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- package l5;
- import java.awt.*;
- import java.applet.*;
- public class ArcTest extends Applet {
- private static final long serialVersionUID = 1L;
- ArcControls controls;
- public void init(){
- setLayout(new BorderLayout());
- ArcCanvas c=new ArcCanvas();
- add("Center", c);
- add("South", controls = new ArcControls(c));
- }
- @SuppressWarnings("deprecation")
- public void start(){
- controls.enable();
- }
- @SuppressWarnings("deprecation")
- public void stop() {
- controls.disable();
- }
- public boolean handleEvent(Event e) {
- if (e.id == Event.WINDOW_DESTROY) {
- System.exit(0);
- }
- return false;
- }
- @SuppressWarnings("deprecation")
- public static void main(String[] args) {
- Frame f= new Frame("ArcTest");
- ArcTest arcTest = new ArcTest();
- arcTest.init();
- arcTest.start();
- f.add("Center", arcTest);
- f.resize(300,300);
- f.show();
- }
- }
- class ArcCanvas extends Canvas {
- private static final long serialVersionUID = 1L;
- int startAngle = 0;
- int endAngle=45;
- boolean filled= false;
- Font font;
- public void paint(Graphics g) {
- @SuppressWarnings("deprecation")
- Rectangle r= bounds();
- int hlines = r.height /10;
- int vlines = r.width /10;
- g.setColor(Color.pink);
- for (int i=1; i<hlines; i++) {
- g.drawLine(0, i*10, r.width, i*10);
- }
- for (int i=1; i<= vlines; i++) {
- g.drawLine(i*10,0,i*10 , r.height);
- }
- g.setColor(Color.red);
- if(filled) {
- g.fillArc(0, 0, r.width -1, r.height - 1, startAngle, endAngle);
- }
- else
- {
- g.drawArc(0, 0, r.width-1, r.height-1, startAngle, endAngle);
- }
- g.setColor(Color.black);
- g.setFont(font);
- g.drawLine(0, r.height/2, r.width, r.height/2);
- g.drawLine(r.width/2, 0, r.width/2, r.height);
- g.drawLine(0, 0, r.width, r.height);
- g.drawLine(r.width, 0, 0, r.height);
- int sx = 10;
- int sy=r.height -28;
- g.drawString("S = " + startAngle, sx, sy);
- g.drawString("E = "+ endAngle, sx, sy+14);
- }
- public void redraw(boolean filled, int start, int end) {
- this.filled = filled;
- this.startAngle = start;
- this.endAngle = end;
- repaint();
- }
- }
- class ArcControls extends Panel {
- private static final long serialVersionUID = 1L;
- TextField s;
- TextField e;
- ArcCanvas canvas;
- public ArcControls (ArcCanvas canvas) {
- this.canvas = canvas;
- add(s = new TextField("0", 4));
- add(e = new TextField("45", 4));
- add(new Button ("Fill"));
- add(new Button ("Draw"));
- }
- public boolean action (Event ev, Object arg) {
- if(ev.target instanceof Button) {
- String label = (String)arg;
- canvas.redraw(label.equals("Fill"),
- Integer.parseInt(s.getText().trim()),
- Integer.parseInt(e.getText().trim()));
- return true;
- }
- return false;
- }
- }
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