added generating of images with coordinates given by getBrightestSpot

src/main/java/com/cringe_studios/christmastreescanning/scanning/ImageScanner.java

@@ -10,7 +10,7 @@ public class ImageScanner {
 	// TODO maybe use Point2D.Double as return type, so the Points don't have to be
 	// converted to Points2D later down the pipeline during the normalization step
 	static private Point getBrightestSpotGrayscale(BufferedImage grayScaleImage, byte gammaDelta) {
-		int[] imageColors = grayScaleImage.getRGB(0, 0, grayScaleImage.getWidth(), grayScaleImage.getHeight(), null, 0, 0);
+		int[] imageColors = grayScaleImage.getRGB(0, 0, grayScaleImage.getWidth(), grayScaleImage.getHeight(), new int[grayScaleImage.getWidth()*grayScaleImage.getHeight()], 0, 0);
 
 		for (int i = 0; i < imageColors.length; i++) {
 			imageColors[i] &= 0x0000_00FF; // because the image is grayscale, only one component is needed

src/test/java/com/cringe_studios/cristmastreescanning/ExampleTest.java

@@ -1,13 +1,48 @@
 package com.cringe_studios.cristmastreescanning;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+import java.awt.Color;
+import java.awt.Point;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import javax.imageio.ImageIO;
+
 import org.junit.jupiter.api.Test;
 
+import com.cringe_studios.christmastreescanning.scanning.ImageScanner;
+
 public class ExampleTest {
 
 	@Test
 	public void testSus() {
 		assertEquals(1 + 1, 2);
 	}
+	
+	@Test
+	public void generateVisualTestImagees() {
+		Path results;
+		try {
+			results = Files.createTempDirectory("testResult");
+			for(int i = 0; i < 100; i++) {
+				try {
+					BufferedImage image = ImageIO.read(ExampleTest.class.getResourceAsStream("/0_" + i + ".png"));
+					Point p = ImageScanner.getBrightestSpot(image);
+					for(int j = -2; j < 2; j++) {
+						for(int k = -2; k < 2; k++) {
+							if(p.x + j > 0 && p.x + j < image.getWidth() && p.y + k > 0 && p.y + k < image.getHeight()) image.setRGB(p.x + j, p.y + k, Color.red.getRGB());
+						}
+					}
+					ImageIO.write(image, "png", Files.newOutputStream(results.resolve(String.valueOf(i) + ".png")));
+				} catch (IOException e) {
+					e.printStackTrace();
+				}
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
 
 }