utils.c

#include "utils.h"
#include <stdio.h>
#include <stdlib.h>

SDL_Texture* loadTexture(SDL_Renderer* renderer, const char* filename){
    SDL_Texture* txt;
    SDL_Surface* tmp = IMG_Load(filename);
    Uint32 colorkey = SDL_MapRGB( tmp->format, 100, 100, 100 );
    SDL_SetColorKey(tmp,SDL_TRUE,colorkey);
    txt = SDL_CreateTextureFromSurface(renderer,tmp);
    SDL_FreeSurface(tmp);
    return txt;
}

int checkCollision(SDL_Rect rect1,SDL_Rect rect2){
    // Find edges of rect1
	int left1 = rect1.x;
	int right1 = rect1.x + rect1.w;
	int top1 = rect1.y;
	int bottom1 = rect1.y + rect1.h;

	// Find edges of rect2
	int left2 = rect2.x;
	int right2 = rect2.x + rect2.w;
	int top2 = rect2.y;
	int bottom2 = rect2.y + rect2.h;

	// Check edges
	if ( left1 > right2 )// Left 1 is right of right 2
		return 0; // No collision

	if ( right1 < left2 ) // Right 1 is left of left 2
		return 0; // No collision

	if ( top1 > bottom2 ) // Top 1 is below bottom 2
		return 0; // No collision

	if ( bottom1 < top2 ) // Bottom 1 is above top 2
		return 0; // No collision

    return 1;
}

void clearScreen(SDL_Renderer* renderer){
    SDL_SetRenderDrawColor(renderer,0,0,0,255);
    //Screen is black
    SDL_RenderClear(renderer);

}

Particles* genParticles(int x, int y,int numParticles, Direction d, int lifetime){
	SDL_Point *particles = (SDL_Point*) malloc(numParticles*sizeof(SDL_Point));
	for(int i=0;i<numParticles;i++){
		int signx = (d==RIGHT)?-1:1;
		int signy = (rand()%2)?-1:1;
		particles[i].x = x + signx*rand()%20;
		particles[i].y = y + signy*rand()%20;
	}
	Particles* p = (Particles*)malloc(sizeof(Particles));
	p->points = particles;
	p->d = d;
	p->numpoints = numParticles;
	p->lifetime = lifetime;
	return p;
}

void killParticles(Particles* p){
	free(p->points);
	free(p);
}

void drawParticles(SDL_Renderer* rnd, Particles* p){
	if(p->d == RIGHT){
		SDL_SetRenderDrawColor(rnd,64,255,64,255);
	}
	else{
		SDL_SetRenderDrawColor(rnd,255,64,64,255);
	}
	SDL_RenderDrawPoints(rnd,p->points,p->numpoints);
	for(int i=0;i<p->numpoints;i++){
		p->points[i].x += (p->d == LEFT)?rand()%8:-rand()%8;
		p->points[i].y += (rand()%2)?rand()%8:-rand()%8;
	}
}