AffineTransform: how to scale only one shape Triangle
I have this code:
import javax.swing.*; import java.awt.*; public class Test { public static void main(String[] args) { JFrame window = new JFrame(); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setBounds(30, 30, 300, 300); window.getContentPane().add(new MyCanvas()); window.setVisible(true); } } class MyCanvas extends JComponent { public void paint(Graphics g) { g.drawRect (10, 10, 100, 100); Polygon triangle = new Polygon(new int[] {100, 150, 200}, new int[] {200, 100, 200}, 3); g.drawPolygon(triangle); } } It draws this:
I want to scale only Triangle, so it becomes thrice is big:
I understand that I need to use AffiniteTransform, but I don’t understand how.
I only know that I need the scaling instance:
AffineTransform at = AffineTransform.getScaleInstance(3, 3); All answers I’ve seen were very confusing or just used g2d.setTransform(at) which doesn’t seem to be what I need, seeing as the square is supposed to stay the same size.
EDIT: And how do I scale a Triagle, while keeping its leftmost coordinate at the same location? (leftmost (x,y) stays the same)
New code:
public class Test { public static void main(String[] args) { JFrame window = new JFrame(); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setBounds(30, 30, 300, 300); window.getContentPane().add(new MyCanvas()); window.setVisible(true); } } class MyCanvas extends JComponent { public void paint(Graphics g) { g.drawRect (10, 10, 100, 100); Polygon triangle = new Polygon(new int[] {100, 150, 200}, new int[] {200, 100, 200}, 3); AffineTransform at = AffineTransform.getScaleInstance(1.5, 1.5); ((Graphics2D) g).setTransform(at); g.drawPolygon(triangle); ((Graphics2D) g).setTransform(AffineTransform.getScaleInstance(1,1)); validate(); } } gives this:
The triangle shifts as it gets scaled.
Is it possible to keep the triangle at the same spot – that is to keep its leftmost bottom corner at the same spot?
