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close #4204
This commit is contained in:
acbin
2023-06-09 18:52:05 +08:00
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parent ad03086f54
commit 00282efd8b
521 changed files with 5233 additions and 7309 deletions
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97
src/main/java/com/thealgorithms/others/Mandelbrot.java
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@ -27,23 +27,13 @@ public class Mandelbrot {
public static void main(String[] args) {
// Test black and white
BufferedImage blackAndWhiteImage = getImage(
800,
600,
-0.6,
0,
3.2,
50,
false
);
BufferedImage blackAndWhiteImage = getImage(800, 600, -0.6, 0, 3.2, 50, false);
// Pixel outside the Mandelbrot set should be white.
assert blackAndWhiteImage.getRGB(0, 0) ==
new Color(255, 255, 255).getRGB();
assert blackAndWhiteImage.getRGB(0, 0) == new Color(255, 255, 255).getRGB();
// Pixel inside the Mandelbrot set should be black.
assert blackAndWhiteImage.getRGB(400, 300) ==
new Color(0, 0, 0).getRGB();
assert blackAndWhiteImage.getRGB(400, 300) == new Color(0, 0, 0).getRGB();
// Test color-coding
BufferedImage coloredImage = getImage(800, 600, -0.6, 0, 3.2, 50, true);
@ -80,63 +70,38 @@ public class Mandelbrot {
* @param useDistanceColorCoding Render in color or black and white.
* @return The image of the rendered Mandelbrot set.
*/
public static BufferedImage getImage(
int imageWidth,
int imageHeight,
double figureCenterX,
double figureCenterY,
double figureWidth,
int maxStep,
boolean useDistanceColorCoding
) {
public static BufferedImage getImage(int imageWidth, int imageHeight, double figureCenterX,
double figureCenterY, double figureWidth, int maxStep, boolean useDistanceColorCoding) {
if (imageWidth <= 0) {
throw new IllegalArgumentException(
"imageWidth should be greater than zero"
);
throw new IllegalArgumentException("imageWidth should be greater than zero");
}
if (imageHeight <= 0) {
throw new IllegalArgumentException(
"imageHeight should be greater than zero"
);
throw new IllegalArgumentException("imageHeight should be greater than zero");
}
if (maxStep <= 0) {
throw new IllegalArgumentException(
"maxStep should be greater than zero"
);
throw new IllegalArgumentException("maxStep should be greater than zero");
}
BufferedImage image = new BufferedImage(
imageWidth,
imageHeight,
BufferedImage.TYPE_INT_RGB
);
BufferedImage image
= new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
double figureHeight = figureWidth / imageWidth * imageHeight;
// loop through the image-coordinates
for (int imageX = 0; imageX < imageWidth; imageX++) {
for (int imageY = 0; imageY < imageHeight; imageY++) {
// determine the figure-coordinates based on the image-coordinates
double figureX =
figureCenterX +
((double) imageX / imageWidth - 0.5) *
figureWidth;
double figureY =
figureCenterY +
((double) imageY / imageHeight - 0.5) *
figureHeight;
double figureX = figureCenterX + ((double) imageX / imageWidth - 0.5) * figureWidth;
double figureY
= figureCenterY + ((double) imageY / imageHeight - 0.5) * figureHeight;
double distance = getDistance(figureX, figureY, maxStep);
// color the corresponding pixel based on the selected coloring-function
image.setRGB(
imageX,
imageY,
useDistanceColorCoding
? colorCodedColorMap(distance).getRGB()
: blackAndWhiteColorMap(distance).getRGB()
);
image.setRGB(imageX, imageY,
useDistanceColorCoding ? colorCodedColorMap(distance).getRGB()
: blackAndWhiteColorMap(distance).getRGB());
}
}
@ -179,18 +144,18 @@ public class Mandelbrot {
int t = (int) (val * (1 - (1 - f) * saturation));
switch (hi) {
case 0:
return new Color(v, t, p);
case 1:
return new Color(q, v, p);
case 2:
return new Color(p, v, t);
case 3:
return new Color(p, q, v);
case 4:
return new Color(t, p, v);
default:
return new Color(v, p, q);
case 0:
return new Color(v, t, p);
case 1:
return new Color(q, v, p);
case 2:
return new Color(p, v, t);
case 3:
return new Color(p, q, v);
case 4:
return new Color(t, p, v);
default:
return new Color(v, p, q);
}
}
}
@ -205,11 +170,7 @@ public class Mandelbrot {
* @param maxStep Maximum number of steps to check for divergent behavior.
* @return The relative distance as the ratio of steps taken to maxStep.
*/
private static double getDistance(
double figureX,
double figureY,
int maxStep
) {
private static double getDistance(double figureX, double figureY, int maxStep) {
double a = figureX;
double b = figureY;
int currentStep = 0;