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POhtml5 canvas using sprite
 

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  1. POhtml5 canvas using sprite
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    <p>I want to use a sprite in an html5 canvas context.</p> <p>i want to drag it with my mouse.. so the displayed area changes while dragging the mouse.</p> <p>It should look like a window with width: 21 and height: 90, where just a part of the sprite is visible. when i drag the sprite downwards or upwards i want the visible part to change.</p> <p>I thought i can do this with the drawImage (slice) method, but it doesnt work how i want...</p> <p>Can you please help me out?</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script type="text/javascript"&gt; var y = 30; var canvas; var context; var imageHours; function clearClock(context) { context.clearRect(0, 0, 300, 500); } function init(){ canvas = document.getElementById("uhr"); context = canvas.getContext("2d"); imageHours = new Image(); imageHours.src = "07.png"; context.drawImage(imageHours, 0, y, 21, 90, 50, 50, 21, 90); var down = false; canvas.addEventListener('mousedown', function(event) { down = true; }, false); canvas.addEventListener('mouseup', function() { down = false; }, false); canvas.addEventListener('mousemove', function(event){ if(down){ if(event.layerY &gt; 50 &amp;&amp; event.layerY &lt; 140){ y = event.layerY; } clearClock(context); context.drawImage(imageHours, 0, y, 21, 90, 50, 50, 21, 90); } }, false); } &lt;/script&gt; &lt;/head&gt; &lt;body onload="init();"&gt; &lt;canvas id="uhr" height="500px" width="300px"/&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Sprite: <img src="https://i.stack.imgur.com/hD1Ij.png" alt="Sprite:"></p> <p>EDIT: i added a comment to my mainPost. the reason why i am trying to acomplish this like that is.. that i dont want to use a library for this.. because i want to learn such stuff... using libraries doesnt help me with learning...</p>
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    1. USkrackmoe
    1. USkrackmoe
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      1. VTUpMod
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    1. COConsider making a [fiddle](http://jsfiddle.net/ult_combo/9S2Td/) next time, it'll be easier to debug it immediately then.
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      1. USFabrício Matté
    2. CO`But it doesn't work how I want.` Well, how do you want it?
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      1. USSome Guy
    3. CONow when i am using the drawImage method it acts as follow: when i slide the mouse up the list slides up, when i slide down with the mouse the digits get bigger, which i dont want... i just want to drag the digits from top to down or otherwise round... like a spinner, i grab at a position and from there on i drag it..
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      1. USkrackmoe
 

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