スライダーの動きに二次曲線を描こうとしています。スライダーが動くと曲線が描かれます。二次曲線とベジェ曲線に対してこれを行いたいです。これはクロムでのみ動作する私のコードです
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style type="text/css">
.wrapper {
margin: 0 auto;
width: 1000px;
}
.canHdr {
float: left;
width: 450px;
height: 400px;
border: 1px solid red;
}
</style>
</head>
<body>
<form>
<!-- wrapper -->
<div class="wrapper">
<!-- canHdr -->
<div id="canHdr" class="canHdr" >
<p>
This is my 1st div with quadratic curve I want to draw this curve as I move the slider. I want to make it dynamic so when I should be able to change the curve points. Also I want to move an object on that curve as I am doing in my 3rd div.
</p>
<div class="canOuterHdr" >
<canvas id="myCanvas1" width="300" height="195" style="position: relative;">
[No canvas support]
</canvas>
</div>
<div id="slider1" class="newBg">
<input id="slide1" type="range" min="0" max="100" step="1" value="0" onchange="counterSlider('slide1');" />
</div>
</div>
<!--/ canHdr -->
<!-- canHdr2 -->
<div id="canHdr2" class="canHdr" >
<p>
This is my 2nd div. I have bezier curve. I want to make it dynamic so when I should be able to change the curve points. Also I want to move an object on that curve as I am doing in my 3rd div.
</p>
<div class="canOuterHdr" >
<canvas id="myCanvas2" width="300" height="195" style="position: relative;">
[No canvas support]
</canvas>
</div>
<div id="slider2" class="newBg">
<input id="slide2" type="range" min="0" max="100" step="1" value="0" onchange="counterSlider('slide2');" />
</div>
</div>
<!-- canHdr2 -->
</div>
<!-- /wrapper -->
<script type="text/javascript">
// newSprite('myCanvas3', 16, 170);
quadraticCurve('myCanvas1', 18.8, 45, 28, 160, 228, 165);
bezierCurve('myCanvas2', 20, 75, 55.2, 150.0, 200,100, 228, 165)
function counterSlider(sID) {
var slideVal = document.getElementById(sID).value;
/*if (maxValue ==100){
slideVal=slideVal/100;
}*/
slideVal = slideVal / 100;
if (slideVal == 0) {
/* erase('myCanvas2');
erase('myCanvas3');
erase('myCanvas4');*/
//newSprite('myCanvas1b', 18.8, 45);
// newSprite('myCanvas3', 16, 170);
} else if (slideVal > 0 && slideVal <= 34) {
/*erase('myCanvas1');
//erase('myCanvas1b');
erase('myCanvas2');
erase('myCanvas3');
erase('myCanvas4');*/
} else if (slideVal > 34 && slideVal <= 67) {
/*erase('myCanvas1');
erase('myCanvas2');
erase('myCanvas3');
erase('myCanvas4');*/
} else if (slideVal > 67 && slideVal <= 100) {
/*erase('myCanvas1');
erase('myCanvas2');
erase('myCanvas3');
erase('myCanvas4');*/
}
}
function erase(canvasId) {
var canvas = document.getElementById(canvasId);
var context = canvas.getContext("2d");
context.beginPath();
context.clearRect(0, 0, canvas.width, canvas.height);
canvas.width = canvas.width;
}
/**********for backgroundImage********************/
function quadraticCurve(canId, spx, spy, cpx, cpy, endx, endy) {
var canvas = document.getElementById(canId);
var ctx = canvas.getContext('2d');
ctx.beginPath();
ctx.moveTo(spx, spy);
ctx.quadraticCurveTo(cpx, cpy, endx, endy);
ctx.strokeStyle = "#eaca2d";
ctx.stroke();
}
function bezierCurve(canId, spx, spy, cpx1, cpy1, cpx2, cpy2, endx, endy) {
var canvas = document.getElementById(canId);
var ctx = canvas.getContext('2d');
ctx.beginPath();
ctx.moveTo(spx, spy);
ctx.quadraticCurveTo(cpx1, cpy1, cpx2, cpy2, endx, endy);
ctx.strokeStyle = "#eaca2d";
ctx.stroke();
}
function newSprite(canId, mvx, mvy) {
var canvas = document.getElementById(canId);
var ctx = canvas.getContext('2d');
ctx.globalCompositeOperation = 'source-over';
//ctx.globalCompositeOperation = "destination-over";
ctx.beginPath();
ctx.fillStyle = "#0077c1";
ctx.arc(mvx, mvy, 6, 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
}
</script>
</form>
</body>
</html>
これは jsfiddle のリンクです: http://jsfiddle.net/Y5yYD/1/