Smoke/main.cpp

#define OLC_PGE_APPLICATION
#include "pixelGameEngine.h"
#include "Smoke.h"

using namespace olc;

class Example : public PixelGameEngine
{
public:
	std::vector<Smoke> smokeParticles;
	float lastCreationTime=0;
	Example()
	{
		sAppName = "Example";
	}

public:

	float range(float low, float high) {
		return rand()%10000/10000.f*(high-low)+(low);
	}

	bool OnUserCreate() override
	{
		// Called once at the start, so create things here
		int smokeCount=200;
		int RANDOM_SPREAD_VAL=10; //Spread out between this amount;
		for (int i=0;i<smokeCount;i++) {
			smokeParticles.push_back(
			/*Size*/{{2,range(0.5,1)},
			/*Position*/{range(100,100+RANDOM_SPREAD_VAL)-RANDOM_SPREAD_VAL/2,range(100,102)}
			,/*Rise Speed*/range(1,3),/*Fade Speed*/range(60,100)});
		}
		
		for (int i=0;i<smokeCount;i++) {
			smokeParticles.push_back(
			/*Size*/{{2,range(0.5,1)},
			/*Position*/{range(200,202) , range(100,102)}
			,/*Rise Speed*/range(0.5,1.5),/*Fade Speed*/range(100,200)});
		}
		return true;
	}

	bool OnUserUpdate(float fElapsedTime) override
	{
		for (int i=0;i<smokeParticles.size();i++) {
			smokeParticles[i].update(fElapsedTime);
			smokeParticles[i].render(this);
			
			if (smokeParticles[i].expired()) {
				smokeParticles.erase(smokeParticles.begin()+i--);
			}
		}

		lastCreationTime+=fElapsedTime;
		if (lastCreationTime>0.2) {
		
			for (int i=0;i<10;i++) {
				smokeParticles.push_back(
				/*Size*/{{5,range(2,5)},
				/*Position*/{range(175,225) , range(100,102)}
				,/*Rise Speed*/range(1,2.5),/*Fade Speed*/range(30,50)});
			}
			lastCreationTime-=0.2;
		}
		return true;
	}
};


int main()
{
	Example demo;
	if (demo.Construct(256, 240, 4, 4))
		demo.Start();

	return 0;
}