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How to change color of lines in each iteration of a for loop in Java
How do I efficiently iterate over each entry in a Java Map?How does the Java 'for each' loop work?How do I call one constructor from another in Java?How do I read / convert an InputStream into a String in Java?How do I generate random integers within a specific range in Java?How do I break out of nested loops in Java?A 'for' loop to iterate over an enum in JavaHow do I determine whether an array contains a particular value in Java?How do I declare and initialize an array in Java?How do I convert a String to an int in Java?
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I have an ArrayList called theLayers which stores collections of points (layers), and I would like each layer to have a distinct color. At each iteration of the for loop I set the graphics to a new color and draw the points of each distinct layer. However, upon debugging, I have noticed that the points are set to the last color that was generated.
I have tried placing the random color assignment at different locations in the code, and I have debugged the code to ensure that the colors are indeed being changed during each iteration.
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.util.ArrayList;
import javax.swing.JPanel;
public class Drawer extends JPanel
private ArrayList<ArrayList<Point>> theLayers;
public Drawer()
this(new ArrayList<ArrayList<Point>>());
public Drawer(ArrayList<ArrayList<Point>> coordinates)
this.theLayers = new ArrayList<ArrayList<Point>>(coordinates);
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<Point> coordinates:theLayers)
int R = (int) (Math.random( )*256);
int G = (int)(Math.random( )*256);
int B= (int)(Math.random( )*256);
Color randomColor = new Color(R, G, B);
g2d.setColor(randomColor);
for (int i = 0; i < coordinates.size(); i++)
g2d.drawLine(coordinates.get(i).x, coordinates.get(i).y,
coordinates.get(i).x, coordinates.get(i).y);
I want the color of each layer to be distinct, not the same color. Thank you.
java swing colors
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
add a comment |
I have an ArrayList called theLayers which stores collections of points (layers), and I would like each layer to have a distinct color. At each iteration of the for loop I set the graphics to a new color and draw the points of each distinct layer. However, upon debugging, I have noticed that the points are set to the last color that was generated.
I have tried placing the random color assignment at different locations in the code, and I have debugged the code to ensure that the colors are indeed being changed during each iteration.
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.util.ArrayList;
import javax.swing.JPanel;
public class Drawer extends JPanel
private ArrayList<ArrayList<Point>> theLayers;
public Drawer()
this(new ArrayList<ArrayList<Point>>());
public Drawer(ArrayList<ArrayList<Point>> coordinates)
this.theLayers = new ArrayList<ArrayList<Point>>(coordinates);
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<Point> coordinates:theLayers)
int R = (int) (Math.random( )*256);
int G = (int)(Math.random( )*256);
int B= (int)(Math.random( )*256);
Color randomColor = new Color(R, G, B);
g2d.setColor(randomColor);
for (int i = 0; i < coordinates.size(); i++)
g2d.drawLine(coordinates.get(i).x, coordinates.get(i).y,
coordinates.get(i).x, coordinates.get(i).y);
I want the color of each layer to be distinct, not the same color. Thank you.
java swing colors
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
1
1) For better help sooner, edit to add a minimal reproducible example or Short, Self Contained, Correct Example. 2) Use a logical and consistent form of indenting code lines and blocks. The indentation is intended to make the flow of the code easier to follow! Most IDEs have a keyboard shortcut specifically for formatting code.
– Andrew Thompson
Mar 26 at 2:50
1
You should NOT be generating random colors in the paintComponent() method. You can't control when Swing determines a components needs to be repainted. The color should be randomized and stored in the ArrayList as you add each object to the ArrayList. This means you need a custom object that contains the color and the object you want painted. Check out theDrawOnComponentexample from Custom Painting Approaches for a working example of this approach.
– camickr
Mar 26 at 2:55
@camickr I did as you said and created a custom object... but this did not resolve my issue.
– Hossmeister
Mar 26 at 3:26
@Hossmeister, 1) where is your minimal reproducible example demonstrating the problem? 2) How do you expect us to help if we can't see the code? 3) but more importantly you need to learn how to debug your own code, so how is your code different than the working example code you were given?
– camickr
Mar 26 at 14:38
add a comment |
I have an ArrayList called theLayers which stores collections of points (layers), and I would like each layer to have a distinct color. At each iteration of the for loop I set the graphics to a new color and draw the points of each distinct layer. However, upon debugging, I have noticed that the points are set to the last color that was generated.
