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Make example work on touch screen as well. #9

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Make example work on touch screen as well. #9

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47 changes: 44 additions & 3 deletions lesson11/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,8 @@

<script type="text/javascript">



var gl;

function initGL(canvas) {
Expand Down Expand Up @@ -210,14 +212,27 @@
var moonRotationMatrix = mat4.create();
mat4.identity(moonRotationMatrix);



function handleMouseDown(event) {
mouseDown = true;
lastMouseX = event.clientX;
lastMouseY = event.clientY;
}

function handleTouchStart(evt) {
evt.preventDefault();
var touches = evt.changedTouches;

if (touches.length > 0) {
lastMouseX = touches[0].pageX,
lastMouseY = touches[0].pageY;
}
}



function handleMouseUp(event) {
function handleMouseUpOrTouchEnd(event) {
mouseDown = false;
}

Expand All @@ -229,6 +244,11 @@
var newX = event.clientX;
var newY = event.clientY;

processDrag(newX, newY);

}

function processDrag(newX, newY) {
var deltaX = newX - lastMouseX
var newRotationMatrix = mat4.create();
mat4.identity(newRotationMatrix);
Expand All @@ -243,7 +263,17 @@
lastMouseY = newY;
}

function handleTouchMove(evt) {
evt.preventDefault();
var touches = evt.changedTouches;

if (touches.length > 0) {
var newX = touches[0].pageX;
var newY = touches[0].pageY;
processDrag(newX, newY);
}

}

var moonVertexPositionBuffer;
var moonVertexNormalBuffer;
Expand Down Expand Up @@ -390,6 +420,7 @@
drawScene();
}

var mydiv;

function webGLStart() {
var canvas = document.getElementById("lesson11-canvas");
Expand All @@ -402,12 +433,20 @@
gl.enable(gl.DEPTH_TEST);

canvas.onmousedown = handleMouseDown;
document.onmouseup = handleMouseUp;
document.onmouseup = handleMouseUpOrTouchEnd;
document.onmousemove = handleMouseMove;

el = document.getElementById('mydiv');
el.addEventListener("touchstart", handleTouchStart, false);
el.addEventListener("touchend", handleMouseUpOrTouchEnd, false);
el.addEventListener("touchcancel", handleMouseUpOrTouchEnd, false);
el.addEventListener("touchleave", handleMouseUpOrTouchEnd, false);
el.addEventListener("touchmove", handleTouchMove, false);

tick();
}


</script>


Expand All @@ -417,7 +456,9 @@
<body onload="webGLStart();">
<a href="http://learningwebgl.com/blog/?p=1253">&lt;&lt; Back to Lesson 11</a><br />

<canvas id="lesson11-canvas" style="border: none;" width="500" height="500"></canvas>
<div id="mydiv">
<canvas id="lesson11-canvas" style="border: none;" width="500" height="500"></canvas>
</div>
<br/>

<input type="checkbox" id="lighting" checked /> Use lighting<br/>
Expand Down