91 lines
2.5 KiB
D
91 lines
2.5 KiB
D
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module day13.part1;
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import std.file;
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import std.stdio;
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import std.string;
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import std.conv;
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import std.algorithm;
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import std.array;
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struct Point {
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int x;
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int y;
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}
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enum LineType {
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HORIZONTAL,
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VERTICAL
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}
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struct Line {
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LineType type;
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int value;
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}
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Point[] foldOver(ref Point[] points, Line line) {
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Point[] newPoints = [];
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void add(ref Point[] pts, Point p) {
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if (!canFind(pts, p)) pts ~= p;
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}
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foreach (i, point; points) {
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if (line.type == LineType.HORIZONTAL) {
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if (point.y < line.value) {
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add(newPoints, point);
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} else {
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int reflectedY = line.value - (point.y - line.value);
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if (reflectedY < line.value && reflectedY >= 0) {
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add(newPoints, Point(point.x, reflectedY));
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}
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}
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} else if (line.type == LineType.VERTICAL) {
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if (point.x < line.value) {
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add(newPoints, point);
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} else {
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int reflectedX = line.value - (point.x - line.value);
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if (reflectedX < line.value && reflectedX >= 0) {
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add(newPoints, Point(reflectedX, point.y));
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}
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}
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}
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}
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return newPoints;
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}
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void print(Point[] points) {
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int maxX = points.map!(p => p.x).maxElement;
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int maxY = points.map!(p => p.y).maxElement;
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foreach (y; 0..maxY + 1) {
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foreach (x; 0..maxX + 1) {
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bool pointExists = points.any!(p => p.x == x && p.y == y);
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writef("%c", pointExists ? '#' : '.');
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}
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writeln;
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}
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}
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void transparentOrigami() {
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string[] textBlocks = readText("source/day13/input.txt").strip.split("\r\n\r\n");
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writeln(textBlocks);
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Point[] points = textBlocks[0].split("\n")
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.filter!(line => line.strip.length > 0)
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.map!((line) {
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string[] parts = line.strip.split(",");
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return Point(parts[0].to!int, parts[1].to!int);
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}).array;
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Line[] lines = textBlocks[1].split("\n")
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.map!((line) {
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string[] parts = line.strip.split("=");
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LineType type = parts[0][$ - 1] == 'x' ? LineType.VERTICAL : LineType.HORIZONTAL;
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int value = parts[1].to!int;
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return Line(type, value);
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}).array;
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points.writeln;
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lines.writeln;
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foreach (i, line; lines) {
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points = foldOver(points, line);
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writefln("After fold %d, %d dots are visible.", i + 1, points.length);
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}
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print(points);
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}
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