01
/*
02
 * File: Rainbow.java
03
 * ------------------
04
 * This program displays a rainbow by adding consecutively
05
 * smaller circles to the canvas using an array. 
06
 */
07
 
08
import java.awt.Color;
09
 
10
import acm.graphics.GOval;
11
import acm.graphics.GRect;
12
import acm.program.*;
13
 
14
public class Rainbow extends GraphicsProgram {
15
 
16
 public static final int SUN_RADIUS = 80;
17
 public static final int BAND_WIDTH = 20;
18
 public static final int RAINBOW_OVERHANG = 380;
19
 public static final int RAINBOW_OFFSET = 150;
20
 
21
 public void run() {
22
 
23
// Creating a sky with a GRect method
24
 
25
 drawSky (Color.CYAN);
26
 
27
// Creating a sky with a GOval method
28
// drawCircle (220, 220, 510, Color.CYAN);
29
 
30
 Color[] colors = {Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.BLUE, Color.MAGENTA, Color.CYAN};
31
 
32
 for (int i=0; i<colors.length; i++){
33
 
34
 drawCircle (getWidth()/2, getHeight() + RAINBOW_OFFSET, ((getWidth()+RAINBOW_OVERHANG)/2)-(i*BAND_WIDTH), colors[i]);
35
 
36
 }
37
 
38
// Creating a cute, little sun in the corner using the GOval method
39
 
40
 drawCircle (0, 0, SUN_RADIUS, Color.YELLOW);
41
 
42
 }
43
 
44
 private void drawCircle(int x, int y, int r, Color acolor) { 
45
 
46
 GOval myCircle = new GOval(x-r, y-r, r*2, r*2);
47
 myCircle.setFilled(true);
48
 myCircle.setColor(acolor);
49
 add (myCircle); 
50
 
51
 }
52
 
53
 private void drawSky(Color skycolor) {
54
 
55
 GRect mySky = new GRect(0, 0, getWidth(), getHeight());
56
 mySky.setFilled(true);
57
 mySky.setColor(skycolor);
58
 add (mySky);
59
 }
60
 
61
}
62