asp.net video上放canvas如何顯示全螢幕圖案
时间: 2023-08-11 09:22:59 浏览: 34
要在ASP.NET视频中的canvas上显示全屏图案,你可以使用HTML5的全屏API。以下是一些示例代码:
1. 首先,你需要为canvas元素添加一个全屏按钮:
```
<button onclick="toggleFullScreen()">全屏</button>
<canvas id="myCanvas"></canvas>
```
2. 然后,你需要在JavaScript中编写一个函数来切换全屏模式:
```
function toggleFullScreen() {
var canvas = document.getElementById("myCanvas");
if (!document.fullscreenElement && !document.mozFullScreenElement && !document.webkitFullscreenElement && !document.msFullscreenElement ) {
if (canvas.requestFullscreen) {
canvas.requestFullscreen();
} else if (canvas.msRequestFullscreen) {
canvas.msRequestFullscreen();
} else if (canvas.mozRequestFullScreen) {
canvas.mozRequestFullScreen();
} else if (canvas.webkitRequestFullscreen) {
canvas.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
}
} else {
if (document.exitFullscreen) {
document.exitFullscreen();
} else if (document.msExitFullscreen) {
document.msExitFullscreen();
} else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
} else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen();
}
}
}
```
3. 最后,你需要在canvas元素的CSS样式中添加一些属性,使它占据整个屏幕:
```
canvas {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
}
```
这样,当你点击全屏按钮时,canvas元素将占据整个屏幕,并显示你所绘制的图案。