79 lines
1.7 KiB
Java
79 lines
1.7 KiB
Java
/* this class allows interactive
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viewing of a tree built from
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Node instances
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*/
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import java.awt.*;
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import java.awt.event.KeyEvent;
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public class TreeViewer extends Basic
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{
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// instance variables for the application:
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// vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
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private Node root; // root of tree to be viewed
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private String keyInput;
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private double horizGap = 2, vertGap = .5;
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// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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public TreeViewer( String title, int ulx, int uly, int pw, int ph,
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Node tree )
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{
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super(title,ulx,uly,pw,ph);
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setBackgroundColor( new Color( 128, 128, 200 ) );
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// tree display
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cameras.add( new Camera( 25, 45, pw-55, ph-75,
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0, 10, 0, 5,
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new Color( 200, 200, 200 ) ) );
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root = tree;
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super.start();
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}
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public void step()
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{
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// tree display
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Camera cam = cameras.get(0);
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cam.activate();
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cam.setColor( Color.black );
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root.draw( cam, 5.0, 4.0, horizGap, vertGap );
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}// step
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public void keyTyped( KeyEvent e ) {
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char key = e.getKeyChar();
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if( key == 'w' ){
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horizGap *= 1.2;
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}
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else if( key == 'n' ){
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horizGap /= 1.2;
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}
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}// keyTyped
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public void keyPressed( KeyEvent e ) {
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int code = e.getKeyCode();
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if( code == KeyEvent.VK_LEFT ){
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cameras.get(0).shiftRegion( -0.25, 0 );
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}
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else if( code == KeyEvent.VK_RIGHT ){
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cameras.get(0).shiftRegion( 0.25, 0 );
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}
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else if( code == KeyEvent.VK_UP ){
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cameras.get(0).shiftRegion( 0, 0.25 );
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}
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else if( code == KeyEvent.VK_DOWN ){
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cameras.get(0).shiftRegion( 0, -0.25 );
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}
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}// keyPressed
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}// TreeViewer
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