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POWhen Rotating a bitmap it cuts corners off
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  1. POWhen Rotating a bitmap it cuts corners off
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    copied!<p>I rotating some bitmap data in AS3. When ever I start rotating the bitmap the corners get cut off. I'm trying figure out what size the bitmap should be to fit the newly rotated bitmap.</p> <p>The code Im currently using</p> <pre><code>var point:Point=new Point(BMPHolder.x+BMPHolder.width/2,BMPHolder.y+BMPHolder.height/2); var RotateMatrix:Matrix = new Matrix(); var radains:Number = 45 * (Math.PI/180); myMatrix.tx -= point.x; myMatrix.ty -= point.y; myMatrix.rotate(radains); myMatrix.tx += point.x; myMatrix.ty += point.y; preApply = new BitmapData (BMPHolder.width,AdjustY, false); preApply.draw(BMPHolder,myMatrix, null, null, null, false); </code></pre> <p>With the help of the answer i was able to get this working. This is the code I had to add.</p> <pre><code> //Anchor point. xArray.push(0); yArray.push(0); xArray.push((BMPHolder.width * Math.cos(radains)) - (BMPHolder.height * Math.sin(radains))); yArray.push((BMPHolder.width * Math.sin(radains)) + (BMPHolder.height * Math.cos(radains))); xArray.push((BMPHolder.width * Math.cos(radains)) - (BMPHolder.y * Math.sin(radains))); yArray.push((BMPHolder.width * Math.sin(radains)) + (BMPHolder.y * Math.cos(radains))); xArray.push((BMPHolder.x * Math.cos(radains)) - (BMPHolder.height * Math.sin(radains))); yArray.push((BMPHolder.x * Math.sin(radains)) + (BMPHolder.height * Math.cos(radains))); var NewWidth:Number = MaxValue(xArray) - MinValue(xArray); var NewHeight:Number = MaxValue(yArray) - MinValue(yArray); myMatrix.tx -= point.x; myMatrix.ty -= point.y; myMatrix.rotate(radains); myMatrix.tx += Math.abs(NewWidth/2); myMatrix.ty += Math.abs(NewHeight/2); </code></pre> <p>I'm assuming that I could have used the matrix to find all the points but I just did it by hand to keep my sanity. Thanks again</p>
 

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