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Beginner having trouble with for loop.

[2 Replies]
- 10-Sep-2011 02:41 PM
- Forum: Programming Questions
I am working on a sketch based on Example 10-10 from the Learning Processing book if anyone is familiar with it. My version creates a number or randomly positioned ellipses. An ellipse is also created at the cursor position. When the ellipse at the cursor touches a random ellipse, it should change color. The problem is that it only works with one of the random ellipses.

The stinker is that if I replace line 23 with:
1. if (circle.intersect(randC[0]) || circle.intersect(randC[1]) || circle.intersect(randC[2])) {
it works how I want it to, the cursor ellipse changes color when it touches any of the random ellipses. Any suggestions would be greatly appreciated. Thanks!
2. Circle circle;
3. randCircle[] randC;
5. int totalCircles = 3;
7. void setup() {
8. size(400, 400);
9. circle = new Circle();
10. randC = new randCircle[totalCircles];
11. for (int i = 0; i < totalCircles; i++) {
12. randC[i] = new randCircle(color(255,0,0));
13. }
14. frameRate = 30;
15. smooth();
16. }
18. void draw() {
19. background(200);
21. for (int i = 0; i < totalCircles; i++) {
22. randC[i].create();
23. if (circle.intersect(randC[i])) {
24. circle.c = 255;
25. } else {
26. circle.c = 0;
27. }
28. }
30. circle.go();
31. }
33. class Circle {
34. float[] xPos;
35. float[] yPos;
36. int drag,c;
37. float r;
39. Circle() {
40. drag = 7;
41. r = 15.5;
42. c = 0;
43. xPos = new float[drag];
44. yPos = new float[drag];
45. for (int i = 0; i < xPos.length; i++) {
46. xPos[i] = 0;
47. yPos[i] = 0;
48. }
49. }
51. float xLoc() {
52. xPos[0] = mouseX;
53. for (int i = xPos.length-1; i >= 1; i--) {
54. xPos[i] = xPos[i-1];
55. }
56. return xPos[xPos.length-1];
57. }
59. float yLoc() {
60. yPos[0] = mouseY;
61. for (int i = yPos.length-1; i >= 1; i--) {
62. yPos[i] = yPos[i-1];
63. }
64. return yPos[yPos.length-1];
65. }
67. boolean intersect(randCircle rC) {
68. float distance = dist(xLoc(),yLoc(),rC.x,rC.y);
69. if (distance < r/2 + rC.r/2) {
70. return true;
71. } else {
72. return false;
73. }
74. }
76. void go() {
77. noStroke();
78. fill(c);
79. ellipse(xLoc(),yLoc(),r,r);
80. }
81. }
83. class randCircle {
84. float r,x,y;
85. color c;
87. randCircle(int c_) {
88. c = c_;
89. r = 15;
90. x = random(width);
91. y = random(height);
92. }
94. void create() {
95. noStroke();
96. fill(c);
97. ellipse(x,y,r,r);
98. }
99. }

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