也許我錯過了一些基本的東西。調整大小的畫布內容
我用對象填充畫布。在用戶輸入中,我需要調整畫布的大小(從而縮放內容)。
JS(簡化):
var c = document.getElementById('c');
var cc = c.getContext('2d');
cc.beginPath();
cc.rect(20, 20, 20, 12);
cc.fill();
function resizeCanvas(size){
var c = document.getElementById('c');
var cc = c.getContext('2d');
// This will make the content disappear
c.width = c.style.width = c.height = c.style.height = size;
}
HTML
<canvas id="c" width="200" height="200"></canvas>
<br/>
<button onclick='resizeCanvas(100);return false;'>Resize</button>
CSS
canvas {border: 1px solid black}
畫布的大小,但該內容被消隱。任何想法?