Add project files.

ShooterExample.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33516.290
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ShooterExample", "ShooterExample\ShooterExample.vcxproj", "{BFEFE123-590A-4768-8E34-8FAD8DFFE223}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Debug|x64.ActiveCfg = Debug|x64
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Debug|x64.Build.0 = Debug|x64
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Debug|x86.ActiveCfg = Debug|Win32
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Debug|x86.Build.0 = Debug|Win32
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Release|x64.ActiveCfg = Release|x64
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Release|x64.Build.0 = Release|x64
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Release|x86.ActiveCfg = Release|Win32
+		{BFEFE123-590A-4768-8E34-8FAD8DFFE223}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {ABF6C5B6-2E14-4C67-B825-539C3E2B130A}
+	EndGlobalSection
+EndGlobal

ShooterExample/ShooterExample.cpp

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+#define OLC_PGE_APPLICATION
+#include "olcPixelGameEngine.h"
+
+struct Rect{
+	int x,y,w,h;
+};
+
+class Enemy{
+	olc::vf2d pos;
+	Rect*sprite;
+	int health;
+public:
+	Enemy(olc::vi2d pos,Rect*sprite,int health=1)
+		:pos(pos),sprite(sprite),health(health){};
+	olc::vf2d GetPos(){
+		return pos;	
+	}
+	olc::vi2d GetSprPos(){
+		return {sprite->x,sprite->y};	
+	}
+	olc::vi2d GetSprSize(){
+		return {sprite->w,sprite->h};	
+	}
+	void Hurt(int damage=1){
+		health-=damage;
+	}
+	bool IsAlive(){
+		return health>0;
+	}
+	void Move(olc::vi2d moveAmt){
+		pos+=moveAmt;
+	}
+	olc::Pixel GetColor(){
+		if(health>1){
+			return {255,96,96};
+		} else {
+			return olc::GREEN;
+		}
+	}
+};
+
+class Player{
+	olc::vf2d pos;
+	Rect*sprite;
+	float lastShootTime=0;
+public:
+	Player(olc::vi2d pos,Rect*sprite)
+		:pos(pos),sprite(sprite){}
+	olc::vf2d GetPos(){
+		return pos;
+	}
+	olc::vi2d GetSprPos(){
+		return {sprite->x,sprite->y};	
+	}
+	olc::vi2d GetSprSize(){
+		return {sprite->w,sprite->h};	
+	}
+	void Update(float fElapsedTime){
+		lastShootTime=std::max(lastShootTime-fElapsedTime,0.f);
+	}
+	bool CanShoot(){
+		return lastShootTime==0;
+	}
+	void OnShoot(){
+		lastShootTime=0.5;
+	}
+	void Move(olc::vf2d moveAmt){
+		pos+=moveAmt;
+	}
+};
+
+class Bullet{
+	olc::vf2d pos;
+	bool alive=true;
+public:
+	Bullet(olc::vi2d pos)
+		:pos(pos){}
+	olc::vf2d GetPos(){
+		return pos;
+	}
+	void Update(float fElapsedTime){
+		pos+={0,-72*fElapsedTime};
+	}
+	bool CollidesWith(Enemy&enemy){
+		float dist2=pow(enemy.GetPos().x+enemy.GetSprSize().x-pos.x,2)+pow(enemy.GetPos().y+enemy.GetSprSize().y-pos.y,2);
+		return dist2<64;
+	}
+	void KillBullet(){
+		alive=false;
+	}
+	bool IsAlive(){
+		return alive||pos.y<0;
+	}
+};
+
+// Override base class with your custom functionality
+class ShooterExample : public olc::PixelGameEngine
+{
+public:
+	ShooterExample()
+	{
+		// Name your application
+		sAppName = "Shooter Example";
+	}
+
+public:
+	olc::Renderable spriteSheet;
+	Rect enemyA={5,21,	11,9};
+	Rect enemyB={19,22,	12,6};
+	Rect enemyC={34,20,	11,8};
+	Rect ship={35,6,	11,7};
+
+	std::vector<Enemy>enemies;
+	std::vector<Bullet>bullets;
+
+	Player player{{ScreenWidth()/2,ScreenHeight()-36},&ship};
+	int alienShift=0;
+	bool movingRight=true;
+	float lastShiftTime=0;
+	
+	bool OnUserCreate() override
+	{
+		spriteSheet.Load("8-bit Aliens.png");
+
+		olc::vf2d alienOffset={24,38};
+		for (int y=0;y<4;y++){
+			for (int x=0;x<12;x++){
+				switch(rand()%3){
+					case 0:{
+						Enemy enemy{alienOffset+olc::vi2d{x*16,y*12},&enemyA};
+						enemies.push_back(enemy);
+					}break;
+					case 1:{
+						Enemy enemy{alienOffset+olc::vi2d{x*16,y*12},&enemyB};
+						enemies.push_back(enemy);
+					}break;
+					case 2:{
+						Enemy enemy{alienOffset+olc::vi2d{x*16,y*12},&enemyC,2};
