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POdetecting touch for bitmap that's been drawn with Rect transformations
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  1. POdetecting touch for bitmap that's been drawn with Rect transformations
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    copied!<p>For Bitmaps drawn with simple (x,y) coordinates, </p> <pre><code>float _x = x - (bitmap.getWidth() / 2); float _y = y - (bitmap.getHeight() / 2); canvas.drawBitmap(bitmap, _x, _y, null); </code></pre> <p>I can <a href="https://stackoverflow.com/questions/2447564/detect-touch-on-bitmap/2447665#2447665">detect if the bitmap has been touched</a>.</p> <p>I'm drawing a bitmap to the screen with</p> <pre><code> dest = new Rect(0,0,0,0); src = new Rect(0,0,0,0); mSpriteHeight = (int) (sprite_pixel_height * mScale + 0.5f); mSpriteWidth = (int) (sprite_pixel_width * mScale + 0.5f); src.top = 0; src.left = 0; src.bottom = mSpriteHeight; src.right = mSpriteWidth; dest.top = (int) (_x * mScale); dest.bottom = (int) ((_x + mSpriteHeight) * mScale); dest.left = (int) (_y * mScale); dest.right = (int) ((_y + mSpriteWidth) * mScale); canvas.drawBitmap(bitmap, src, dest, null); </code></pre> <p>trying to incorporate the <a href="https://stackoverflow.com/questions/4146328/android-drawbitmap-in-dip/4146430#4146430">screen density</a> because <a href="http://developer.android.com/reference/android/graphics/Canvas.html#drawBitmap%28android.graphics.Bitmap,%20android.graphics.Rect,%20android.graphics.Rect,%20android.graphics.Paint%29" rel="nofollow noreferrer">"This function ignores the density associated with the bitmap. ... so must already have the appropriate scaling factor applied."</a> </p> <p>I haven't been able to detect touches to the translated bitmaps. I must need to do a similar translation using <code>mScale</code>, but I'm lost.</p> <p><strong>Is there a better way to define the src and dest</strong> in my original <code>canvas.drawBitmap(bitmap, src, dest, null);</code>?</p> <p>Anyone know an example where this has been done? I can't seem to find the right search terms to find such an example.</p>
 

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