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Gravity and platforms

[11 Replies]
- 30-May-2013 06:37 PM
- Forum: Programming Questions
Hello everyone, I have a little question about basic gravity and platforms.
In my programs, there's two squares : player and enemy. There is also a bunch of platforms, "solid" structures that no object is supposed to pass by.

Here are my problems :
- I just don't know how to come up with a basic gravity feature. I guess there is a force that pulls down the objets and jumping, for example, is just "going against" that force?

- I managed to "detect" if one square is over a platform, but I don't know how to make the platform "solid" as in : the animated objets cannot go into that part of the screen.

Here's my code, I hope you guys can help me.

Also, any comment on my code or problems with it will be more than welcome.

Thanks!
The code is divided in two parts. Main and Classes.
Player myPlayer;

Enemy myEnemy;

Platform [] myPlats = new Platform [6];

void setup() {

//boolean lost = false;

noSmooth();

size(600, 600);

frameRate(60);

background(255);

myPlayer = new Player(300, 570);

myEnemy = new Enemy(100, 100, 20, 20);

myPlats [0] = new Platform(0, 170, 220, 10);

myPlats [1] = new Platform(380, 170, 220, 10);

myPlats [2] = new Platform(150, 290, 300, 10);

myPlats [3] = new Platform(0, 410, 220, 10);

myPlats [4] = new Platform(380, 410, 220, 10);

myPlats [5] = new Platform(0, 590, 600, 10);

}

void draw() {

background(255);

for (int i = 0; i < myPlats.length; i++) {

myPlats[i].drawPlatform();

}

myEnemy.run();

myPlayer.run();

}

//Classes

//Classes

//The Player and the enemy are a class

float posX = 0;

float posY = 0;

float wX = 20;

float hX = 20;

float speed = 5;

float gravity = 0.2;

class Player {

//GLOBAL VARIABLES

//CONSTRUCTOR

Player(float _posX, float _posY) {

posX = _posX;

posY = _posY;

}

//FUNCTIONS

void run() {

display();

//collision();

//vibration();

System();

pMovement();

}

void display() {

noStroke();

fill(0);

rect(posX, posY, wX, hX);

}

//Ugghh...

void vibration() {

if (!keyPressed) {

posY = posY + random(-1, 1);

}

}

void pMovement() {

//First condition, not sure about it

// if ((((posX <=width) && posX >= 0)) && ((posY <=height) && (posY >=0))) {

{

if (keyPressed && keyCode == LEFT) {

posX = (constrain(posX-speed, 0, 600));

}

if (keyPressed && keyCode == RIGHT) {

posX = (constrain(posX+speed, 0, 580));

}

}

}

// }

void System() {

boolean collision = rectangle_collision(posX, posY, wX, hX, posEx, posEy, wEx, hEy);

if (collision) {

posX +=random(-3, 3);

fill(255, 0, 0, 125);

rect(0, 0, 1000, 1000);

fill(255);

stroke(255);

text("---------------------", width/2, height/2, 100, 100);

;

}

}

boolean rectangle_collision(float posX, float posY, float wX, float hX, float posEx, float posEy, float wEx, float hEy)

{

return !(posX > posEx+wX || posX+wX < posEx || posY > posEy+hEy || posY+hX < hEy);

}

}
//Enemy

float posEx = 0;

float posEy = 150;

float wEx = 20;

float hEy = 20;

class Enemy {

// Constructor

Enemy(float _posEx, float _posEy, float _wEx, float _hEy) {

posEx = _posEx;

posEy = _posEy;

wEx = _wEx;

hEy = _hEy;

}

float enSpeed = 5;

float gravity = 1;

void run() {

display();

movement();

// gravity();

}

void display() {

fill(255, 20, 20);

rect(posEx, posEy, 20, 20);

}

void movement() {

gravity();

posEx += enSpeed;

if ((((posEx >=585) || posEx <= 0)))

enSpeed = 0;

if (((posEy >=570) || (posEy <=0))) {

enSpeed = 0;

}

}

void gravity() {

posEy += gravity;

}

}

//Controls of enemy, if needed

/*

if (keyPressed && keyCode == LEFT) {

posEx = (constrain(posEx-enSpeed, 0, 600));

}

if (keyPressed && keyCode == RIGHT) {

posEx = (constrain(posEx+enSpeed, 0, 580));}

if (keyPressed && keyCode == UP) {

posEy = posEy-enSpeed;}

if (keyPressed && keyCode == DOWN) {

posEy = posEy+enSpeed;}

*/

// CHANGE CONTROLS FOR ENEMY.

