JavaFX color picker












2












$begingroup$


I am making my own JavaFX color picker just for learning more about JavaFX. I am rendering color wheel in JavaFX using WritableImage and I have renderImage method to render color wheel in my program. And I am using Slider to change brightness of the color wheel.



The code is working fine but it's rendering slower. And the other reason I asked this question is also to learn about fast rendering algorithms in Java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource(As suggested in comment below) won't work.



How can I improve my code to render the color wheel faster?



import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.control.Slider;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

import static java.lang.Math.atan2;
import static java.lang.Math.toDegrees;

public class Example extends Application{

private static final int ANTIALIASING_BASE = 3;

private WritableImage writableImage;
private PixelWriter pixelWriter;
private Canvas canvas;

private IntegerProperty w;
private IntegerProperty h;
private Slider slider;

public static void main(String... arguments){
launch(arguments);
}

@Override
public void start(Stage primaryStage){

w = new SimpleIntegerProperty(255 + 42);
h = new SimpleIntegerProperty(360);
slider = new Slider(0, 100, 100);

primaryStage.setWidth(w.get());
primaryStage.setHeight(h.get());

canvas = new Canvas(255, 255);
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();

canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();

slider.valueProperty().addListener(this::change);

VBox root = new VBox(12.5, canvas, slider);
root.setPadding(new Insets(12.5));

primaryStage.setScene(new Scene(root));
primaryStage.setResizable(false);
primaryStage.show();
}

//method to change brightness using slider
private void change(Observable observable){
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();
canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();
}

//method that renders color wheel image
private void renderImage(){
for(int x = 0; x < 255; x++){
for(int y = 0; y < 255; y++){
Color c = getAntialiasedPixel(x, y);
if(c.getRed() == 0.0 && c.getGreen() == 0.0 && c.getBlue() == 0.0
&& slider.valueProperty().get() != 0.0){
c = Color.web("#f4f4f4");
}
pixelWriter.setColor(x, y, c);
}
}

}

//method that calculates color
private Color getColor(double x, double y){

double distance = getDistance(x, y);

if(distance > 127.5){
return Color.web("#f4f4f4");
}

double h = getAngle(x, y);
double s = (distance / 127.5);
double b = slider.valueProperty().get() / 100;

return Color.hsb(h, s, b);
}

//method to make color wheel look smoother
private Color getAntialiasedPixel(int x, int y){
double step = 1d / ANTIALIASING_BASE;
double N = ANTIALIASING_BASE * ANTIALIASING_BASE;
double r = 0, g = 0, b = 0;

for(int i = 0; i < ANTIALIASING_BASE; i++){
for(int j = 0; j < ANTIALIASING_BASE; j++){
Color c = getColor(x + step * (i + 0.5) - 0.5,
y + step * (j + 0.5) - 0.5);
r += c.getRed() / N;
g += c.getGreen() / N;
b += c.getBlue() / N;
}
}

return new Color(clamp(r), clamp(g), clamp(b), 1);
}

private double clamp(double val){
return val > 1 ? 1 : val < 0 ? 0 : val;
}

private double getDistance(double x1, double y1){
var y = 127.5 - y1;
var x = 127.5 - x1;
return Math.sqrt(y * y + x * x);
}

private double getAngle(double x1, double y1){
var angle = toDegrees(atan2(y1 - 127.5, x1 - 127.5));
if(angle < 0) angle += 360;
return angle;
}

}









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New contributor




thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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$endgroup$












  • $begingroup$
    The solution (as in the JavaScript) is to create an image of the color wheel, and render that. One might create the colorwheel in java, but outside the project and store the image as resource in the project.
    $endgroup$
    – Joop Eggen
    13 hours ago










  • $begingroup$
    Okay. but the reason I asked this question is also to learn about fast rendering algorithms in java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource won't work. I hope you are understanding the problem.
    $endgroup$
    – thepooran
    13 hours ago












  • $begingroup$
    Interlaced JPEG can be hi-res and fast show a lower resolution smaller scaled image. The CSS support of FX might be interesting (gradients). Pixel oriented processing is indeed suboptimal. Will be interesting to see the answers.
    $endgroup$
    – Joop Eggen
    13 hours ago


















2












$begingroup$


I am making my own JavaFX color picker just for learning more about JavaFX. I am rendering color wheel in JavaFX using WritableImage and I have renderImage method to render color wheel in my program. And I am using Slider to change brightness of the color wheel.



The code is working fine but it's rendering slower. And the other reason I asked this question is also to learn about fast rendering algorithms in Java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource(As suggested in comment below) won't work.



