我有这个代码片段,它使用CSS将整个页面的<canvas>
元素放入45度透视图中。但是,转换后的画布超出了页面的界限并被裁剪:
window.onload = window.onresize = function() {
// draw a gradient on the canvas
var canvas = document.querySelector('canvas');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
var ctx = canvas.getContext('2d');
var grad = ctx.createLinearGradient(0, 0, 0, canvas.height);
grad.addColorStop(0, '#ff0000');
grad.addColorStop(0.5, '#ffff00');
grad.addColorStop(1, '#00ff00');
ctx.fillStyle = grad;
ctx.fillRect(0, 0, canvas.width, canvas.height);
};
body {
margin: 0;
overflow: hidden;
}
canvas {
transform-style: preserve-3d;
transform: rotateX(45deg);
}
.container {
width: 100%;
height: 100%;
perspective: 50vw;
perspective-origin: 50% 0%;
}
<div class="container">
<canvas></canvas>
</div>
我如何确保整个画布保持在页面的边界内(梯形的底部应该与页面具有完全相同的宽度),同时保持透视效果?CSS或JavaScript解决方案都可以,只要它们适用于任何页面大小。
发布于 2018-08-12 01:41:25
使用translateZ
将其反向转换
在CSS中查找注释
window.onload = window.onresize = function() {
// draw a gradient on the canvas
var canvas = document.querySelector('canvas');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
var ctx = canvas.getContext('2d');
var grad = ctx.createLinearGradient(0, 0, 0, canvas.height);
grad.addColorStop(0, '#ff0000');
grad.addColorStop(0.5, '#ffff00');
grad.addColorStop(1, '#00ff00');
ctx.fillStyle = grad;
ctx.fillRect(0, 0, canvas.width, canvas.height);
};
body {
margin: 0;
overflow: hidden;
}
canvas {
transform-style: preserve-3d;
/* added translation here */
transform: translateZ(-50vmax) rotateX(45deg);
}
.container {
width: 100%;
height: 100%;
perspective: 50vw;
perspective-origin: 50% 0%;
}
<div class="container">
<canvas></canvas>
</div>
https://stackoverflow.com/questions/51802195
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