// CHECK BOUNDERIES, SINCE THEY'RE NOT WORKING AT ALL FOR ENEMY

class Platform {

float xPos;

float yPos;

float platWidth;

float platHeight;

Platform(float x, float y, float w, float h) {

xPos = x;

yPos = y;

platWidth = w;

platHeight = h;

}

void drawPlatform() {

collisionEn();

displayPlat();

// collisionPlay();

}

void displayPlat() {

fill(0);

rect(xPos, yPos, platWidth, platHeight);

}

void collisionEn() {

for (int i = 0; i < myPlats.length; i++) {

if (posEx > myPlats[i].xPos

&& posEx+wEx > myPlats[i].xPos

&& posEx+wEx < myPlats[i].xPos + myPlats[i].platWidth

&& posEx < myPlats[i].xPos + myPlats[i].platWidth

&& posEy > myPlats[i].yPos

&& posEy < myPlats[i].yPos + myPlats[i].platHeight

&& posEy+hEy > myPlats[i].yPos

&& posEy+hEy < myPlats[i].yPos + myPlats[i].platHeight)

rect(0, 0, 1000, 1000);

}

}

// void collisionPlay(){

// for (int i = 0; i < myPlats.length; i++) {

// if (((posX > myPlats[i].xPos) && (posX < myPlats[i].xPos + myPlats[i].platWidth)) && ((posY > myPlats[i].yPos) && (posY < myPlats[i].yPos + myPlats[i].platHeight)))

// rect(0,0,1000,1000);}}

}

Detecting if SquareA is colliding with SquareB

[3 Replies]
- 31-Mar-2013 11:09 AM
- Forum: Programming Questions
Hello everyone!

I started learning Processing two days ago and I'm experimenting quite a bit. So far, I'm loving it. I've been trying to make a little program where the user can control a square (SquareA) and when he collides with SquareB, the screen goes all red.

I managed to program a very primitive form of collision, but it only takes in account SquareB's corner (I'm comparing the coordinates of both squares to generate a big, red rect() that would cover the whole screen.

I think the logic is kind of there, but I would need to find a way to take in account all the points in both squares and compare them. I don't know how to do this yet and there's where I would need some help. My idea, for the moment, is to find a way to calculate the squares areas to know which coordinates they're occupying and then comparing them. But this seems kind of complicated, I'm sure there's another way that I don't know yet.

Any pointers for syntax and those kind of things will be appreciated too.

Here's a screenshot, for visual reference.

Here's the code.
2. void setup(){
3. size(500,500);
4. frameRate(60);
5. background(255);
6. smooth();
7. }
9. //Positions
10. int posX = 250;
11. int posY = 250;
13. int posEx = 200;
14. int posEy = 100;
16. //Function to call "SquareB"
17. void enemy() {
18. fill(255,8,8);
19. rect(posEx,posEy,50,50);
20. }
23. //Moving SquareA
24. void keyPressed() {
25. background(255);
26. print("PosX:"); println(posX);
27. print("PosY:"); println(posY);
28. print("PosEx:"); println(posEx);
29. print("PosEy:"); println(posEy);
30. println("------------");
31. if (key ==CODED){
32. if (keyCode==DOWN)
33. posY = posY+10;
34. else if (keyCode==LEFT)
35. posX = posX-10;
36. else if (keyCode==RIGHT)
37. posX = posX+10;
38. else if (keyCode==UP)
39. posY = posY-10;
40. }
41. }
43. //Here is where my problem is, I think
44. void draw(){
45. noStroke();
46. fill(2);
47. rect(posX,posY,20,20);
48. enemy();
49. if ((posX==posEx) && (posY==posEy)){
50. fill(255,8,8);
51. rect(0,0,5000,1000);
52. }}

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