olcPixelGameEngine/examples/TEST_Animate2D.cpp

/*
	Example file for olcUTIL_Animate2D.h

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	~~~~~~~~~~~~~~~

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*/


#define OLC_PGE_APPLICATION
#include "olcPixelGameEngine.h"

#include "utilities/olcUTIL_Animate2D.h"

class TEST_Animate2D : public olc::PixelGameEngine
{
public:
	TEST_Animate2D()
	{		
		sAppName = "Animate2D Utility Test";
	}

	// These are the states the dude can exist in, we'll need these for physics
	// and animation. The physics side of things moves the dude around according to state,
	// while the animator chooses the frames based upon state and time
	enum class DudeState: uint8_t
	{
		WALK_N, WALK_S, WALK_E, WALK_W, IDLE_STAND,	LAUGH, CHEER, YES, NO
	};

	// !! - IMPORTANT - !!
	// The animation set
	olc::utils::Animate2D::Animation<DudeState> animDude;

	// One big sprite containing all the graphics
	olc::Renderable gfxAll;

	// Small object to reprsent a dude walking around doing things
	struct sWalkingDude
	{
		// Which dude overall out of graophic?
		int32_t id = 0;
		// Where are they?
		olc::vf2d pos;
		// What are they doing?
		DudeState UserState = DudeState::IDLE_STAND;
		// For how long should they do it?
		float fTick = 0.0f;

		// !! - IMPORTANT - !!
		// Animation Token - links this object's state to animator. Note
		// there is no 'ownership' or memory issues here, this is a token
		// that the animator can use to quickly get to where it needs
		// in order to return frames upon request for this object.
		olc::utils::Animate2D::AnimationState animstate;
	};

	// Introducing.... The dudes!
	size_t nDudes = 500;
	std::vector<sWalkingDude> vDudes;

public:
	bool OnUserCreate() override
	{	
		// For this appliaction I have a single image that contains
		// 28x2 unique characters, each character contains 8 animations of 3
		// frames each. Each frame is 26x36 pixels
		gfxAll.Load("./assets/MegaSprite1.png");

		// Thats A LOT of individual graphics, but they all follow a similar pattern
		// because the asset was created usefully (take note certain popular asset creators)
		// which means we can reuse the animation without needing to define it
		// individually for all the "dudes" - the "cookie cutter" approach

		// Manually construct sequences - gfxAll could in fact be nullptr for this
		// application, but ive kept it here for convenience
		olc::utils::Animate2D::FrameSequence anim_fs_walk_s;
		anim_fs_walk_s.AddFrame({ &gfxAll, {{0,0}, {26,36}} });
		anim_fs_walk_s.AddFrame({ &gfxAll, {{26,0}, {26,36}} });
		anim_fs_walk_s.AddFrame({ &gfxAll, {{52,0}, {26,36}} });

		olc::utils::Animate2D::FrameSequence anim_fs_walk_w;
		anim_fs_walk_w.AddFrame({ &gfxAll, {{ 0,36}, {26,36}} });
		anim_fs_walk_w.AddFrame({ &gfxAll, {{26,36}, {26,36}} });
		anim_fs_walk_w.AddFrame({ &gfxAll, {{52,36}, {26,36}} });

		olc::utils::Animate2D::FrameSequence anim_fs_walk_e;
		anim_fs_walk_e.AddFrame({ &gfxAll, {{ 0,72}, {26,36}} });
		anim_fs_walk_e.AddFrame({ &gfxAll, {{26,72}, {26,36}} });
		anim_fs_walk_e.AddFrame({ &gfxAll, {{52,72}, {26,36}} });

		olc::utils::Animate2D::FrameSequence anim_fs_walk_n;
		anim_fs_walk_n.AddFrame({ &gfxAll, {{ 0,108}, {26,36}} });
		anim_fs_walk_n.AddFrame({ &gfxAll, {{26,108}, {26,36}} });
		anim_fs_walk_n.AddFrame({ &gfxAll, {{52,108}, {26,36}} });

		olc::utils::Animate2D::FrameSequence anim_fs_yes;
		anim_fs_yes.AddFrame({ &gfxAll, {{ 0,144}, {26,36}} });
		anim_fs_yes.AddFrame({ &gfxAll, {{26,144}, {26,36}} });
		anim_fs_yes.AddFrame({ &gfxAll, {{52,144}, {26,36}} });

		olc::utils::Animate2D::FrameSequence anim_fs_no;
		anim_fs_no.AddFrame({ &gfxAll, {{ 0,180}, {26,36}} });
		anim_fs_no.AddFrame({ &gfxAll, {{26,180}, {26,36}} });
		anim_fs_no.AddFrame({ &gfxAll, {{52,180}, {26,36}} });

		olc::utils::Animate2D::FrameSequence anim_fs_laugh;
		anim_fs_laugh.AddFrame({ &gfxAll, {{ 0,216}, {26,36}} });
		anim_fs_laugh.AddFrame({ &gfxAll, {{26,216}, {26,36}} });
		anim_fs_laugh.AddFrame({ &gfxAll, {{52,216}, {26,36}} });

		olc::utils::Animate2D::FrameSequence anim_fs_cheer;
		anim_fs_cheer.AddFrame({ &gfxAll, {{ 0,252}, {26,36}} });
		anim_fs_cheer.AddFrame({ &gfxAll, {{26,252}, {26,36}} });
		anim_fs_cheer.AddFrame({ &gfxAll, {{52,252}, {26,36}} });

