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Getting 2 arrays of objects to interact.

[1 Reply]
- 24-Nov-2011 11:51 PM
- Forum: Programming Questions
I'm trying to make a space invaders type program. So I have an array of bullets from the ship and an array of enemies. I have a boolean function in the Bullet class, but I'm not sure how to test it against all of the other enemies. Sorry if this seems confusing. Here's my code. (O line 63, where i wrote " HERE IS WHERE I NEED HELP!!" is where i think i need help. haha)
2. Timer timer;
3. Bullet[] bullets;
4. int xBullet, yBullet;
5. int r;
6. int totalBullets = 0;
7. Enemy[] enemies;
8. int totalEnemies = 0;
10. void setup() {
11. size(600, 600);
12. smooth();
13. background(0);
14. enemies = new Enemy[1000];
15. bullets = new Bullet[5000];
16. timer = new Timer(300); // Create a timer that goes off every 2 seconds
17. timer.start(); // Starting the timer
18. }
20. void draw() {
21. if (frameCount == 10) {
22. // delay(1000);
23. }
25. fill(0, 10);
26. rect(0, 0, 600, 600);
27. //ENEMIES
28. // Check the timer
29. if (timer.isFinished()) {
30. // Deal with enemies
31. // Initialize one enemy
32. enemies[totalEnemies] = new Enemy();
33. // Increment totalEnemies
34. totalEnemies ++ ;
35. // If we hit the end of the array
36. if (totalEnemies >= enemies.length) {
37. totalEnemies = 0; // Start over
38. }
39. timer.start();
40. }
42. // Move and display all enemies
43. for (int i = 0; i < totalEnemies; i++ ) {
44. enemies[i].move();
45. enemies[i].display();
46. }
52. //BULLETS
53. bullets[totalBullets] = new Bullet();
55. if (totalBullets >= bullets.length) {
56. totalBullets = 0;
57. }
59. for (int i = 0; i <= totalBullets; i++) {
60. bullets[i].shoot();
61. bullets[i].display();
62. println("here");
63. if (bullets[i].hit(enemies[HERE IS WHERE I NEED HELP!!])) {
64. println("HIIIIT");
65. }
66. //println(bullets[0].yBullet);
67. }
68. }
70. void keyReleased() {
71. bullets[totalBullets].shoot();
72. totalBullets++;
73. println("keyPressed " + "Bullet #" + totalBullets);
74. }
77. class Bullet {
78. float x, y;
79. float r;
81. Bullet() {
82. y = 580;
83. x = mouseX;
84. r = 5;
85. }
87. void display() {
88. ellipseMode(CENTER);
89. ellipse(x, y, r, r*2);
90. }
92. void shoot() {
93. y -= 10;
94. }
96. // A function that returns true or false based on
97. // if the catcher intersects a raindrop
98. boolean hit(Enemy d) {
99. // Calculate distance
100. float distance = dist(x,y,d.x,d.y);
102. // Compare distance to sum of radii
103. if (distance < r + d.r) {
104. return true;
105. } else {
106. return false;
107. }
108. }
109. }
112. // Learning Processing
113. // Daniel Shiffman
114. // http://www.learningprocessing.com
116. // Example 10-10: The rainEnemy catching game
118. class Enemy {
119. float x,y; // Variables for location of rainEnemy
120. float speed; // Speed of rainEnemy
121. color c;
122. float r; // Radius of rainEnemy
124. Enemy() {
125. r = 8; // All rainEnemys are the same size
126. x = random(width); // Start with a random x location
127. y = -r*4; // Start a little above the window
128. speed = random(1,5); // Pick a random speed
129. c = color(50,100,150); // Color
130. }
132. // Move the rainEnemy down
133. void move() {
134. // Increment by speed
135. y += speed;
136. }
138. // Check if it hits the bottom
139. boolean reachedBottom() {
140. // If we go a little beyond the bottom
141. if (y > height + r*4) {
142. return true;
143. } else {
144. return false;
145. }
146. }
148. // Display the rainEnemy
149. void display() {
150. // Display the Enemy
151. fill(c);
152. noStroke();
153. for (int i = 2; i < r; i++ ) {
154. ellipse(x,y + i*4,i*2,i*2);
155. }
156. }
158. // If the Enemy is caught
159. void caught() {
160. // Stop it from moving by setting speed equal to zero
161. speed = 0;
162. // Set the location to somewhere way off-screen
163. y = - 1000;
164. }
165. }

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