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@@ -74,6 +74,63 @@ func part1(commands []command) int {
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return result
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}
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+func inSprite(pixel int, sprite int) bool {
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+ return pixel >= sprite-1 && pixel <= sprite+1
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+}
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+
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+func putMark(pixel int, sprite int) byte {
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+ if inSprite(pixel, sprite) {
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+ return '#'
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+ }
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+
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+ return '.'
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+}
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+
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+func part2(commands []command) [][]byte {
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+ sprite := 1
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+ currentLimit := 40
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+ period := 40
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+ absoluteLimit := 220
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+ cycles := 0
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+ totalCycles := 0
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+ var result [][]byte
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+ currentRow := make([]byte, period)
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+
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+ for i := range commands {
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+ if cycles > absoluteLimit {
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+ break
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+ }
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+
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+ end := 1
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+ if commands[i].instruction == addx {
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+ end++
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+ }
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+
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+ for j := 0; j < end; j++ {
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+ cycles++
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+ currentRow[cycles-1] = putMark(cycles-1, sprite)
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+ if cycles == currentLimit {
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+ result = append(result, currentRow)
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+ totalCycles += cycles
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+ currentRow = make([]byte, period)
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+ cycles = 0
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+ }
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+ }
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+
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+ if commands[i].instruction == addx {
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+ sprite += commands[i].value
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+ }
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+ }
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+
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+ return result
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+}
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+
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+func printScreen(screen [][]byte) {
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+ for i := range screen {
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+ fmt.Println(string(screen[i]))
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+ }
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+}
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+
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func main() {
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if len(os.Args) < 2 {
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log.Fatal("You need to specify a file!")
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@@ -88,4 +145,6 @@ func main() {
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commands := readInput(file)
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fmt.Println("Part1:", part1(commands))
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+ fmt.Println("Part2:")
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+ printScreen(part2(commands))
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}
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