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CSCI 201 GUIs, Graphics, and Events

CSCI 201 GUIs, Graphics, and Events. Java Graphics (awt). Some AWT components support drawing import java.awt.*; public class ... extends Frame { ... Put drawing code in: public void paint(Graphics g) { ... }. x. 0, 0. y. Hi!. Java Graphics continued. Drawing commands:

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CSCI 201 GUIs, Graphics, and Events

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  1. CSCI 201 GUIs, Graphics, and Events

  2. Java Graphics (awt) • Some AWT components support drawing import java.awt.*; public class ... extends Frame { ... • Put drawing code in: public void paint(Graphics g) { ... } x 0, 0 y

  3. Hi! Java Graphics continued • Drawing commands: g.drawLine(x1, y1, x2, y2); g.drawRect(x, y, width, height); g.drawOval(x, y, width, height); g.fillRect(x, y, width, height); g.fillOval(x, y, width, height); g.setColor(Color.RED); g.drawString("Hi!", x, y);

  4. GUI (= Graphical User Interface) • Components: • new Canvas(); • new Button("click me!"); • new Label ("Hi"); • new Choice(); • new Panel(); • … Use Drawing commands Use “add” to add menu items Use “add” to add other components

  5. Layout Managers • setLayout(new …); • FlowLayout() • add(…); • GridLayout(nrows, ncols) • add(…); • BorderLayout() • add("Center", …); • add("North", …);

  6. Layout Example

  7. Events import java.awt.event.*; public class … implements ActionListener quitButton.addActionListener(this); public void actionPerformed(ActionEvent evt) { if (evt.getSource() == quitButton) { … } }

  8. Applets import java.applet.*; public class MyApplet extends Applet { public void init() { // instead of constructor } } Include in HTML: <applet code="MyApplet.class" width=500 height=400> </applet>

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