Added Isometric Demo

Videos/OneLoneCoder_PGE_IsometricTiles.cpp

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+/*
+	Coding Quickie: Isometric Tiles
+	"Owww... My insides hurt :(" - javidx9
+
+	License (OLC-3)
+	~~~~~~~~~~~~~~~
+
+	Copyright 2018-2019 OneLoneCoder.com
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions
+	are met:
+
+	1. Redistributions or derivations of source code must retain the above
+	copyright notice, this list of conditions and the following disclaimer.
+
+	2. Redistributions or derivative works in binary form must reproduce
+	the above copyright notice. This list of conditions and the following
+	disclaimer must be reproduced in the documentation and/or other
+	materials provided with the distribution.
+
+	3. Neither the name of the copyright holder nor the names of its
+	contributors may be used to endorse or promote products derived
+	from this software without specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+	HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	
+
+	Relevant Video: https://youtu.be/ukkbNKTgf5U
+
+	Links
+	~~~~~
+	YouTube:	https://www.youtube.com/javidx9
+				https://www.youtube.com/javidx9extra
+	Discord:	https://discord.gg/WhwHUMV
+	Twitter:	https://www.twitter.com/javidx9
+	Twitch:		https://www.twitch.tv/javidx9
+	GitHub:		https://www.github.com/onelonecoder
+	Patreon:	https://www.patreon.com/javidx9
+	Homepage:	https://www.onelonecoder.com
+
+	Author
+	~~~~~~
+	David Barr, aka javidx9, ©OneLoneCoder 2019
+*/
+
+#define OLC_PGE_APPLICATION
+#include "olcPixelGameEngine.h"
+
+// Override base class with your custom functionality
+class IsometricDemo : public olc::PixelGameEngine
+{
+public:
+	IsometricDemo()
+	{
+		sAppName = "Coding Quickie: Isometric Tiles";
+	}
+
+private:
+	// Number of tiles in world
+	olc::vi2d vWorldSize = { 14, 10 };
+
+	// Size of single tile graphic
+	olc::vi2d vTileSize = { 40, 20 };
+
+	// Where to place tile (0,0) on screen (in tile size steps)
+	olc::vi2d vOrigin = { 5, 1 };
+
+	// Sprite that holds all imagery
+	olc::Sprite *sprIsom = nullptr;
+
+	// Pointer to create 2D world array
+	int *pWorld = nullptr;
+
+public:
+	bool OnUserCreate() override
+	{
+		// Load sprites used in demonstration
+		sprIsom = new olc::Sprite("isometric_demo.png");
+
+		// Create empty world
+		pWorld = new int[vWorldSize.x * vWorldSize.y]{ 0 };
+		return true;
+	}
+
+	bool OnUserUpdate(float fElapsedTime) override
+	{
+		Clear(olc::WHITE);
+
+		// Get Mouse in world
+		olc::vi2d vMouse = { GetMouseX(), GetMouseY() };
+		
+		// Work out active cell
+		olc::vi2d vCell = { vMouse.x / vTileSize.x, vMouse.y / vTileSize.y };
+
+		// Work out mouse offset into cell
+		olc::vi2d vOffset = { vMouse.x % vTileSize.x, vMouse.y % vTileSize.y };
+
+		// Sample into cell offset colour
+		olc::Pixel col = sprIsom->GetPixel(3 * vTileSize.x + vOffset.x, vOffset.y);
+
+		// Work out selected cell by transforming screen cell
+		olc::vi2d vSelected = 
+		{
+			(vCell.y - vOrigin.y) + (vCell.x - vOrigin.x),
+			(vCell.y - vOrigin.y) - (vCell.x - vOrigin.x) 
+		};
+
+		// "Bodge" selected cell by sampling corners
+		if (col == olc::RED) vSelected += {-1, +0};
+		if (col == olc::BLUE) vSelected += {+0, -1};
