如何使画布100％适合屏幕? [英] how to make canvas 100% fit to the screen?
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问题描述
我有一个程序，可通过鼠标拖动在画布上移动对象.但是，我希望画布适合屏幕.我不确定如何实现这一目标.如果将画布设置为宽度:100％；高度:100％；"，则该对象将超出范围.
I have a program for moving an object on a canvas on mouse drag. However, I want the canvas to fit the screen. I am not sure how to achieve that. If I make the canvas "width:100%; height:100%;", then the object goes out of scope.
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css"/> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js">
</script>
<style>
body{ background-color: ivory; }
canvas{border:1px solid red;}
</style>
<script>
$(function(){
var img = new Image();
img.onload = function(){
ctx.drawImage(img, 0,0);
};
img.src = "http://images.christmastimeclipart.com/images/2/1271716593176_1788/img_1271716593176_17881.jpg";
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
var canvasOffset=$("#canvas").offset();
var offsetX=canvasOffset.left;
var offsetY=canvasOffset.top;
var canvasWidth=canvas.width;
var canvasHeight=canvas.height;
var isDragging=false;
// functions to handle mouseup, mousedown, mousemove, mouseout events
$("#canvas").mousedown(function(e){handleMouseDown(e);});
$("#canvas").mousemove(function(e){handleMouseMove(e);});
$("#canvas").mouseup(function(e){handleMouseUp(e);});
$("#canvas").mouseout(function(e){handleMouseOut(e);});
}); // end $(function(){});
</script>
</head>
<body>
<canvas id="canvas" width=400 height=300></canvas>
</body>
</html>
推荐答案
如何使画布100％适合屏幕?
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" />
<!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body {
margin: 0;
padding: 0;
background-color: ivory;
}
#canvas {
position: absolute;
width: 100%;
height: 100%;
border: 1px solid red;
}
</style>
<script>
$(function () {
var img = new Image();
img.onload = function () {
ctx.drawImage(img, 0, 0);
};
img.src =
"http://images.christmastimeclipart.com/images/2/1271716593176_1788/img_1271716593176_17881.jpg";
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var canvasOffset = $("#canvas").offset();
var offsetX = canvasOffset.left;
var offsetY = canvasOffset.top;
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
/*var canvasWidth=canvas.width;
var canvasHeight=canvas.height;*/
var isDragging = false;
// functions to handle mouseup, mousedown, mousemove, mouseout events
$("#canvas").mousedown(function (e) {
handleMouseDown(e);
});
$("#canvas").mousemove(function (e) {
handleMouseMove(e);
});
$("#canvas").mouseup(function (e) {
handleMouseUp(e);
});
$("#canvas").mouseout(function (e) {
handleMouseOut(e);
});
}); // end $(function(){});
</script>
</head>
<body>
<canvas id="canvas"></canvas>
</body>
</html>
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