How can I improve my code to render the color wheel faster?



import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.control.Slider;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

import static java.lang.Math.atan2;
import static java.lang.Math.toDegrees;

public class Example extends Application{

private static final int ANTIALIASING_BASE = 3;

private WritableImage writableImage;
private PixelWriter pixelWriter;
private Canvas canvas;

private IntegerProperty w;
private IntegerProperty h;
private Slider slider;

public static void main(String... arguments){
launch(arguments);
}

@Override
public void start(Stage primaryStage){

w = new SimpleIntegerProperty(255 + 42);
h = new SimpleIntegerProperty(360);
slider = new Slider(0, 100, 100);

primaryStage.setWidth(w.get());
primaryStage.setHeight(h.get());

canvas = new Canvas(255, 255);
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();

canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();

slider.valueProperty().addListener(this::change);

VBox root = new VBox(12.5, canvas, slider);
root.setPadding(new Insets(12.5));

primaryStage.setScene(new Scene(root));
primaryStage.setResizable(false);
primaryStage.show();
}

//method to change brightness using slider
private void change(Observable observable){
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();
canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();
}

//method that renders color wheel image
private void renderImage(){
for(int x = 0; x < 255; x++){
for(int y = 0; y < 255; y++){
Color c = getAntialiasedPixel(x, y);
if(c.getRed() == 0.0 && c.getGreen() == 0.0 && c.getBlue() == 0.0
&& slider.valueProperty().get() != 0.0){
c = Color.web("#f4f4f4");
}
pixelWriter.setColor(x, y, c);
}
}

}

//method that calculates color
private Color getColor(double x, double y){

double distance = getDistance(x, y);

if(distance > 127.5){
return Color.web("#f4f4f4");
}

double h = getAngle(x, y);
double s = (distance / 127.5);
double b = slider.valueProperty().get() / 100;

return Color.hsb(h, s, b);
}

//method to make color wheel look smoother
private Color getAntialiasedPixel(int x, int y){
double step = 1d / ANTIALIASING_BASE;
double N = ANTIALIASING_BASE * ANTIALIASING_BASE;
double r = 0, g = 0, b = 0;

for(int i = 0; i < ANTIALIASING_BASE; i++){
for(int j = 0; j < ANTIALIASING_BASE; j++){
Color c = getColor(x + step * (i + 0.5) - 0.5,
y + step * (j + 0.5) - 0.5);
r += c.getRed() / N;
g += c.getGreen() / N;
b += c.getBlue() / N;
}
}

return new Color(clamp(r), clamp(g), clamp(b), 1);
}

private double clamp(double val){
return val > 1 ? 1 : val < 0 ? 0 : val;
}

private double getDistance(double x1, double y1){
var y = 127.5 - y1;
var x = 127.5 - x1;
return Math.sqrt(y * y + x * x);
}

private double getAngle(double x1, double y1){
var angle = toDegrees(atan2(y1 - 127.5, x1 - 127.5));
if(angle < 0) angle += 360;
return angle;
}

}









share|improve this question









New contributor




thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$












  • $begingroup$
    The solution (as in the JavaScript) is to create an image of the color wheel, and render that. One might create the colorwheel in java, but outside the project and store the image as resource in the project.
    $endgroup$
    – Joop Eggen
    13 hours ago










  • $begingroup$
    Okay. but the reason I asked this question is also to learn about fast rendering algorithms in java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource won't work. I hope you are understanding the problem.
    $endgroup$
    – thepooran
    13 hours ago












  • $begingroup$
    Interlaced JPEG can be hi-res and fast show a lower resolution smaller scaled image. The CSS support of FX might be interesting (gradients). Pixel oriented processing is indeed suboptimal. Will be interesting to see the answers.
    $endgroup$
    – Joop Eggen
    13 hours ago
















2












2








2





$begingroup$


I am making my own JavaFX color picker just for learning more about JavaFX. I am rendering color wheel in JavaFX using WritableImage and I have renderImage method to render color wheel in my program. And I am using Slider to change brightness of the color wheel.



The code is working fine but it's rendering slower. And the other reason I asked this question is also to learn about fast rendering algorithms in Java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource(As suggested in comment below) won't work.