+		if (col == olc::GREEN) vSelected += {+0, +1};
+		if (col == olc::YELLOW) vSelected += {+1, +0};
+
+		// Handle mouse click to toggle if a tile is visible or not
+		if (GetMouse(0).bPressed)
+		{
+			// Guard array boundary
+			if (vSelected.x >= 0 && vSelected.x < vWorldSize.x && vSelected.y >= 0 && vSelected.y < vWorldSize.y)
+				++pWorld[vSelected.y * vWorldSize.x + vSelected.x] %= 6;
+		}
+						
+		// Labmda function to convert "world" coordinate into screen space
+		auto ToScreen = [&](int x, int y)
+		{			
+			return olc::vi2d
+			{
+				(vOrigin.x * vTileSize.x) + (x - y) * (vTileSize.x / 2),
+				(vOrigin.y * vTileSize.y) + (x + y) * (vTileSize.y / 2)
+			};
+		};
+		
+		// Draw World - has binary transparancy so enable masking
+		SetPixelMode(olc::Pixel::MASK);
+
+		// (0,0) is at top, defined by vOrigin, so draw from top to bottom
+		// to ensure tiles closest to camera are drawn last
+		for (int y = 0; y < vWorldSize.y; y++)
+		{
+			for (int x = 0; x < vWorldSize.x; x++)
+			{
+				// Convert cell coordinate to world space
+				olc::vi2d vWorld = ToScreen(x, y);
+				
+				switch(pWorld[y*vWorldSize.x + x])
+				{
+				case 0:
+					// Invisble Tile
+					DrawPartialSprite(vWorld.x, vWorld.y, sprIsom, 1 * vTileSize.x, 0, vTileSize.x, vTileSize.y);
+					break;
+				case 1:
+					// Visible Tile
+					DrawPartialSprite(vWorld.x, vWorld.y, sprIsom, 2 * vTileSize.x, 0, vTileSize.x, vTileSize.y);
+					break;
+				case 2:
+					// Tree
+					DrawPartialSprite(vWorld.x, vWorld.y - vTileSize.y, sprIsom, 0 * vTileSize.x, 1 * vTileSize.y, vTileSize.x, vTileSize.y * 2);
+					break;
+				case 3:
+					// Spooky Tree
+					DrawPartialSprite(vWorld.x, vWorld.y - vTileSize.y, sprIsom, 1 * vTileSize.x, 1 * vTileSize.y, vTileSize.x, vTileSize.y * 2);
+					break;
+				case 4:
+					// Beach
+					DrawPartialSprite(vWorld.x, vWorld.y - vTileSize.y, sprIsom, 2 * vTileSize.x, 1 * vTileSize.y, vTileSize.x, vTileSize.y * 2);
+					break;
+				case 5:
+					// Water
+					DrawPartialSprite(vWorld.x, vWorld.y - vTileSize.y, sprIsom, 3 * vTileSize.x, 1 * vTileSize.y, vTileSize.x, vTileSize.y * 2);
+					break;
+				}			
+			}
+		}
+
+		// Draw Selected Cell - Has varying alpha components
+		SetPixelMode(olc::Pixel::ALPHA);
+
+		// Convert selected cell coordinate to world space
+		olc::vi2d vSelectedWorld = ToScreen(vSelected.x, vSelected.y);
+
+		// Draw "highlight" tile
+		DrawPartialSprite(vSelectedWorld.x, vSelectedWorld.y, sprIsom, 0 * vTileSize.x, 0, vTileSize.x, vTileSize.y);
+
+		// Go back to normal drawing with no expected transparency
+		SetPixelMode(olc::Pixel::NORMAL);
+
+		// Draw Hovered Cell Boundary
+		//DrawRect(vCell.x * vTileSize.x, vCell.y * vTileSize.y, vTileSize.x, vTileSize.y, olc::RED);
+				
+		// Draw Debug Info
+		DrawString(4, 4, "Mouse   : " + std::to_string(vMouse.x) + ", " + std::to_string(vMouse.y), olc::BLACK);
+		DrawString(4, 14, "Cell    : " + std::to_string(vCell.x) + ", " + std::to_string(vCell.y), olc::BLACK);
+		DrawString(4, 24, "Selected: " + std::to_string(vSelected.x) + ", " + std::to_string(vSelected.y), olc::BLACK);
+		return true;
+	}
+};
+
+
+int main()
+{
+	IsometricDemo demo;
+	if (demo.Construct(512, 480, 2, 2))
+		demo.Start();
+	return 0;
+}