当我将鼠标悬停在城市上时，我尝试在丹麦 map 上设置信息。 我试图弄清楚如何在我的绘图图像上设置我的 fillRect ，因为它在它后面，以及如何在将鼠标悬停在它上面后设置事件。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
// add map to div
function startCanvas() {
var c = document.getElementById("myCanvas"); //get element by id
var ctx = c.getContext("2d");
//add new image to canavas
var image = new Image();
image.onload = function () {
// draw image
ctx.drawImage(image, 69, 50);
};
// the image file, want this image to be set to back
image.src = 'denmark.jpg';
// draw rectangle, want this to be st to front
ctx.fillStyle = "#FF0000";
ctx.fillRect(0, 0, 150, 75);
}
</script>
</head>
<body onload="startCanvas()">
//canvas
<canvas id="myCanvas" width="600" height="600";">
Your browser does not support the HTML5 canvas tag.</canvas>
</body>
</html>
最佳答案
如果你想让它在前面，你需要在图像后面绘制矩形。尝试这个:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
// add map to div
function startCanvas() {
var c = document.getElementById("myCanvas"); //get element by id
var ctx = c.getContext("2d");
//add new image to canavas
var image = new Image();
image.onload = function () {
// draw image
ctx.drawImage(image, 69, 50);
// draw rectangle, want this to be st to front
ctx.fillStyle = "#FF0000";
ctx.fillRect(0, 0, 150, 75);
};
// the image file, want this image to be set to back
image.src = 'denmark.jpg';
}
</script>
</head>
<body onload="startCanvas()">
//canvas
<canvas id="myCanvas" width="600" height="600";">
Your browser does not support the HTML5 canvas tag.</canvas>
</body>
</html>
关于javascript - 我如何将我的绘制图像与我的填充矩形重叠，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14867958/