test/jdk/java/awt/geom/Arc2D/Arc2DHitTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 4178123
 * @summary Verifies that the Arc2D.contains(point) methods work correctly.
 * @library /java/awt/regtesthelpers
 * @build PassFailJFrame
 * @run main/manual Arc2DHitTest
 */

import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Panel;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Arc2D;

public class Arc2DHitTest {
    public static void main(String[] args) throws Exception {
        String INSTRUCTIONS = """
            This test displays an arc figure and lets the user click on it.
            The arc will initially be drawn in red and only when the user clicks
            within the arc in the window it will be redrawn into green otherwise
            it should stay red.

            For convenience, the point being tested is drawn in black.  Note
            that rounding in the arc rendering routines may cause points near
            the boundary of the arc to render incorrectly.  Allow for a pixel
            or two of leeway near the boundary.
            """;

        PassFailJFrame.builder()
            .title("Test Instructions")
            .instructions(INSTRUCTIONS)
            .columns(40)
            .testUI(initialize())
            .build()
            .awaitAndCheck();
    }
    private static Frame initialize() {
        Frame f = new Frame("Arc2DHitTest");
        ArcHitPanel panel = new ArcHitPanel();
        f.add(panel);
        f.setSize(300, 250);
        return f;
    }
}

class ArcHitPanel extends Panel {
    private Arc2D arc;
    private Point hit;
    public ArcHitPanel() {
        arc = new Arc2D.Float(10, 10, 100, 100, 0, 120, Arc2D.PIE);
        this.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                hit = e.getPoint();
                repaint();
            }
        });
    }

    @Override
    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        g2.setColor(Color.white);
        g2.fill(g2.getClipBounds());
        g2.setColor((hit != null && arc.contains(hit))
            ? Color.green : Color.red);
        g2.fill(arc);
        if (hit != null) {
            g2.setColor(Color.black);
            g2.fillRect(hit.x, hit.y, 1, 1);
        }
    }
}