Tag: redraw

resize时html5canvas重绘

我有两个canvas元素，需要在按钮点击时resize。 和脚本： var sketch;var sketch_sl;var onPaint;var canvas=null;var ctx=null;var tmp_ctx=null; function drawCanvas(div) { canvas = document.querySelector(div + ” #canvasGraph”); ctx = canvas.getContext(‘2d’); sketch = document.querySelector(div + ” #canvasDiv”); sketch_sl = getComputedStyle(sketch); canvas.width = parseInt(sketch_style.getPropertyValue(‘width’)); canvas.height = parseInt(sketch_style.getPropertyValue(‘height’)); tmp_canvas = document.createElement(‘canvas’); tmp_ctx = tmp_canvas.getContext(‘2d’); tmp_canvas.id = ‘tmp_canvas’; tmp_canvas.width = canvas.width; tmp_canvas.height = canvas.height; sketch.appendChild(tmp_canvas); 重绘function： // here […]