		// A special "idle" animation just consists of a single frame
		olc::utils::Animate2D::FrameSequence anim_fs_idle;
		anim_fs_idle.AddFrame({ &gfxAll, {{26,0}, {26,36}} });

		// We have constructed teh individual sequences, now its time
		// to add them to an animation, along with a state name/enum.
		//
		// I have chosen to use the enum shown earlier. You could use
		// std::string too, which is conveninent if you need to display
		// the states, though potentially far less performant

		animDude.AddState(DudeState::WALK_S, anim_fs_walk_s);
		animDude.AddState(DudeState::WALK_W, anim_fs_walk_w);
		animDude.AddState(DudeState::WALK_E, anim_fs_walk_e);
		animDude.AddState(DudeState::WALK_N, anim_fs_walk_n);
		animDude.AddState(DudeState::IDLE_STAND, anim_fs_idle);
		animDude.AddState(DudeState::YES, anim_fs_yes);
		animDude.AddState(DudeState::NO, anim_fs_no);
		animDude.AddState(DudeState::LAUGH, anim_fs_laugh);
		animDude.AddState(DudeState::CHEER, anim_fs_cheer);
		
		// Initialise the dudes
		for (size_t n = 0; n < nDudes; n++)
		{
			sWalkingDude dude;

			// Random dude
			dude.id = rand() % (28 * 2);

			// Begin in idle state, at random location
			dude.UserState = DudeState::IDLE_STAND;
			dude.pos = { float(rand() % ScreenWidth()), float(rand() % ScreenHeight()) };

			// The animation token needs to be updated too
			animDude.ChangeState(dude.animstate, dude.UserState);

			vDudes.push_back(dude);
		}
		return true;
	}

	bool OnUserUpdate(float fElapsedTime) override
	{	
		// Update Dudes		
		float fSpeed = 32.0f;
		
		for (auto& dude : vDudes)
		{
			// If a dude's tick reaches 0, it will select a new state
			dude.fTick -= fElapsedTime;
			if (dude.fTick < 0.0f)
			{
				// Choose one out of the 9 randomly
				int nAction = rand() % 9;

				// Choose for how long it should do it in seconds
				dude.fTick = (float(rand()) / float(RAND_MAX)) * 5.0f;

				// Assign the state depending on the dice roll - (since enum
				// we could cast here too, but, well, meh...)
				if (nAction == 0) dude.UserState = DudeState::IDLE_STAND;
				if (nAction == 1) dude.UserState = DudeState::WALK_S;
				if (nAction == 2) dude.UserState = DudeState::WALK_N;
				if (nAction == 3) dude.UserState = DudeState::WALK_E;
				if (nAction == 4) dude.UserState = DudeState::WALK_W;
				if (nAction == 5) dude.UserState = DudeState::YES;
				if (nAction == 6) dude.UserState = DudeState::NO;
				if (nAction == 7) dude.UserState = DudeState::LAUGH;
				if (nAction == 8) dude.UserState = DudeState::CHEER;

				// State has changed, so update animation token
				// !! - IMPORTANT - !!
				animDude.ChangeState(dude.animstate, dude.UserState);
			}

			// Update "physics", if walking move in that direction at speed
			if (dude.UserState == DudeState::WALK_S) dude.pos += olc::vf2d(0, +1) * fSpeed * fElapsedTime;
			if (dude.UserState == DudeState::WALK_N) dude.pos += olc::vf2d(0, -1) * fSpeed * fElapsedTime;
			if (dude.UserState == DudeState::WALK_E) dude.pos += olc::vf2d(+1, 0) * fSpeed * fElapsedTime;
			if (dude.UserState == DudeState::WALK_W) dude.pos += olc::vf2d(-1, 0) * fSpeed * fElapsedTime;

			// If walk off screen, wrap around to other side
			if (dude.pos.x > ScreenWidth()) dude.pos.x -= ScreenWidth();
			if (dude.pos.y > ScreenHeight()) dude.pos.x -= ScreenHeight();
			if (dude.pos.x < 0) dude.pos.x += ScreenWidth();
			if (dude.pos.y < 0) dude.pos.y += ScreenHeight();

			// Update animation token every frame
			// !! - IMPORTANT - !!
			animDude.UpdateState(dude.animstate, fElapsedTime);
		}
		
		// Render Dudes
		for (const auto& dude : vDudes)
		{
			// Get the frame, this contains both source image and source location rectangle
			// !! - IMPORTANT - !!
			const auto& frame = animDude.GetFrame(dude.animstate);

			// Thats cool, but there are 28x2 dudes on the sprite sheet, so using the ID, construct
			// an offset to the correct dude
			olc::vi2d vOffset = { (dude.id % 28) * 78, (dude.id / 28) * 288 };

			// Use DrawPartialDecal to chop out the correct dude frm the image source
			DrawPartialDecal(dude.pos, frame.GetSourceImage()->Decal(), frame.GetSourceRect().pos + vOffset, frame.GetSourceRect().size);
		}

		// That's it
		return true;
	}
};

int main()
{
	TEST_Animate2D demo;
	if (demo.Construct(640, 480, 2, 2))
		demo.Start();
	return 0;
}