src/Pixel.cpp

   1 #include "Pixel.h"
   2 //#include <stdlib.h>
   3 #include <GLES/gl.h>
   4 #include "SDL.h"
   5
   6 Pixel::Pixel(SDL_Surface* screen) {
   7         this->x = (rand() / (float)RAND_MAX) * screen->w;
   8         this->y = (rand() / (float)RAND_MAX) * screen->h;
   9         this->vx = (rand() / (float)RAND_MAX) * 10.0 - 5.0;
  10         this->vy = (rand() / (float)RAND_MAX) * 10.0 - 5.0;
  11         this->lastupdate = SDL_GetTicks();
  12 }
  13
  14 Pixel::~Pixel(void) {
  15 }
  16
  17 void Pixel::accel(float x, float y) {
  18         this->vx += x;
  19         if (this->vx > 100.0)
  20                 this->vx = 100.0;
  21         else if (this->vx < -100.0)
  22                 this->vx = -100.0;
  23         this->vy += y;
  24         if (this->vy > 100.0)
  25                 this->vy = 100.0;
  26         else if (this->vy < -100.0)
  27                 this->vy = -100.0;
  28 }
  29
  30 void Pixel::update() {
  31         Uint32 now = SDL_GetTicks();
  32         float dt = (now - this->lastupdate) / 75.0;
  33         if (dt < 1000) {   // If we're running less than 1FPS, don't bother updating.
  34                 this->x += this->vx * dt;
  35                 this->y += this->vy * dt;
  36         }
  37         this->lastupdate = now;
  38 }
  39
  40 void Pixel::draw(GLfloat *vertices) {
  41         vertices[0] = this->x;
  42         vertices[1] = this->y;
  43         vertices[3] = this->x - this->vx / 4.0f;
  44         vertices[4] = this->y - this->vy / 4.0f;
  45 }