| why a translate method is used twice? [message #639038] |
Sun, 14 November 2010 19:16  |
Eclipse User |
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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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| Re: why a translate method is used twice? [message #639040 is a reply to message #639038] |
Sun, 14 November 2010 20:02  |
| Eclipse User |
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Tom,
Comments below.
tom wrote:
> 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??
Think of how differently a rotation would behave for a circle if that
circle where at the origin (nothing would change) verses if it's not at
the origin (it would actually rotate around the original).
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