+						enemies.push_back(enemy);
+					}break;
+				}
+			}
+		}
+		return true;
+	}
+
+	bool OnUserUpdate(float fElapsedTime) override
+	{
+		//Update Game Objects
+		player.Update(fElapsedTime);
+
+		for(Bullet&b:bullets){
+			b.Update(fElapsedTime);
+		}
+
+		lastShiftTime+=fElapsedTime;
+		if(lastShiftTime>0.8){
+			lastShiftTime-=0.8;
+			if(abs(alienShift)>=3){
+				alienShift+=movingRight?-1:1;
+				movingRight=!movingRight;
+				for(Enemy&e:enemies){
+					e.Move({0,12});
+				}
+			} else
+			if(movingRight){
+				alienShift++;
+				for(Enemy&e:enemies){
+					e.Move({12,0});
+				}
+			} else {
+				alienShift--;
+				for(Enemy&e:enemies){
+					e.Move({-12,0});
+				}
+			}
+		}
+
+		if(GetKey(olc::SPACE).bHeld){
+			if(player.CanShoot()){
+				player.OnShoot();
+				bullets.push_back({player.GetPos()+player.GetSprSize()});
+			}
+		}
+		if(GetKey(olc::LEFT).bHeld){
+			player.Move({-48*fElapsedTime,0});
+		}
+		if(GetKey(olc::RIGHT).bHeld){
+			player.Move({48*fElapsedTime,0});
+		}
+
+		// Called once per frame, draws random coloured pixels
+		Clear(olc::BLACK);
+		for(Enemy&e:enemies){
+			for(Bullet&b:bullets){
+				if(!b.IsAlive())continue;
+				if(b.CollidesWith(e)){
+					e.Hurt();
+					b.KillBullet();
+				}
+				DrawLineDecal(b.GetPos(),b.GetPos()+olc::vi2d{0,-4},olc::WHITE);
+			}
+			DrawPartialDecal(e.GetPos()+e.GetSprSize()/2,e.GetSprSize(),spriteSheet.Decal(),e.GetSprPos(),e.GetSprSize(),e.GetColor());
+		}
+
+		DrawPartialDecal(player.GetPos()+player.GetSprSize()/2,player.GetSprSize(),spriteSheet.Decal(),player.GetSprPos(),player.GetSprSize());
+
+		enemies.erase(std::remove_if(enemies.begin(),enemies.end(),[](Enemy&e){return !e.IsAlive();}),enemies.end());
+		bullets.erase(std::remove_if(bullets.begin(),bullets.end(),[](Bullet&b){return !b.IsAlive();}),bullets.end());
+		return true;
+	}
+};
+
+int main()
+{
+	ShooterExample demo;
+	if (demo.Construct(256, 240, 4, 4))
+		demo.Start();
+	return 0;
+}

ShooterExample/ShooterExample.vcxproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <VCProjectVersion>16.0</VCProjectVersion>
+    <Keyword>Win32Proj</Keyword>
+    <ProjectGuid>{bfefe123-590a-4768-8e34-8fad8dffe223}</ProjectGuid>
+    <RootNamespace>ShooterExample</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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+  <PropertyGroup Label="UserMacros" />
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+    <ClCompile>
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+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
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+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
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+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
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+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <ConformanceMode>true</ConformanceMode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClInclude Include="olcPixelGameEngine.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="ShooterExample.cpp" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

ShooterExample/ShooterExample.vcxproj.filters

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
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+    <Filter Include="Header Files">
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+      <Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
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+    <Filter Include="Resource Files">
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+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
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+  <ItemGroup>
+    <ClInclude Include="olcPixelGameEngine.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="ShooterExample.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>