ADDITIONAL SYSTEM INFORMATION :
Tested under Windows 10 version 1803 with a user defined screen scaling of 125 %.

A DESCRIPTION OF THE PROBLEM :
Graphics.fillRect does not draw when height value is negative and screen scaling is >100 %.

The phenomenon is possibly related to Bug JDK-8203470.

REGRESSION : Last worked in version 8u161

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the code below.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Both rectacles should be visible.
ACTUAL -
The first rectangle (above abscissa) is invisible.

---------- BEGIN SOURCE ----------
import java.awt.*;
import javax.swing.*;

public class InvisibleRectangle extends JFrame {
  public static final long serialVersionUID = 1L;

  public InvisibleRectangle() {
    setSize(400, 300);
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    setVisible(true);
  }


  public static void main(String args[]) {
    SwingUtilities.invokeLater(InvisibleRectangle::new);
  }


  public void paint(Graphics g) {
    g.translate(0, 200);
    g.setColor(Color.BLACK);
    g.drawLine(50,0, 50, -150); // ordinate
    g.drawLine(50,0, 300,0); // abscissa
    g.setColor(Color.BLUE);
    g.fillRect(100,0, 30,-80); // Above abscissa; does not paint.
    g.fillRect(150,0, 30,50); // Below abscissa.
  }

}
---------- END SOURCE ----------

FREQUENCY : always