From 04982c4798a25a56af95dfecb11b1906dd4e54c0 Mon Sep 17 00:00:00 2001
From: Luke Else <mail@luke-else.co.uk>
Date: Sun, 5 Dec 2021 16:36:56 +0000
Subject: [PATCH] day 5b complete

Had a couple of issues drawing the diagonal lines, got the x and y coordinates on the array mixed up
---
 day5/day 5b/go.mod    |   3 ++
 day5/day 5b/main.go   | 121 ++++++++++++++++++++++++++++++++++++++++++
 day5/day 5b/testInput |  10 ++++
 3 files changed, 134 insertions(+)
 create mode 100644 day5/day 5b/go.mod
 create mode 100644 day5/day 5b/main.go
 create mode 100644 day5/day 5b/testInput

diff --git a/day5/day 5b/go.mod b/day5/day 5b/go.mod
new file mode 100644
index 0000000..e938e2e
--- /dev/null
+++ b/day5/day 5b/go.mod	
@@ -0,0 +1,3 @@
+module PWD
+
+go 1.17
diff --git a/day5/day 5b/main.go b/day5/day 5b/main.go
new file mode 100644
index 0000000..9e3bccc
--- /dev/null
+++ b/day5/day 5b/main.go	
@@ -0,0 +1,121 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"math"
+	"os"
+	"regexp"
+	"strconv"
+)
+
+func main() {
+	content := returnContent("../input")
+	//content := returnContent("testInput")
+
+	gameMap := [1000][1000]int{}
+
+	fmt.Println(run(content, &gameMap))
+
+	for i := 0; i < len(gameMap); i++ {
+		fmt.Println(gameMap[i])
+	}
+}
+
+func run(content *[][]int, gameMap *[1000][1000]int) int {
+	for i := 0; i < len((*content)); i++ {
+		fillMap(gameMap, (*content)[i])
+	}
+
+	count := 0
+
+	for i := 0; i < len(gameMap); i++ {
+		for j := 0; j < len(gameMap[i]); j++ {
+			if gameMap[i][j] > 1 {
+				count++
+			}
+		}
+	}
+	return count
+}
+
+func fillMap(gameMap *[1000][1000]int, coords []int) {
+
+	coord1 := []int{coords[0], coords[1]}
+	coord2 := []int{coords[2], coords[3]}
+
+	if coord1[0] > coord2[0] {
+		//swap values so coord1 is far left value
+		coord1, coord2 = coord2, coord1
+	}
+
+	//4 types of line
+
+	//diagonal up,
+	//diagonal down,
+	//horizontal
+	//vertical  ()
+
+	//Check initially for vertical and horizontal lines
+
+	if coord1[0] == coord2[0] {
+		//Continue down vertical line
+		for i := int(math.Min(float64(coord1[1]), float64(coord2[1]))); i <= int(math.Max(float64(coord1[1]), float64(coord2[1]))); i++ {
+			(*gameMap)[i][coord1[0]]++
+		}
+	} else if coord1[1] == coord2[1] {
+		//fill horizontal line in
+		for i := coord1[0]; i <= coord2[0]; i++ {
+			(*gameMap)[coord1[1]][i]++
+		}
+	} else {
+		//Now check for diagonal lines
+
+		if coord1[1] <= coord2[1] {
+			//Diagonal up and to the right
+			height := coord1[1]
+
+			for i := coord1[0]; i <= coord2[0]; i++ {
+				(*gameMap)[height][i]++
+				height++
+			}
+		} else {
+			//Diagonal down and to the right
+			height := coord1[1]
+
+			for i := coord1[0]; i <= coord2[0]; i++ {
+				(*gameMap)[height][i]++
+				height--
+			}
+		}
+
+	}
+
+}
+
+func returnContent(path string) *[][]int {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content [][]int
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	regex := regexp.MustCompile("([0-9]+)")
+	for scanner.Scan() {
+		stringValues := regex.FindAllString(scanner.Text(), 4)
+		intValues := []int{}
+		for _, v := range stringValues {
+			num, _ := strconv.Atoi(v)
+			intValues = append(intValues, num)
+		}
+		content = append(content, intValues)
+	}
+
+	return &content
+}
diff --git a/day5/day 5b/testInput b/day5/day 5b/testInput
new file mode 100644
index 0000000..1d4e36d
--- /dev/null
+++ b/day5/day 5b/testInput	
@@ -0,0 +1,10 @@
+0,9 -> 5,9
+8,0 -> 0,8
+9,4 -> 3,4
+2,2 -> 2,1
+7,0 -> 7,4
+6,4 -> 2,0
+0,9 -> 2,9
+3,4 -> 1,4
+0,0 -> 8,8
+5,5 -> 8,2
\ No newline at end of file