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why using translate twice?

Posted on 2010-11-14
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Last Modified: 2013-12-15
 GC gc = e.gc;
  gc.setAdvanced(true);
 
  Bounds b = image.getBounds();

  Transform transform = new Transform(display);
  // The rotation point is the center of the image
  transform.translate(50 + b.width/2, 50 + b.height/2);
  // Rotate
  transform.rotate(45);
  // Back to the orginal coordinate system
  transform.translate(-50 - b.width/2, -50 - b.height/2);
  gc.setTransform(transform);
  gc.drawImage(image, 50, 50);
  transform.dispose();

above the code, a translate method is used twice . why is it used twice??
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Question by:gamjaradio
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6 Comments
 
LVL 92

Expert Comment

by:objects
ID: 34132907
so that it is rotated on the centre of the image
without the translations it would rotate arounf the top left corner of image
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Author Comment

by:gamjaradio
ID: 34133009
hm...
I can not understand..

please , tell me more detaily?
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LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 34133031
1. translates to the centre of image
2. rotate image
3. translate back to top left corner

try it without the translates to see the difference
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Author Closing Comment

by:gamjaradio
ID: 34141546
thanks
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Author Comment

by:gamjaradio
ID: 34142139
can you tell me the meaning of 'translate method'?
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LVL 92

Expert Comment

by:objects
ID: 34142155
shifts points a fixed number of pixels in x and y direction
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