Added Test, Added Test image, fixed nasty bug, rethought life choices

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

@@ -3,13 +3,16 @@ package com.cringe_studios.christmastreescanning.scanning;
 import java.awt.geom.Point2D;
 import java.awt.image.BufferedImage;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 public class ImageScanner {
 	public static final byte GAMMA_DELTA_DEFAULT = 0;
 	
-	static private Point2D getBrightestSpotGrayscale(BufferedImage grayScaleImage, byte gammaDelta) {
+	static public Point2D getBrightestSpotGrayscale(BufferedImage grayScaleImage, byte gammaDelta) {
-		int[] imageColors = grayScaleImage.getRGB(0, 0, grayScaleImage.getWidth(), grayScaleImage.getHeight(), new int[grayScaleImage.getWidth() * grayScaleImage.getHeight()], 0, 0);
+		int[] imageColors = new int[grayScaleImage.getWidth() * grayScaleImage.getHeight()];
+		
+		grayScaleImage.getRGB(0, 0, grayScaleImage.getWidth(), grayScaleImage.getHeight(), imageColors, 0, grayScaleImage.getWidth());
 		
 		for (int i = 0; i < imageColors.length; i++) {
 			imageColors[i] &= 0x0000_00FF; // because the image is grayscale, only one component is needed

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

@@ -18,6 +18,7 @@ public class PointInterpolator {
 			ySum += points[i].getY();
 		}
 		
+		//https://math.stackexchange.com/questions/1599095/how-to-find-the-equidistant-middle-point-for-3-points-on-an-arbitrary-polygon
 		return new Point2D.Double( xSum / points.length, ySum / points.length);
 	}
 }

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

@@ -1,4 +1,5 @@
 package com.cringe_studios.cristmastreescanning;
+
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.awt.Color;
@@ -22,18 +23,21 @@ public class ExampleTest {
 		assertEquals(1 + 1, 2);
 	}
 
+	
 	@Test
 	public void generateVisualTestImages() {
 		Path results;
 		try {
 			results = Files.createTempDirectory("testResult");
-			for(int i = 0; i < 100; i++) {
+			for (int i = 0; i < 100; i++) {
 				try {
 					BufferedImage image = ImageIO.read(ExampleTest.class.getResourceAsStream("/0_" + i + ".png"));
 					Point2D p = ImageScanner.getBrightestSpot(image);
-					for(int j = -2; j < 2; j++) {
+					for (int j = -2; j < 2; j++) {
-						for(int k = -2; k < 2; k++) {
+						for (int k = -2; k < 2; k++) {
-							if((int) p.getX() + j > 0 && (int) p.getX() + j < image.getWidth() && (int) p.getY() + k > 0 && (int) p.getY() + k < image.getHeight()) image.setRGB((int) p.getX() + j, (int) p.getY() + k, Color.red.getRGB());
+							if ((int) p.getX() + j > 0 && (int) p.getX() + j < image.getWidth()
+									&& (int) p.getY() + k > 0 && (int) p.getY() + k < image.getHeight())
+								image.setRGB((int) p.getX() + j, (int) p.getY() + k, Color.red.getRGB());
 						}
 					}
 					ImageIO.write(image, "png", Files.newOutputStream(results.resolve(String.valueOf(i) + ".png")));
@@ -47,16 +51,41 @@ public class ExampleTest {
 	}
 
 	@Test
+	public void gradientTest() {
+		Path results;
+		try {
+			results = Files.createTempDirectory("testResultGradient");
+			try {
+				BufferedImage image = ImageIO.read(ExampleTest.class.getResourceAsStream("/gradient.png"));
+				Point2D p = ImageScanner.getBrightestSpotGrayscale(image, (byte)0);
+				for (int j = -2; j < 2; j++) {
+					for (int k = -2; k < 2; k++) {
+						if ((int) p.getX() + j > 0 && (int) p.getX() + j < image.getWidth() && (int) p.getY() + k > 0
+								&& (int) p.getY() + k < image.getHeight())
+							image.setRGB((int) p.getX() + j, (int) p.getY() + k, Color.red.getRGB());
+					}
+				}
+				ImageIO.write(image, "png", Files.newOutputStream(results.resolve(String.valueOf("gradientout") + ".png")));
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
 	public void generateVisualTestImagesWithOldMethod() {
 		Path results;
 		try {
 			results = Files.createTempDirectory("testResultOldWay");
 
-			for(int i = 0; i < 100; i++) {
+			for (int i = 0; i < 100; i++) {
 				try {
 					BufferedImage image = ImageIO.read(ExampleTest.class.getResourceAsStream("/0_" + i + ".png"));
 
-					BufferedImage bi2 = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_RGB);
+					BufferedImage bi2 = new BufferedImage(image.getWidth(), image.getHeight(),
+							BufferedImage.TYPE_INT_RGB);
 					bi2.createGraphics().drawImage(image, 0, 0, null);
 					int[] colors = ((DataBufferInt) bi2.getRaster().getDataBuffer()).getData();
 					int x = -1, y = -1, brightness = 0;
@@ -64,7 +93,7 @@ public class ExampleTest {
 					int boxLeangth = 3;
 
 					while (multipleBright) {
-						if(boxLeangth > 1000) {
+						if (boxLeangth > 1000) {
 							System.out.println("alles gleich hell");
 							return;
 						}
@@ -79,7 +108,8 @@ public class ExampleTest {
 									} else {
 										continue y;
 									}
-									if (c + (k - boxLeangth / 2) * bi2.getWidth() > 0 && c + (k - boxLeangth / 2) * bi2.getWidth() < colors.length) {
+									if (c + (k - boxLeangth / 2) * bi2.getWidth() > 0
+											&& c + (k - boxLeangth / 2) * bi2.getWidth() < colors.length) {
 										c += (k - boxLeangth / 2) * bi2.getWidth();
 									} else {
 										continue x;
@@ -97,14 +127,15 @@ public class ExampleTest {
 								multipleBright = true;
 							}
 						}
-						if(multipleBright) {
+						if (multipleBright) {
 							boxLeangth += 2;
 						}
 					}
 
-					for(int j = -2; j < 2; j++) {
+					for (int j = -2; j < 2; j++) {
-						for(int k = -2; k < 2; k++) {
+						for (int k = -2; k < 2; k++) {
-							if(x + j > 0 && x + j < image.getWidth() && y + k > 0 && y + k < image.getHeight()) image.setRGB(x + j, y + k, Color.red.getRGB());
+							if (x + j > 0 && x + j < image.getWidth() && y + k > 0 && y + k < image.getHeight())
+								image.setRGB(x + j, y + k, Color.red.getRGB());
 						}
 					}
 					ImageIO.write(image, "png", Files.newOutputStream(results.resolve(String.valueOf(i) + ".png")));