How can I improve my code to render the color wheel faster?



import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.control.Slider;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

import static java.lang.Math.atan2;
import static java.lang.Math.toDegrees;

public class Example extends Application{

private static final int ANTIALIASING_BASE = 3;

private WritableImage writableImage;
private PixelWriter pixelWriter;
private Canvas canvas;

private IntegerProperty w;
private IntegerProperty h;
private Slider slider;

public static void main(String... arguments){
launch(arguments);
}

@Override
public void start(Stage primaryStage){

w = new SimpleIntegerProperty(255 + 42);
h = new SimpleIntegerProperty(360);
slider = new Slider(0, 100, 100);

primaryStage.setWidth(w.get());
primaryStage.setHeight(h.get());

canvas = new Canvas(255, 255);
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();

canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();

slider.valueProperty().addListener(this::change);

VBox root = new VBox(12.5, canvas, slider);
root.setPadding(new Insets(12.5));

primaryStage.setScene(new Scene(root));
primaryStage.setResizable(false);
primaryStage.show();
}

//method to change brightness using slider
private void change(Observable observable){
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();
canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();
}

//method that renders color wheel image
private void renderImage(){
for(int x = 0; x < 255; x++){
for(int y = 0; y < 255; y++){
Color c = getAntialiasedPixel(x, y);
if(c.getRed() == 0.0 && c.getGreen() == 0.0 && c.getBlue() == 0.0
&& slider.valueProperty().get() != 0.0){
c = Color.web("#f4f4f4");
}
pixelWriter.setColor(x, y, c);
}
}

}

//method that calculates color
private Color getColor(double x, double y){

double distance = getDistance(x, y);

if(distance > 127.5){
return Color.web("#f4f4f4");
}

double h = getAngle(x, y);
double s = (distance / 127.5);
double b = slider.valueProperty().get() / 100;

return Color.hsb(h, s, b);
}

//method to make color wheel look smoother
private Color getAntialiasedPixel(int x, int y){
double step = 1d / ANTIALIASING_BASE;
double N = ANTIALIASING_BASE * ANTIALIASING_BASE;
double r = 0, g = 0, b = 0;

for(int i = 0; i < ANTIALIASING_BASE; i++){
for(int j = 0; j < ANTIALIASING_BASE; j++){
Color c = getColor(x + step * (i + 0.5) - 0.5,
y + step * (j + 0.5) - 0.5);
r += c.getRed() / N;
g += c.getGreen() / N;
b += c.getBlue() / N;
}
}

return new Color(clamp(r), clamp(g), clamp(b), 1);
}

private double clamp(double val){
return val > 1 ? 1 : val < 0 ? 0 : val;
}

private double getDistance(double x1, double y1){
var y = 127.5 - y1;
var x = 127.5 - x1;
return Math.sqrt(y * y + x * x);
}

private double getAngle(double x1, double y1){
var angle = toDegrees(atan2(y1 - 127.5, x1 - 127.5));
if(angle < 0) angle += 360;
return angle;
}

}









share|improve this question









New contributor




thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.







$endgroup$




I am making my own JavaFX color picker just for learning more about JavaFX. I am rendering color wheel in JavaFX using WritableImage and I have renderImage method to render color wheel in my program. And I am using Slider to change brightness of the color wheel.



The code is working fine but it's rendering slower. And the other reason I asked this question is also to learn about fast rendering algorithms in Java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource(As suggested in comment below) won't work.



How can I improve my code to render the color wheel faster?



import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.control.Slider;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

import static java.lang.Math.atan2;
import static java.lang.Math.toDegrees;

public class Example extends Application{

private static final int ANTIALIASING_BASE = 3;

private WritableImage writableImage;
private PixelWriter pixelWriter;
private Canvas canvas;

private IntegerProperty w;
private IntegerProperty h;
private Slider slider;

public static void main(String... arguments){
launch(arguments);
}

@Override
public void start(Stage primaryStage){

w = new SimpleIntegerProperty(255 + 42);
h = new SimpleIntegerProperty(360);
slider = new Slider(0, 100, 100);

primaryStage.setWidth(w.get());
primaryStage.setHeight(h.get());

canvas = new Canvas(255, 255);
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();

canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();

slider.valueProperty().addListener(this::change);

VBox root = new VBox(12.5, canvas, slider);
root.setPadding(new Insets(12.5));

primaryStage.setScene(new Scene(root));
primaryStage.setResizable(false);
primaryStage.show();
}

//method to change brightness using slider
private void change(Observable observable){
writableImage = new WritableImage(255, 255);
pixelWriter = writableImage.getPixelWriter();
canvas.getGraphicsContext2D()
.drawImage(writableImage, 0, 0, w.get(), h.get(), 0, 0, w.get(), h.get());

renderImage();
}

//method that renders color wheel image
private void renderImage(){
for(int x = 0; x < 255; x++){
for(int y = 0; y < 255; y++){
Color c = getAntialiasedPixel(x, y);
if(c.getRed() == 0.0 && c.getGreen() == 0.0 && c.getBlue() == 0.0
&& slider.valueProperty().get() != 0.0){
c = Color.web("#f4f4f4");
}
pixelWriter.setColor(x, y, c);
}
}

