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snow (Read 565 times)
wutti
snow
Dec 23rd, 2007, 5:33pm  
hello!
i´m a complete beginner, tried to make falling snow, now there´s 2 things missing:
1. don´t know how to put a limit, if(x>600) ... which statement i need to put, that the sequence starts from the beginning?
and 2. how i do it without having to draw all the snowflakes? i think with an array (which i don´t understand in the manual)....
somebody can please, please, help me with the code?
Smiley please ?
carmen


float x, y;

void setup()
{
 size(800,600);
 smooth();
 noStroke();
 frameRate(60);
}

void draw()
{
 background(102);
 
 x = x + 0.06;
 y = y + 0.2;
 

 
 translate(x, y);
 fill(255);



ellipse(x+50, y+10, 5, 5);
 ellipse(x, y, 4, 4);
  ellipse(x+110, y+40, 5, 5);
 ellipse(x+200, y+150, 4, 4);
 
  ellipse(x+550, y+210, 5, 5);
 ellipse(x+500, y, 4, 4);
  ellipse(x+510, y+40, 5, 5);
 ellipse(x+500, y+150, 4, 4);
 
  ellipse(x+250, y+30, 5, 5);
 ellipse(x, y, 4, 4);
  ellipse(x+210, y+20, 5, 5);
 ellipse(x+240, y+50, 4, 4);
 
  ellipse(x+550, y+210, 5, 5);
 ellipse(x+500, y+20, 4, 4);
  ellipse(x+510, y+140, 5, 5);
 ellipse(x+500, y+150, 4, 4);
 
  ellipse(x+750, y+110, 5, 5);
 ellipse(x+700, y+59, 4, 4);
  ellipse(x+580, y+60, 5, 5);
 ellipse(x+650, y+150, 4, 4);
 
  ellipse(x+670, y+210, 5, 5);
 ellipse(x+600, y, 4, 4);
  ellipse(x+610, y+40, 5, 5);
 ellipse(x+580, y+150, 4, 4);
}
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antiplastik
Re: snow
Reply #1 - Dec 23rd, 2007, 9:57pm  
hi carmen,

1. use the constrain method to limit x :
http://processing.org/reference/constrain_.html

Code:
ellipse(constrain(x+50, 0, 600), y+10, 5, 5);
// instead of :
ellipse(x+50, y+10, 5, 5);


2. since your snowflakes have different position and size, you should create a custom class with these parameters :

Code:
class Snowflake {
  
  float x, y; // each snowflake has its own position
  int size;   // and size
  
  // this is a simple constructor
  public class Snowflake(float x, float y, int size) {
    this.x = x; this.y = y; this.size = size;
  }
  
}


then, create new snowflakes in the setup() method and store them in a array :

Code:
// declare an array of 24 Snowflake objects
Snowflake[] snowflakes = new Snowflake[24];

// fill the array with new snowflakes :
snowflakes[0] = new Snowflake(50, 10, 5);
// ...
snowflakes[23] = new Snowflake(580, 150, 4);


int the draw() method, move and display the snowflakes using a for-loop :

Code:
for (int i = 0; i < snowflakes.length; i++) {
  snowflakes[i].x += x;
  snowflakes[i].y += y;
  ellipse(constrain(snowflakes[i].x, 0, 600), snowflakes[i].y, snowflakes[i].size, snowflakes[i].size);
}
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