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174 lines
5.5 KiB
HTML
174 lines
5.5 KiB
HTML
<!DOCTYPE html>
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Lab Aide
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<main class="main-content">
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<article class="article">
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<h1>Lecture for November 20</h1>
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<h2>Adding a drawing panel to the GUI</h2>
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<p>You can't put swing and graphics together, therefore you need to make a seperate JPanels for swing and graphics.</p>
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<p>Add necessary libraries</p>
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<pre><code class="language-java">import java.awt.*;
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import java.awt.Graphics;
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import java.awt.event.*;
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import javax.swing.*;</code></pre>
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<pre><code class="language-java">public class drawingWindow extends JPanel {
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JTextField field;
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JButton draw;
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DrawingPanel drawingPanel;
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public drawingWindow() {
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// Each new component would be vertically stacked upon each other
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setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
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JPanel swingSTuff = new JPanel();
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// Add things to the screen
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draw = new JButton("Draw");
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field = new JTextField();
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swingStuff.add(field);
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swingStuff.add(draw)
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// Add the drawing panel onto the screen
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drawingPanel = new DrawingPanel(200, 400);
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add(drawingPanel);
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// Activate the listener if the button was pressed
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draw.addActionListener(new Listener());
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}
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// Add the listener to respond to events
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private class listener implements ActionListener {
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public void actionPerformed(ActionEvent event) {
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if (event.getSource() == draw) {
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drawingPanel.setFlag(1);
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// Repaints the screen so the oval can appear
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drawingPanel.repaint();
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}
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}
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}
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// Create the draw panel so we can add it to the screen
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private class DrawingPanel extends JPanel {
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private int width, height;
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DrawingPanel(int width, int height) {
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this.width = width;
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this.height = height;
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setPreferredSize(new Dimension(width, height));
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}
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public void setFlag(int flag) {
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this.flag = flag;
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}
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public void paintComponent(Graphics g) {
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super.paintComponent(g);
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// Every time the flag is set, draw an oval at a random location and color
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if (flag == 1) {
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Random rand = new Random();
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int x = rand.nextInt(width);
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int y = rand.nextInt(height);
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g.setColor(Color.RED);
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g.fillOval(x, y, 20, 30);
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}
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}
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}
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}</code></pre>
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<p>There are a myriad of different methods you can use. </p>
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<pre><code class="language-java">// Assume width, height, y, x, etc are defined above
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public void paintComponent(Graphics g) {
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//....
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g.dispose(); // Flushes the graphics buffer
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}</code></pre>
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<p>You have the traditional fill and draw methods. Fill creates the shape shaded in with a color. Draw creates an outline of the shape.</p>
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<pre><code class="language-java">
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// ...
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g.fillRect(x ,y, width, height);
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g.drawRect(x, y, width, height);
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g.fillOval(x, y, width, height);
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g.drawOval(x, y, width, height);
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//g.drawPoly(parematers...);
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//g.fillPoly(parameters...);
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g.drawArc(x, y, width, height, startingAngle, sweepingAngle);
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g.fillArc(x, y, width, height, startingAngle, sweepingAngle);</code></pre>
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<p>You can also create complex shapes like a polygon. When adding points, you need to make sure you add them Clockwise or Counterclockwise (but NOT both)</p>
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<pre><code class="language-java"> Polygon tri = new Polygon();
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tri.addPoint(150, 10);
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tri.addPoint(175, 100);
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tri.addPoint(125, 100);
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// Add points clockwise or counterclockwise (NOT BOTH)</code></pre>
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