}

//method that calculates color
private Color getColor(double x, double y){

double distance = getDistance(x, y);

if(distance > 127.5){
return Color.web("#f4f4f4");
}

double h = getAngle(x, y);
double s = (distance / 127.5);
double b = slider.valueProperty().get() / 100;

return Color.hsb(h, s, b);
}

//method to make color wheel look smoother
private Color getAntialiasedPixel(int x, int y){
double step = 1d / ANTIALIASING_BASE;
double N = ANTIALIASING_BASE * ANTIALIASING_BASE;
double r = 0, g = 0, b = 0;

for(int i = 0; i < ANTIALIASING_BASE; i++){
for(int j = 0; j < ANTIALIASING_BASE; j++){
Color c = getColor(x + step * (i + 0.5) - 0.5,
y + step * (j + 0.5) - 0.5);
r += c.getRed() / N;
g += c.getGreen() / N;
b += c.getBlue() / N;
}
}

return new Color(clamp(r), clamp(g), clamp(b), 1);
}

private double clamp(double val){
return val > 1 ? 1 : val < 0 ? 0 : val;
}

private double getDistance(double x1, double y1){
var y = 127.5 - y1;
var x = 127.5 - x1;
return Math.sqrt(y * y + x * x);
}

private double getAngle(double x1, double y1){
var angle = toDegrees(atan2(y1 - 127.5, x1 - 127.5));
if(angle < 0) angle += 360;
return angle;
}

}






java javafx






share|improve this question









New contributor




thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 22 mins ago









Jamal

30.3k11117227




30.3k11117227






New contributor




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Check out our Code of Conduct.









asked 14 hours ago









thepooranthepooran

1114




1114




New contributor




thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






thepooran is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • $begingroup$
    The solution (as in the JavaScript) is to create an image of the color wheel, and render that. One might create the colorwheel in java, but outside the project and store the image as resource in the project.
    $endgroup$
    – Joop Eggen
    13 hours ago










  • $begingroup$
    Okay. but the reason I asked this question is also to learn about fast rendering algorithms in java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource won't work. I hope you are understanding the problem.
    $endgroup$
    – thepooran
    13 hours ago












  • $begingroup$
    Interlaced JPEG can be hi-res and fast show a lower resolution smaller scaled image. The CSS support of FX might be interesting (gradients). Pixel oriented processing is indeed suboptimal. Will be interesting to see the answers.
    $endgroup$
    – Joop Eggen
    13 hours ago




















  • $begingroup$
    The solution (as in the JavaScript) is to create an image of the color wheel, and render that. One might create the colorwheel in java, but outside the project and store the image as resource in the project.
    $endgroup$
    – Joop Eggen
    13 hours ago










  • $begingroup$
    Okay. but the reason I asked this question is also to learn about fast rendering algorithms in java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource won't work. I hope you are understanding the problem.
    $endgroup$
    – thepooran
    13 hours ago












  • $begingroup$
    Interlaced JPEG can be hi-res and fast show a lower resolution smaller scaled image. The CSS support of FX might be interesting (gradients). Pixel oriented processing is indeed suboptimal. Will be interesting to see the answers.
    $endgroup$
    – Joop Eggen
    13 hours ago


















$begingroup$
The solution (as in the JavaScript) is to create an image of the color wheel, and render that. One might create the colorwheel in java, but outside the project and store the image as resource in the project.
$endgroup$
– Joop Eggen
13 hours ago




$begingroup$
The solution (as in the JavaScript) is to create an image of the color wheel, and render that. One might create the colorwheel in java, but outside the project and store the image as resource in the project.
$endgroup$
– Joop Eggen
13 hours ago












$begingroup$
Okay. but the reason I asked this question is also to learn about fast rendering algorithms in java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource won't work. I hope you are understanding the problem.
$endgroup$
– thepooran
13 hours ago






$begingroup$
Okay. but the reason I asked this question is also to learn about fast rendering algorithms in java because if I make something else like Mandelbrot set or If I want to zoom that canvas containing WritableImage then just using image as resource won't work. I hope you are understanding the problem.
$endgroup$
– thepooran
13 hours ago














$begingroup$
Interlaced JPEG can be hi-res and fast show a lower resolution smaller scaled image. The CSS support of FX might be interesting (gradients). Pixel oriented processing is indeed suboptimal. Will be interesting to see the answers.
$endgroup$
– Joop Eggen
13 hours ago






$begingroup$
Interlaced JPEG can be hi-res and fast show a lower resolution smaller scaled image. The CSS support of FX might be interesting (gradients). Pixel oriented processing is indeed suboptimal. Will be interesting to see the answers.
$endgroup$
– Joop Eggen
13 hours ago












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