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reach an item in array

[2 Replies]
- 26-Sep-2012 02:25 PM
- Forum: Programming Questions
Hi everybody

i am trying to reach a certain item in an array.

For exemple, my array display 10 ball and i want the ball n°2 to be fill with a different color
4. //Declare
7. Ball [] ballCollection = new Ball[200];
9. void setup(){
10. size(600,600);
11. smooth();
13. //Initialize
14. for( int i = 0 ; i < ballCollection.length ; i ++){
15. ballCollection[i] = new Ball(random(0,width),random(0,200));
16. }
17. }
19. void draw(){
20. background(0);
22. //Call Functionality
23. for( int i = 0 ; i < ballCollection.length ; i ++){
24. ballCollection[i].run();
26. // stroke (255,0,0);
27. // ballCollection[5].run();
28. // noStroke();
29. }
32. }
36. // and the class
37. class Ball {
38. // Global variables
39. float x = 0;
40. float y = 0;
41. float speedX = random(-4,4);
42. float speedY = random(-1,1);
44. // Constructor
45. Ball(float _x, float _y) {
46. x = _x;
47. y = _y;
48. }
51. //Functions
52. void run() {
53. // fill(random(0,255),0,0);
54. display();
55. move();
56. bounce();
57. gravity();
58. }
61. void gravity() {
62. speedY += 0.2;
64. }
67. void bounce() {
68. if (x > width) {
69. speedX = speedX *-1;
70. }
71. if (x < 0) {
72. speedX = speedX *-1;
73. }
75. if (y > height) {
76. speedY = speedY *-1;
77. }
78. if (y<0 ) {
79. speedY = speedY *-1;
80. }
81. }
83. void move() {
84. x += speedX;
85. y += speedY;
86. }
88. void display() {
90. ellipse(x, y, 20, 20);
91. }
92. }
the three commented line is one of my attempt to do it. Any clue ?

Thank you !

moving object with 3D view

[5 Replies]
- 13-Sep-2012 09:30 AM
- Forum: Programming Questions
Hi everybody.

I am currently trying to write a script to draw an abstract stairs.

I am using rectangle as a step, this rectangle is moving in x or y.

Every step, the rectangle is tranlslated in z to climb.

It works fine when I look from the top ( example 01), but when i use something like peasy cam to move around the stairs, the x,y,z system seems to be reboot for every view...

In the other hand, failed to replace the move with a translate ( example 02) ... any clue do use translate correctly ?

Thanks !

EXAMPLE 01 :
1. int x = 100; // position en x de la marche
2. int y = 100; // position en y de la marche
3. int R = 20; // dimensions de la marche
4. int m = R; //mouvement
5. int mx; // mouvement en X
6. int my; // mouvement en Y
7. int cm = 10; //contremarche
8. int mz; // mouvement en Z
10. // ...
11. void setup() {
12. size (600, 600, P3D);
14. background(0);
15. frameRate(5);
16. }
18. void draw () {
19. climb();
21. display();
23. //bounce();
24. }
26. void climb () {
28. mx = m*round(random(0, 1));
29. x = x + mx;
30. if (mx > 0) {
31. my = 0;
32. }
33. else {
34. my = m;
35. }
36. y = y + my;
37. }
39. void display() {
41. translate (0, 0, mz);
42. mz = mz+cm;
43. rect (x, y, R, R);
45. }
EXAMPLE 02
1. int x = 200; // position en x de la marche
2. int y = 200; // position en y de la marche
3. int R = 20; // dimensions de la marche
4. int m = R; //mouvement
5. int mx; // mouvement en X
6. int my; // mouvement en Y
7. int cm = 10; //contremarche
8. int mz; // mouvement en Z
10. // ...
11. void setup() {
12. size (600, 600, P3D);
14. background(0);
15. frameRate(5);
16. }
18. void draw () {
19. climb();
21. display();
23. //bounce();
24. }
26. void climb () {
28. mx = m*round(random(0, 1));
29. if (mx > 0) {
30. my = 0;
31. }
32. else {
33. my = m;
34. }
35. pushMatrix();
36. translate (mx,0,0);
37. translate (0,my,0);
38. translate (0,0,mz);
39. mz = mz+cm;
40. rect (x, y, R, R);
41. popMatrix();
42. }
44. void display() {
47. }

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