width="400" height="300" /> ...
let drawType = "" // 当视频元素加载完成后执行 video.addEventListener('loadedmetadata', function () { // 设置画布大小与视频尺寸相同 canvas.width = video.videoWidth; canvas.height = video.videoHeight; }); // 在每一帧绘制视频画面到画布上 function drawFrame() { ctx.drawImage(video, 0, 0,...
在上面的代码中,首先通过getElementById()方法获取canvas元素和video元素,然后通过getContext(‘2d’)方法获取绘图上下文。接下来给video元素添加play事件监听器,当视频开始播放时,调用drawVideo()函数。drawVideo()函数使用drawImage()方法将视频绘制到canvas中,然后使用setTimeout()方法每20毫秒执行一次drawVideo()函数,...
useEffect(() => { if (!waveCanvas) { return } draw?.() }, [waveCanvas, draw, currentTime, duration]); // 各种场景都有可能触发重新绘制 draw函数中,分别对提到的三个元素(背景、刻度尺、时间指针)进行绘制。 const draw = () => { const ctx = waveCanvas && waveCanvas?.getContext("2d"...