Canvas學習記錄繪製七巧板(01)
阿新 • • 發佈:2021-01-09
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
padding: 0;
margin: 0;
}
#canvas {
border: 1px solid #000;
display: block;
margin: 50px auto
}
</style>
</head>
<body>
<canvas id="canvas">
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</canvas>
<script>
window.onload = () => {
//獲取canvas標籤
var canvas = document.getElementById ('canvas');
canvas.width = 800; //設定canvas寬度
canvas.height = 800;//設定canvas高度
//獲取canvas上下文內容
var context = canvas.getContext('2d');
//每個點座標值集合
let params = [
{path: [{x: 100, y: 100}, {x: 400, y: 100}, {x: 250, y: 250}], color: "#fe665b"},
{ path: [{x: 100, y: 100}, {x: 100, y: 400}, {x: 250, y: 250}], color: "#03a697"},
{path: [{x: 400, y: 100}, {x: 325, y: 175}, {x: 325, y: 325}, {x: 400, y: 250}], color: "#ec3c60"},
{path: [{x: 400, y: 250}, {x: 250, y: 400}, {x: 400, y: 400}], color: "#f6ca2d"},
{path: [{x: 250, y: 250}, {x: 325, y: 325}, {x: 325, y: 175}], color: "#f6f020"},
{path: [{x: 100, y: 400}, {x: 250, y: 400}, {x: 175, y: 325}], color: "#f094c5"},
{path: [{x: 250, y: 250}, {x: 175, y: 325}, {x: 250, y: 400}, {x: 325, y: 325}], color: "#a796c2"},
];
//遍歷最外層
for (let i = 0; i < params.length; i++) {
draw(params[i], context);
}
}
function draw(data, cxt) {
cxt.beginPath(); //開始繪製
cxt.moveTo(data.path[0].x, data.path[0].y);//移動畫筆
for (let j = 0; j < data.path.length; j++) {
cxt.lineTo(data.path[j].x, data.path[j].y); //新增一個新的座標點 (該方法並不會建立線條)
cxt.fillStyle = data.color; //設定圖形填充的顏色
}
cxt.closePath();//結束繪製 //儲存每一個圖形的狀態
cxt.fill(); //設定樣式為填充模式
cxt.strokeStyle = '#000'; //設定線條顏色
cxt.lineWidth = 2;//設定線條寬度
cxt.stroke(); //方法會實際地繪製出通過 moveTo() 和 lineTo() 方法定義的路徑
}
</script>
</body>
</html>
效果圖: