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Creating multiple instances of a class (fish) following different instances of a ball class

[1 Reply]
- 25-Sep-2012 09:56 PM
- Forum: Programming Questions
okay so yeah. I've been picking code and hacking things together, but I've got this app that is under construction.
I've gotten one instance of this fish class to follow one instance of the ball class, but was curious as to how I could populate more fish following more balls.

i.e, fish 1 following ball 1, fish 2 following ball 2, etc.

Then again, I'm probably going about this in a really bulky way, and there's probably a better way to get the same behavior, but for now, I'd just like some help trying to get this to work.

so the code is as follows.
2. Fish fish1;
3. Ball ball;
4. Rain rain;
6. float ballx,bally; // location
7. float[] xpos = new float[15];
8. float[] ypos = new float[15];
9. int[] rainXpos = new int[90];
10. int[] rainYpos = new int[90];
13. float circlex=150;
14. float circley=150;
16. //------------------SETUP-------------------
17. void setup(){
18. size(1024,768);
19. background(136,216,247);
20. smooth();
22. //Call Families
23. rain = new Rain();
24. ball = new Ball(1);
25. fish1 = new Fish();
28. //Setup Rain
29. for (int c = 0; c < rainXpos.length; c++)
30. {
31. rainXpos[c] = 0;
32. rainYpos[c] = 0;
33. }
35. //Fish
36. for (int i = 0; i < xpos.length; i++)
37. {
38. xpos[i]= 0 ;
39. ypos[i]= 0 ;
40. }
43. }
44. //-------------------DRAW--------------------
45. void draw(){
46. background (168,225,247);
48. rain.draw();
49. fish1.display(width/2, height/2);
50. ball.move();
51. ball.display();
53. }
Ball class:
2. class Ball {
4. float r; // radius
6. float speedx,speedy; // speed
8. // Constructor
9. Ball(float tempR) {
10. r = tempR;
11. ballx = random(width);
12. bally = random(height);
13. speedx = random( - 5,5);
14. speedy = random( - 5,5);
15. }
17. void move() {
18. ballx += speedx; // Increment x
19. bally += speedy; // Increment y
21. // Check horizontal edges
22. if (ballx > width || ballx < 0) {
23. speedx *= - 1;
24. }
25. //Check vertical edges
26. if (bally > height || bally < 0) {
27. speedy *= - 1;
28. }
29. }
31. // Draw the ball
32. void display() {
33. fill(136,216,247);
34. ellipse(ballx,bally,r*2,r*2);
35. }
36. }
Fish Class:
2. class Fish {
4. float xspeed;
5. float yspeed;
6. float mov = 0;
7. float mi = 0.1;
10. void display(int x, int y){
12. //Lilypad Following
13. if (mousePressed == true) {
15. mov = mov + mi ;
18. if (mov > .4 || mov < -.4) {mi = mi * -1; }
20. xspeed = (((mouseX-circlex))/120);
21. yspeed = (((mouseY-circley))/120);
22. circlex += xspeed + mov/2;
23. circley += yspeed + mov;
25. if (circlex > width) {circlex=width;}
26. if (circley >height) {circley=height;}
30. for (int i = 1; i<xpos.length-1; i++){
33. xpos[i] = xpos[i+1];
34. ypos[i] = ypos[i+1];
36. }
37. }
38. //end mousepressed
39. //Maxe this follow ballx, bally
40. else {
41. mov = mov + mi ;
44. if (mov > .4 || mov < -.4) {mi = mi * -1; }
46. xspeed = (((ballx-circlex))/150);
47. yspeed = (((bally-circley))/150);
48. circlex += xspeed + mov/2;
49. circley += yspeed + mov;
51. if (circlex > width) {circlex=width;}
52. if (circley >height) {circley=height;}
56. for (int i = 1; i<xpos.length-1; i++){
59. xpos[i] = xpos[i+1];
60. ypos[i] = ypos[i+1];
62. }
63. }
66. xpos[xpos.length-1] = circlex;
67. ypos[ypos.length-1] = circley;
69. for (int i =0;i < xpos.length; i++)
70. {
71. noStroke();
72. fill(2,51,59);
73. ellipse(xpos[i],ypos[i],((xpos.length)/3.5)-i,((xpos.length)/2)-i);
74. }
76. }
78. }
Rain Class:
2. class Rain {
4. void draw()
5. {
7. fill(0);
8. rainXpos[rainXpos.length-1] = int(random(1,width));
9. rainYpos[rainYpos.length-1] = int(random(1,height));
11. for (int c =0; c < rainXpos.length -1 ; c++)
12. {
13. rainXpos[c]=rainXpos[c+1];
14. rainYpos[c]=rainYpos[c+1];
15. }
17. for (int c =0; c< rainXpos.length; c++)
18. {
19. stroke(255,255,255,c);
20. noFill();
21. ellipse(rainXpos[c],rainYpos[c],90-c,90-c);
22. }
24. }
26. }

Cannot make static reference to non-static error when placing a class at mouseX

[3 Replies]
- 18-Sep-2012 11:00 PM
- Forum: Programming Questions
So I'm developing an ant simulator, and having minor issues with placing a class at mouseXmouseY on mousePressed.
I'm getting the "Cannot make a static reference to the non-static method" error, and was wondering if someone could help me with it. I know its a really simple error to fix, but for some reason, I'm having trouble getting it to place and i'm getting frustrated.
2. int antNum = 10; // Set the number of ants
3. int faderate = 2; // Set background redraw opacity
4. Ant[] antList; // Create a list to hold the ants
7. void setup(){
8. size(500,500);
9. background(255);
10. smooth();
12. //Make a list of ants
13. antList = new Ant[antNum];
15. //Make a bunch of ants and put them in the ant list
16. for (int i = 0; i < antNum; i ++){
17. Ant put = new Ant();
18. put.x = width/2;
19. put.y = height/2;
20. put.speed = 3;
21. put.antSize = 5;
23. antList[i] = put;
25. }
29. }
31. void draw(){
32. fill(255,255,255,faderate); //Rectangle fadeaway
33. rect(0,0,width, height);
34. for (int i =0; i <antNum; i ++) {
35. Ant currentAnt = antList[i];
36. currentAnt.walk();
37. }
41. }
42. //Place Food
43. void mousePressed() {
44. Food.addFood(mouseX,mouseY);
46. }
49. //Saves a screenshot of the ants
50. void keyPressed() {
51. if (key== 's'){
53. save(month()+":"+day()+":"+year()+"_"+hour()+"."+minute()+"."+second()+"_"+"ants.png");
54. }
55. }
and the code for the "food" class is:
2. class Food {
4. float range = 25;
6. Food(){
8. }
10. void addFood(int x, int y){
11. //Draw the food
12. fill(255,69,0,25);
13. noStroke();
14. rectMode(CENTER);
15. rect(mouseX,mouseY,8,8);
17. }
19. }
I know its a dumb problem to be having, but rawr.
If you wanted the ant class too, just to see how this actually runs:
2. class Ant {
4. float x;
5. float y;
6. float speed = 1;
7. float antSize = 1;
10. Ant(){
13. }
15. void walk(){
16. //Update the position
17. x = x + random(-speed, speed);
18. y = y + random(-speed,speed);
20. //Draw the ant
21. fill(0,0,0);
22. noStroke();
23. ellipse(x,y,antSize/1.5,antSize/1.5);
26. //Bounding box
27. if (x < 0) {
28. x = 0;
29. }
30. if (y < 0) {
31. y = 0;
32. }
33. if (x > width) {
34. x = width;
35. }
36. if (y > height) {
37. y = height;
38. }
42. }
44. }

How to remove all instances of a class on keypress

[1 Reply]
- 06-Sep-2012 08:59 PM
- Forum: General Discussion
I'm a little new to processing, and I've been tweaking and optimizing the basic ant colony pheromone simulation (http://www.openprocessing.org/sketch/15109) But i'm having an issue with the Food class.

Ideally, I would want to be able to rightclick or something on an area and be able to clear any food in a 20 pixel radius, but I would settle for all instances of the food to be cleared when I hit the spacebar.

I can't get that to work and I am frustrated.. Can anyone offer me some help?

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