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01 package examples.mouselocation;
02
03 import java.awt.geom.*;
04
05 import fang.*;
06
07 /**Tracks the x and y position of
08 * the mouse on the screen.
09 * @author Jam Jenkins*/
10 public class MouseLocation extends Game
11 {
12 /**the sprite containing the
13 * mouse location string*/
14 private StringSprite locator;
15
16 /**makes and adds the sprites to the screen*/
17 public void setup()
18 {
19 makeSprites();
20 addSprites();
21 setHelp("resources/MouseLocationHelp.txt");
22 }
23 /**makes the mouse locator sprite*/
24 private void makeSprites()
25 {
26 locator=new StringSprite("(0, 0)", true);
27 locator.setHeight(0.05);
28 }
29
30 /**adds the mouse locator sprite to the canvas*/
31 private void addSprites()
32 {
33 addSprite(locator);
34 }
35
36 /**positions the mouse locator at the mouse
37 * position and sets the text to the x and y
38 * location of the mouse*/
39 public void advance()
40 {
41 Location2D location=getMouse2D();
42 String text="("+truncateDecimal(location.x, 2)+
43 ", "+truncateDecimal(location.y, 2)+")";
44 locator.setText(text);
45 locator.setLocation(location.x, location.y);
46 repositionOnScreen();
47 }
48
49 private void repositionOnScreen()
50 {
51 if(locator.getX()-locator.getWidth()/2<0)
52 locator.setX(locator.getWidth()/2);
53 if(locator.getY()-locator.getHeight()/2<0)
54 locator.setY(locator.getHeight()/2);
55 if(locator.getX()+locator.getWidth()/2>1)
56 locator.setX(1-locator.getWidth()/2);
57 if(locator.getY()+locator.getHeight()/2>1)
58 locator.setY(1-locator.getHeight()/2);
59
60 }
61
62 private String truncateDecimal(double x, int places)
63 {
64 String toReturn=""+x;
65 return toReturn.substring(0,
66 Math.min(toReturn.length(), toReturn.indexOf('.')+places+1));
67 }
68
69 public static void main(String[] argv)
70 {
71 new MouseLocation().runAsApplication();
72 }
73 }
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