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2013-09-12T23:34:23.530
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You can use a simple interpolation formula where you animate it by adjusting the factor <code>f</code>. The formula is (shown only for <code>x</code>): <pre><code>x = x1 + (x2 - x1) * f </code></pre> An example on how to implement - <a href="http://jsfiddle.net/AbdiasSoftware/e42k7/" rel="nofollow">AN ONLINE DEMO</a> <pre><code>/// add click callback for canvas (id = demo) demo.onclick = function(e) { /// get mouse coordinate var rect = demo.getBoundingClientRect(), /// gun at center bottom x1 = demo.width * 0.5, y1 = demo.height, /// target is where we click on canvas x2 = e.clientX - rect.left, y2 = e.clientY - rect.top, /// factor [0, 1] is where we are at the line f = 0, /// our bullet x, y; loop(); } </code></pre> Then we provide the following code for the loop <pre><code>function loop() { /// clear previous bullet (for demo) ctx.clearRect(x - 2, y - 2, 6, 6); /// HERE we calculate the position on the line x = x1 + (x2 - x1) * f; y = y1 + (y2 - y1) * f; /// draw some bullet ctx.fillRect(x, y, 3, 3); /// increment f until it's 1 if (f < 1) { f += 0.05; requestAnimationFrame(loop); } else { ctx.clearRect(x - 2, y - 2, 6, 6); } } </code></pre> To draw a "longer" bullet that follows the line you can either store an older value of the x/y pair and draw a line between that and current, or less optimal, calculate the position separately or even calculate the angle and use a fixed length. Also worth to be aware of: the longer the line is the faster the bullet goes. You can calculate a delta value for <code>f</code> based on length (not shown in demo) to get around this.
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1. PODrawing along an equation of a line in HTML5 Canvas
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1. COAmazing! Thanks so much Ken, this is very educational. Let me try it out and understand it.
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