VirusAttack/olcCodeJam2023Entry/VirusAttack.cpp

#define OLC_PGE_APPLICATION
#include "olcPixelGameEngine.h"
#define OLC_SOUNDWAVE
#include "olcSoundWaveEngine.h"
#include "VirusAttack.h"
#include "olcUTIL_Geometry2D.h"

VirusAttack::VirusAttack()
{
	// Name your application
	sAppName = "olcCodeJam 2023 Entry";
}

bool VirusAttack::OnUserCreate(){

	CONSTANT::VIRUS_IMG1.Load("assets/unit.png");
	CONSTANT::SELECTION_CIRCLE.Load("assets/selection_circle.png");

	units.push_back(std::make_unique<BasicUnit>(vf2d{32,32},CONSTANT::VIRUS_IMG1,true));
	for(int i=0;i<10;i++){
		if(rand()%2==0){
			units.push_back(std::make_unique<BasicUnit>(vf2d{float(rand()%ScreenWidth()),float(rand()%ScreenHeight())},CONSTANT::VIRUS_IMG1,true));
		} else {
			units.push_back(std::make_unique<BasicUnit2>(vf2d{float(rand()%ScreenWidth()),float(rand()%ScreenHeight())},CONSTANT::VIRUS_IMG1,false));
		}
	}
	return true;
}

void VirusAttack::HandleDraggingSelection(){
	if(GetMouse(0).bPressed){
		for(auto&u:units){
			u->Deselect();
		}
		if(startingDragPos==CONSTANT::UNSELECTED){
			startingDragPos=GetMousePos();
		}
	}
	if(GetMouse(0).bReleased){
		vf2d endDragPos=GetMousePos();
		if(endDragPos.x<startingDragPos.x){std::swap(startingDragPos.x,endDragPos.x);}
		if(endDragPos.y<startingDragPos.y){std::swap(startingDragPos.y,endDragPos.y);}
		geom2d::rect<float> selectionRegion(startingDragPos,endDragPos-startingDragPos);
		for(auto&u:units){
			if(u->IsFriendly()){
				if(geom2d::overlaps(selectionRegion,u->GetPos())){
					u->Select();
				}
			}
		}
		startingDragPos=CONSTANT::UNSELECTED;
	}
}

void VirusAttack::DrawSelectionRectangle(){
	if(startingDragPos!=CONSTANT::UNSELECTED){
		FillRectDecal(startingDragPos,GetMousePos()-startingDragPos,{255,255,0,128});
	}
}

void VirusAttack::HandleRightClickMove(){
	if (GetMouse(1).bPressed){
		bool selectedTarget=false;
		for(auto&u:units){
			if(!u->IsFriendly()){
				geom2d::rect<float> unitRegion(u->GetPos()-u->GetUnitSize()/2,u->GetUnitSize());
				if(geom2d::overlaps(unitRegion,GetMousePos())){
					for(auto&u2:units){
						if(u2->IsFriendly()&&u2->IsSelected()){
							u2->SetTargetUnit(u);
						}
					}
					selectedTarget=true;
					break;
				}
			}
		}
		if(!selectedTarget){
			for(auto&u:units){
				if(u->IsFriendly()&&u->IsSelected()){
					u->SetTargetLocation(GetMousePos());
				}
			}
		}
	}
}

void VirusAttack::CollisionChecking(std::shared_ptr<Unit>u,std::shared_ptr<Unit>u2){
	if(u!=u2&&geom2d::overlaps(geom2d::circle<float>(u->GetPos(),u->GetUnitSize().x/2),geom2d::circle<float>(u2->GetPos(),u2->GetUnitSize().x/2))){
		geom2d::line<float>collisionLine(u->GetPos(),u2->GetPos());
		float maxDist=u->GetUnitSize().x/2+u2->GetUnitSize().x/2;
		float dist=maxDist-collisionLine.length();
		vf2d dir=collisionLine.vector().norm();
		u->SetPos(u->GetPos()-dir*dist/2);
		u2->SetPos(u2->GetPos()+dir*dist/2);
	}
}

void VirusAttack::IdentifyClosestTarget(Unit*&closestUnit,float&closestDist,std::shared_ptr<Unit>u,std::shared_ptr<Unit>u2){
	if(u->IsFriendly()!=u2->IsFriendly()){
		geom2d::line<float>unitLine(u->GetPos(),u2->GetPos());
		if(unitLine.length()<closestDist){
			closestUnit=u2.get();
			closestDist=unitLine.length();
		}
	}
}

bool VirusAttack::OnUserUpdate(float fElapsedTime){
	HandleDraggingSelection();
	HandleRightClickMove();

	for(auto&u:units){
		Unit*closestUnit=nullptr;
		float closestDist=999999;
		for(auto&u2:units){
			IdentifyClosestTarget(closestUnit,closestDist,u,u2);
			CollisionChecking(u,u2);
		}
		u->AttemptAttack(closestUnit);
		u->Update(fElapsedTime);
	}

	for(auto&u:units){
		u->Draw(this);
	}

	DrawSelectionRectangle();

	return true;
}

int main()
{
	VirusAttack app;
	if (app.Construct(426, 320, 4, 4))
		app.Start();
	return 0;
}