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