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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;
}