将一个简单的画布视为
$(document).ready(function(){
draw();
});
function draw() {
var canvas = document.getElementById("canvas");
if (canvas.getContext) {
var ctx = canvas.getContext("2d");
ctx.fillStyle = "rgb(200,0,0)";
ctx.fillRect (10, 10, 55, 50);
ctx.fillStyle = "rgba(0, 0, 200, 0.5)";
ctx.fillRect (30, 30, 55, 50);
}
}
如何将变量引入jQuery函数以绘制具有已定义变量的多个画布(例如颜色集)。
实际上,我想用draw(variables)
提供的变量替换canvas id及其选项(如颜色),例如draw(canvas_id, color, ...)
。
示例:(用于在不同的DOM元素上创建多个画布)
function draw(ccc) {
var canvas = document.getElementById(ccc);
if (canvas.getContext) {
var ctx = canvas.getContext("2d");
ctx.fillStyle = "rgb(200,0,0)";
ctx.fillRect (10, 10, 55, 50);
ctx.fillStyle = "rgba(0, 0, 200, 0.5)";
ctx.fillRect (30, 30, 55, 50);
}
}
draw(canvas1);
draw(canvas2);
答案 0 :(得分:1)
试试这个:
function draw(id, clr, fill) {
var canvas = document.getElementById(id);
if (canvas.getContext) {
var ctx = canvas.getContext("2d");
ctx.fillStyle = clr;
ctx.fillRect (fill);
}
}
答案 1 :(得分:1)
这是你可以做到的一种方式:
function draw(colors) {
var canvas = document.getElementById("canvas");
if (canvas.getContext) {
var ctx = canvas.getContext("2d");
for(var i=0; i < colors.length; i ++){
ctx.fillStyle = colors[i];
ctx.fillRect (10*i, 10*i, 55, 50);
}
}
}
// define some colors in an array
var colors = ["rgb(200,0,0)","rgba(0, 0, 200, 0.5)","rgba(0, 128, 200, 0.5)"];
draw(colors);
修改强>