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#include "Randomizer2Core.h"
#include "Puzzle.h"
#include "Random.h"
#include <string>
#include <iostream>
#include <cassert>
std::vector<Pos> Randomizer2Core::CutEdges(const Puzzle& p, size_t numEdges, bool allowEdges) {
std::vector<Pos> edges;
int xMin = allowEdges ? 0 : 1;
int xMax = allowEdges ? p.width : p.width-1;
int yMin = allowEdges ? 0 : 1;
int yMax = allowEdges ? p.height : p.height-1;
for (int x=xMin; x<xMax; x++) {
for (int y=yMin; y<yMax; y++) {
if (x%2 == y%2) continue;
if (p.grid[x][y].gap != Cell::Gap::NONE) continue;
if (p.grid[x][y].start) continue;
if (p.grid[x][y].end != Cell::Dir::NONE) continue;
// If the puzzle already has a sequence, don't cut along it.
bool inSequence = false;
for (Pos pos : p.sequence) inSequence |= (pos.x == x && pos.y == y);
if (inSequence) continue;
edges.emplace_back(x, y);
}
}
return CutEdgesInternal(p, edges, numEdges);
}
std::vector<Pos> Randomizer2Core::CutEdgesInternal(const Puzzle& p, std::vector<Pos>& edges, size_t numEdges) {
auto [colorGrid, numColors] = CreateColorGrid(p);
assert(numEdges <= numColors);
std::vector<Pos> cutEdges;
for (int i=0; i<numEdges; i++) {
for (int j=0; j<edges.size(); j++) {
int edge = Random::RandInt(0, static_cast<int>(edges.size() - 1));
Pos pos = edges[edge];
edges.erase(edges.begin() + edge);
int color1 = 0;
int color2 = 0;
if (pos.x%2 == 0 && pos.y%2 == 1) { // Vertical
if (pos.x > 0) color1 = colorGrid[pos.x-1][pos.y];
else color1 = 1;
if (pos.x < p.width - 1) color2 = colorGrid[pos.x+1][pos.y];
else color2 = 1;
} else { // Horizontal
assert(pos.x%2 == 1 && pos.y%2 == 0);
if (pos.y > 0) color1 = colorGrid[pos.x][pos.y-1];
else color1 = 1;
if (pos.y < p.height - 1) color2 = colorGrid[pos.x][pos.y+1];
else color2 = 1;
}
// Enforce color1 < color2
if (color1 > color2) std::swap(color1, color2);
// Colors mismatch, valid cut
if (color1 != color2) {
// @Performance... have a lookup table instead?
for (int x=0; x<p.width; x++) {
for (int y=0; y<p.height; y++) {
if (colorGrid[x][y] == color2) colorGrid[x][y] = color1;
}
}
cutEdges.emplace_back(pos);
break;
}
}
}
assert(cutEdges.size() == numEdges);
return cutEdges;
}
#ifndef NDEBUG
#include <Windows.h>
#endif
void Randomizer2Core::DebugColorGrid(const std::vector<std::vector<int>>& colorGrid) {
#ifndef NDEBUG
for (int y=0; y<colorGrid[0].size(); y++) {
std::string row;
for (int x=0; x<colorGrid.size(); x++) {
row += std::to_string(colorGrid[x][y]);
}
row += "\n";
OutputDebugStringA(row.c_str());
}
OutputDebugStringA("\n");
#endif
}
void Randomizer2Core::FloodFill(const Puzzle& p, std::vector<std::vector<int>>& colorGrid, int color, int x, int y) {
if (!p.SafeCell(x, y)) return;
if (colorGrid[x][y] != 0) return; // Already processed.
colorGrid[x][y] = color;
FloodFill(p, colorGrid, color, x, y+1);
FloodFill(p, colorGrid, color, x, y-1);
FloodFill(p, colorGrid, color, x+1, y);
FloodFill(p, colorGrid, color, x-1, y);
}
void Randomizer2Core::FloodFillOutside(const Puzzle& p, std::vector<std::vector<int>>& colorGrid, int x, int y) {
if (!p.SafeCell(x, y)) return;
if (colorGrid[x][y] != 0) return; // Already processed.
if (x%2 != y%2 && p.grid[x][y].gap == Cell::Gap::NONE) return; // Only flood-fill through gaps
colorGrid[x][y] = 1; // Outside color
FloodFillOutside(p, colorGrid, x, y+1);
FloodFillOutside(p, colorGrid, x, y-1);
FloodFillOutside(p, colorGrid, x+1, y);
FloodFillOutside(p, colorGrid, x-1, y);
}
/*
undefined -> 1 (color of outside) or * (any colored cell) or -1 (edge/intersection not part of any region)
0 -> {} (this is a special edge case, which I don't need right now)
1 -> 0 (uncolored / ready to color)
2 ->
*/
std::tuple<std::vector<std::vector<int>>, int> Randomizer2Core::CreateColorGrid(const Puzzle& p) {
std::vector<std::vector<int>> colorGrid;
colorGrid.resize(p.width);
for (int x=0; x<p.width; x++) {
colorGrid[x].resize(p.height);
for (int y=0; y<p.height; y++) {
// Mark all unbroken edges and intersections as 'do not color'
if (x%2 != y%2) {
if (p.grid[x][y].gap == Cell::Gap::NONE) colorGrid[x][y] = 1;
} else if (x%2 == 0 && y%2 == 0) {
// @Future: What about empty intersections?
colorGrid[x][y] = 1; // do not color intersections
}
}
}
// @Future: Skip this loop if pillar = true;
for (int y=1; y<p.height; y+=2) {
FloodFillOutside(p, colorGrid, 0, y);
FloodFillOutside(p, colorGrid, p.width - 1, y);
}
for (int x=1; x<p.width; x+=2) {
FloodFillOutside(p, colorGrid, x, 0);
FloodFillOutside(p, colorGrid, x, p.height - 1);
}
int color = 1;
for (int x=0; x<p.width; x++) {
for (int y=0; y<p.height; y++) {
if (colorGrid[x][y] != 0) continue; // No dead colors
color++;
FloodFill(p, colorGrid, color, x, y);
}
}
return {colorGrid, color};
}
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