I'm using OpenJDK 11:
openjdk version "11.0.1" 2018-10-16
OpenJDK Runtime Environment 18.9 (build 11.0.1+13)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.1+13, mixed mode)
Trying to make an app drawing something in JPanel I noticed some annoying inaccuracies.
The following piece of code is supposed to draw a series of lines one below the other (swapping colors are to demonstrate what's happening):
class TestPanel extends JPanel {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
setBackground(Color.WHITE);
g.setColor(Color.RED);
g.drawLine(301, 1, 350, 1);
g.setColor(Color.BLUE);
g.drawLine(301, 2, 350, 2);
g.setColor(Color.GREEN);
g.drawLine(301, 3, 350, 3);
g.setColor(Color.RED);
g.drawLine(301, 4, 350, 4);
g.setColor(Color.BLUE);
g.drawLine(301, 5, 350, 5);
g.setColor(Color.GREEN);
g.drawLine(301, 6, 350, 6);
g.setColor(Color.RED);
g.drawLine(301, 7, 350, 7);
g.setColor(Color.BLUE);
g.drawLine(301, 8, 350, 8);
g.setColor(Color.GREEN);
g.drawLine(301, 9, 350, 9);
g.setColor(Color.RED);
g.drawLine(301, 10, 350, 10);
}
}
However instead of getting lines drawn one below the other there are gaps between some lines:
I suppose this might be caused by something like transformation between a virtual and physical coordinate system.
However how to make it pixel-perfect when preciseness really matters?
