2 files changed, 46 insertions(+), 4 deletions(-)

M cmd/day8/main.go
A cmd/day8/simple_image_data2.txt

@@ 28,10 28,12 @@ func loadImageData(filename string) string {
 }
 
 const (
-	imageWidth      = 25
-	imageHeight     = 6
-	testImageWidth  = 3
-	testImageHeight = 2
+	imageWidth       = 25
+	imageHeight      = 6
+	testImageWidth   = 3
+	testImageHeight  = 2
+	testImage2Width  = 2
+	testImage2Height = 2
 )
 
 type Layer [imageHeight][imageWidth]int


@@ 94,6 96,41 @@ func findImageChecksum(layer Layer) int {
 	return ones * twos
 }
 
+const (
+	BLACK       = 0
+	WHITE       = 1
+	TRANSPARENT = 2
+)
+
+func renderFinalImage(layers []Layer) Layer {
+	final := layers[0]
+
+	for _, l := range layers[1:] {
+		for ii := 0; ii < len(l); ii++ {
+			for jj := 0; jj < len(l[ii]); jj++ {
+				if final[ii][jj] == TRANSPARENT {
+					final[ii][jj] = l[ii][jj]
+				}
+			}
+		}
+	}
+
+	return final
+}
+
+func displayRenderedImage(layer Layer) {
+	for ii := 0; ii < len(layer); ii++ {
+		for jj := 0; jj < len(layer[ii]); jj++ {
+			if layer[ii][jj] == BLACK {
+				print("@@@")
+			} else {
+				print("   ")
+			}
+		}
+		println()
+	}
+}
+
 func main() {
 	imageData := loadImageData(os.Args[1])
 	println("imageData: ", imageData)


@@ 103,4 140,8 @@ func main() {
 
 	fmt.Printf("lowestZeroLayer: %v\n", lowestZeroLayer)
 	fmt.Printf("[Part 1] Answer: %v\n", findImageChecksum(lowestZeroLayer))
+	println()
+	println("[Part 2] Answer:")
+	renderedImage := renderFinalImage(layers)
+	displayRenderedImage(renderedImage)
 }

@@ 0,0 1,1 @@
+0222112222120000<
\ No newline at end of file