[英]How to clear the fillText that is setInterval?
這是一個簡單的代碼,用於動畫畫布中的一行文本,但是當我使用clearRect
它仍然保留在畫布上並且不會被刪除。
這是WebApp:
<title>Error Clearing FillText</title>
<script type="text/javascript">
var c, ctx, episode;
var map01 = "Overgrown...", map02 = "Flood Zone...";
function load() {
c = document.getElementById("canvas");
ctx = c.getContext("2d");
episode = document.getElementById("episode");
ctx.clearRect(0, 0, 400, 240);
ctx.drawImage(episode, 10, 5);
ctx.font = "20px san-serif";
ctx.fillStyle = "white";
}
var nameCharCount1 = 0, nameCharCount2 = 0;
function funcMap01() {
ctx.clearRect(0, 0, 400, 240);
ctx.drawImage(episode, 10, 5);
setInterval('loadMap01()', 70);
}
function funcMap02() {
ctx.clearRect(0, 0, 400, 240);
ctx.drawImage(episode, 10, 5);
setInterval('loadMap02()', 70);
}
function loadMap01() {
nameCharCount1++;
var text = map01.substring(0, nameCharCount1);
ctx.setFillStyle = "0";
ctx.fillText(text, 16, 25);
}
function loadMap02() {
nameCharCount2++;
var text = map02.substring(0, nameCharCount2);
ctx.setFillStyle = "0";
ctx.fillText(text, 16, 25);
}
addEventListener("load", load, false);
</script>
</head>
<body>
<canvas id="canvas" width="400" height="240" style="border: 1px solid #000000;">
</canvas>
<br>
<button onclick="funcMap01();">Overgrown...</button>
<button onclick="funcMap02();">Flood Zone...</button>
<h1>I hate arrays..</h1>
</body>
<img id="episode" src="http://i717.photobucket.com/albums/ww176/T3ZTAM3NT/Episode_zps4fa66a1b.png" style="display: none;">
關於如何清理文本,您有任何提示/想法嗎?
我做了一個小提琴,所以檢查一下:
以下是編輯過的代碼。 我所做的就是清除第二個函數調用中的第一個函數區間,反之亦然。
腳本
var c, ctx, episode;
var map01 = "Overgrown...", map02 = "Flood Zone...";
var interval1,interval2;
function load() {
c = document.getElementById("canvas");
ctx = c.getContext("2d");
episode = document.getElementById("episode");
ctx.clearRect(0, 0, 400, 240);
ctx.drawImage(episode, 10, 5);
ctx.font = "20px san-serif";
ctx.fillStyle = "white";
}
var nameCharCount1 = 0, nameCharCount2 = 0;
function funcMap01() {
clearInterval(interval2);
ctx.clearRect(0, 0, 400, 240);
ctx.drawImage(episode, 10, 5);
interval1=setInterval('loadMap01()', 70);
}
function funcMap02() {
clearInterval(interval1);
ctx.clearRect(0, 0, 400, 240);
ctx.drawImage(episode, 10, 5);
interval2=setInterval('loadMap02()', 70);
}
function loadMap01() {
nameCharCount1++;
var text = map01.substring(0, nameCharCount1);
ctx.setFillStyle = "0";
ctx.fillText(text, 16, 25);
}
function loadMap02() {
nameCharCount2++;
var text = map02.substring(0, nameCharCount2);
ctx.setFillStyle = "0";
ctx.fillText(text, 16, 25);
}
addEventListener("load", load, false);
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