graphgui/BasicGUI.java

   1
   2 import javax.swing.SwingUtilities;
   3 import javax.swing.JFrame;
   4 import javax.swing.JPanel;
   5 import javax.swing.BorderFactory;
   6 import java.awt.Color;
   7 import java.awt.Dimension;
   8 import java.awt.Graphics;
   9 import java.awt.Graphics2D;
  10 import java.awt.GradientPaint;
  11 import java.awt.event.MouseEvent;
  12 import java.awt.event.MouseListener;
  13 import java.awt.event.MouseAdapter;
  14 import java.awt.event.MouseMotionListener;
  15 import java.awt.event.MouseMotionAdapter;
  16
  17 public class BasicGUI {
  18
  19     public static void main(String[] args) {
  20
  21         SwingUtilities.invokeLater(new Runnable() {
  22             public void run() {
  23                 createAndShowGUI();
  24             }
  25         });
  26     }
  27
  28     private static void createAndShowGUI() {
  29         JFrame f = new JFrame("Basic GUI #1 - Vertical string of shapes");
  30         f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  31         f.add(new MyPanel());
  32         f.setSize(100,525);
  33         f.setVisible(true);
  34     }
  35
  36 }
  37
  38 class MyPanel extends JPanel {
  39
  40     final int START_X = 10;
  41     final int START_Y = 10;
  42     final int SHAPE_WIDTH = 50;
  43     final int SHAPE_HEIGHT = 40;
  44     final int SHAPE_SPACING = 30;
  45     final int SHAPE_COUNT = 7;
  46
  47     public MyPanel() {
  48         setBorder(BorderFactory.createLineBorder(Color.black));
  49     }
  50
  51     public Dimension getPreferredSize() {
  52         return new Dimension(SHAPE_WIDTH + 2 * START_X,
  53                              SHAPE_COUNT * SHAPE_HEIGHT +
  54                              (SHAPE_COUNT - 1) * SHAPE_SPACING + 2 * START_Y);
  55     }
  56
  57     public void paintComponent(Graphics g) {
  58         final int SHAPE_MID_X = START_X + SHAPE_WIDTH / 2;
  59         GradientPaint gp;
  60
  61         super.paintComponent(g);
  62
  63         Graphics2D g2d = (Graphics2D) g;
  64         Color color1 = getBackground();
  65         Color color2 = color1.darker();
  66
  67         int currY = START_Y;
  68
  69         // Draw vertical string of shapes
  70         for(int i = 0; i < SHAPE_COUNT - 1; i++) {
  71             gp = new GradientPaint(START_X, currY, color1,
  72                                    START_X, currY + SHAPE_HEIGHT, color2);
  73             g2d.setPaint(gp);
  74             g2d.fillRect(START_X, currY, SHAPE_WIDTH, SHAPE_HEIGHT);
  75
  76             g.drawLine(SHAPE_MID_X, currY + SHAPE_HEIGHT,
  77                        SHAPE_MID_X, currY + SHAPE_HEIGHT + SHAPE_SPACING);
  78
  79             currY += SHAPE_HEIGHT + SHAPE_SPACING;
  80         }
  81
  82         // Draw final shape
  83         gp = new GradientPaint(START_X, currY, color1,
  84                                START_X, currY + SHAPE_HEIGHT, color2);
  85         g2d.setPaint(gp);
  86         g2d.fillRect(START_X, currY, SHAPE_WIDTH, SHAPE_HEIGHT);
  87
  88     }
  89 }
  90