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[java] AffineTransform Problem

Started by darkchrono4 Feb 1, 2007 at 9:10 PM 0 replies 700+ views

Original Post

Feb 1, 2007 at 9:10 PM


                AffineTransform saved = g2.getTransform();
		 
		AffineTransform xform = new AffineTransform();	
		
		for (int i=0; i<4; i++) {
			angle = Math.toRadians(i*90);
			g2.setColor(colors);
			xform.setTransform(saved);
			xform.translate(100, 100);
			g2.transform(xform);
			g2.fill(path);
			g2.setColor(Color.BLACK);			
			g2.draw(path);
		}
		
		g2.setTransform(saved);

I would think this code would draw my four shapes one on top of each other. What ends up happening is they seem to be 100 pixels apart from each other. As you can see I get the current matrix before I draw and reload it before I draw each shape so it should be a clear matrix each time. But it acts like its drawing the shape on top of the previous shape matrix.

CaptainJester

101

CaptainJester

Feb 2, 2007 at 6:45 AM

The transform object does not hold the state of the display. It just tells the display to do something. Since you were not resetting the display, you were transforming the display 4 times. Here is what you need.

Graphics2D g2 = (Graphics2D)g;AffineTransform saved = g2.getTransform();         AffineTransform xform = AffineTransform.getTranslateInstance(100, 100);          for (int i=0; i<4; i++) {  angle = Math.toRadians(i*90);  g2.setColor(colors);  g2.transform(xform);  g2.fill(path);  g2.setColor(Color.BLACK);             g2.draw(path);  g2.setTransform(saved);}

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