#include "Pixel.h"
//#include <stdlib.h>
#include <GLES/gl.h>
#include "SDL.h"

Pixel::Pixel(SDL_Surface* screen) {
	this->x = (rand() / (float)RAND_MAX) * screen->w;
	this->y = (rand() / (float)RAND_MAX) * screen->h;
	this->vx = (rand() / (float)RAND_MAX) * 10.0 - 5.0;
	this->vy = (rand() / (float)RAND_MAX) * 10.0 - 5.0;
	this->lastupdate = SDL_GetTicks();
}

Pixel::~Pixel(void) {
}

void Pixel::accel(float x, float y) {
	this->vx += x;
	if (this->vx > 100.0)
		this->vx = 100.0;
	else if (this->vx < -100.0)
		this->vx = -100.0;
	this->vy += y;
	if (this->vy > 100.0)
		this->vy = 100.0;
	else if (this->vy < -100.0)
		this->vy = -100.0;
}

void Pixel::update() {
	Uint32 now = SDL_GetTicks();
	float dt = (now - this->lastupdate) / 75.0;
	if (dt < 1000) {   // If we're running less than 1FPS, don't bother updating.
		this->x += this->vx * dt;
		this->y += this->vy * dt;
	}
	this->lastupdate = now;
}

void Pixel::draw(GLfloat *vertices) {
	vertices[0] = this->x;
	vertices[1] = this->y;
	vertices[3] = this->x - this->vx / 4.0f;
	vertices[4] = this->y - this->vy / 4.0f;
}