Processing 1.0 - Processing Discourse - How to collect objects in a minigame?

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How to collect objects in a minigame? (Read 593 times)

RaG

How to collect objects in a minigame?
Dec 5^th, 2009, 2:37am

Hi there!
I just started understanding processing a lil bit and im trying to write a minigame.

The minigame will be pretty simple. Its a character wich can be moved by keys. The player has to collect objects under timepressure.

Well my mainproblem is how to collect the objects and add the points at the counter. How can I define where the character is placed with keyPressed (is there a definition like mouseX, mouseY?!)

thats what i got at the moment.. Wink

float bg_ypos = -1800;
float characterx = 300;
float charactery = 450;
float character_geschwindigkeit=3;
float bg_geschwindigkeit=2;

float coiny001=-800;
float coiny002=-900;
float coiny003=-1000;

PImage bg_001_clouds;
PImage intro_lvl_001;
PImage plane001;
PImage coin002_bild;

PFont myriad;

void setup () {
frameRate (0.25);

size (800, 600);
bg_001_clouds= loadImage ("bg_001_clouds.png");
intro_lvl_001= loadImage ("intro_lvl_001.png");
plane001= loadImage ("plane001.png");
coin002_bild= loadImage ("coin002.png");

myriad=loadFont ("MyriadPro-BoldIt-48.vlw");
image(intro_lvl_001,0,0);
}

void draw () {

smooth();
frameRate (200);

bg_ypos = bg_ypos + bg_geschwindigkeit;
if (bg_ypos > 0) {
bg_ypos = -1800;
}

coiny001 = coiny001 + bg_geschwindigkeit;
coiny002 = coiny002 + bg_geschwindigkeit;
coiny003 = coiny003 + bg_geschwindigkeit;

image(bg_001_clouds,0,bg_ypos);
image(plane001,characterx, charactery);

image(coin002_bild,300,coiny001);
image(coin002_bild,350,coiny002);
image(coin002_bild,400,coiny003);

if(keyPressed){
if(key=='a'){
characterx=characterx-character_geschwindigkeit;
}
if (key=='d'){
characterx=characterx+character_geschwindigkeit;
}
if(key=='s'){
charactery=charactery+character_geschwindigkeit;
}
if (key=='w'){
charactery=charactery-character_geschwindigkeit;
}
}
}

thx a lot!
RaG

antiplastik

Re: How to collect objects in a minigame?
Reply #1 - Dec 5^th, 2009, 3:07am

Some tips :

you could use PVector to store 2D positions. That would be much easier than storing x and y in different variables and it's a first step to OOP. For example :
Code:
```
PVector character = new PVector(200, 300);
image(imgCharacter, character.x, character.y); 
```
to check if your character has reached an object, you could use collision detection. For example, using the dist() method, you can calculate the distance between your character and a coin.

to check if your character has hit an coin, you may need to store all your coins in a unique array, so you can later iterate through this array :
Code:

// declare the array
PVector[] coins = new PVector[3];

// fill the array
coins[0] = new PVector(100, 200);
coins[1] = new PVector(200, 200);
coins[2] = new PVector(300, 200);

// iterate through the array
for (int i = 0; i < coins.length; i++) {
  PVector coin = coins[i];
  if (dist(character.x, character.y, coin.x, coin.y) < 10) {
    // coin has been collected
  }
}

RaG YaBB Newbies Offline Posts: 4	Re: How to collect objects in a minigame? Reply #2 - Dec 5^th, 2009, 4:04am yeah...merci beaucoup.. gonna try it..

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