I have tried placing the random color assignment at different locations in the code, and I have debugged the code to ensure that the colors are indeed being changed during each iteration.
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.util.ArrayList;
import javax.swing.JPanel;
public class Drawer extends JPanel
private ArrayList<ArrayList<Point>> theLayers;
public Drawer()
this(new ArrayList<ArrayList<Point>>());
public Drawer(ArrayList<ArrayList<Point>> coordinates)
this.theLayers = new ArrayList<ArrayList<Point>>(coordinates);
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<Point> coordinates:theLayers)
int R = (int) (Math.random( )*256);
int G = (int)(Math.random( )*256);
int B= (int)(Math.random( )*256);
Color randomColor = new Color(R, G, B);
g2d.setColor(randomColor);
for (int i = 0; i < coordinates.size(); i++)
g2d.drawLine(coordinates.get(i).x, coordinates.get(i).y,
coordinates.get(i).x, coordinates.get(i).y);
I want the color of each layer to be distinct, not the same color. Thank you.
java swing colors
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
I have an ArrayList called theLayers which stores collections of points (layers), and I would like each layer to have a distinct color. At each iteration of the for loop I set the graphics to a new color and draw the points of each distinct layer. However, upon debugging, I have noticed that the points are set to the last color that was generated.
I have tried placing the random color assignment at different locations in the code, and I have debugged the code to ensure that the colors are indeed being changed during each iteration.
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.util.ArrayList;
import javax.swing.JPanel;
public class Drawer extends JPanel
private ArrayList<ArrayList<Point>> theLayers;
public Drawer()
this(new ArrayList<ArrayList<Point>>());
public Drawer(ArrayList<ArrayList<Point>> coordinates)
this.theLayers = new ArrayList<ArrayList<Point>>(coordinates);
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<Point> coordinates:theLayers)
int R = (int) (Math.random( )*256);
int G = (int)(Math.random( )*256);
int B= (int)(Math.random( )*256);
Color randomColor = new Color(R, G, B);
g2d.setColor(randomColor);
for (int i = 0; i < coordinates.size(); i++)
g2d.drawLine(coordinates.get(i).x, coordinates.get(i).y,
coordinates.get(i).x, coordinates.get(i).y);
I want the color of each layer to be distinct, not the same color. Thank you.
java swing colors
java swing colors
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
asked Mar 26 at 2:37
HossmeisterHossmeister
1093 bronze badges
1093 bronze badges
1
1) For better help sooner, edit to add a minimal reproducible example or Short, Self Contained, Correct Example. 2) Use a logical and consistent form of indenting code lines and blocks. The indentation is intended to make the flow of the code easier to follow! Most IDEs have a keyboard shortcut specifically for formatting code.
– Andrew Thompson
Mar 26 at 2:50
1
You should NOT be generating random colors in the paintComponent() method. You can't control when Swing determines a components needs to be repainted. The color should be randomized and stored in the ArrayList as you add each object to the ArrayList. This means you need a custom object that contains the color and the object you want painted. Check out theDrawOnComponentexample from Custom Painting Approaches for a working example of this approach.
– camickr
Mar 26 at 2:55
@camickr I did as you said and created a custom object... but this did not resolve my issue.
– Hossmeister
Mar 26 at 3:26
@Hossmeister, 1) where is your minimal reproducible example demonstrating the problem? 2) How do you expect us to help if we can't see the code? 3) but more importantly you need to learn how to debug your own code, so how is your code different than the working example code you were given?
– camickr
Mar 26 at 14:38
add a comment |
1
1) For better help sooner, edit to add a minimal reproducible example or Short, Self Contained, Correct Example. 2) Use a logical and consistent form of indenting code lines and blocks. The indentation is intended to make the flow of the code easier to follow! Most IDEs have a keyboard shortcut specifically for formatting code.
– Andrew Thompson
Mar 26 at 2:50
1
You should NOT be generating random colors in the paintComponent() method. You can't control when Swing determines a components needs to be repainted. The color should be randomized and stored in the ArrayList as you add each object to the ArrayList. This means you need a custom object that contains the color and the object you want painted. Check out theDrawOnComponentexample from Custom Painting Approaches for a working example of this approach.
– camickr
Mar 26 at 2:55
@camickr I did as you said and created a custom object... but this did not resolve my issue.
– Hossmeister
Mar 26 at 3:26
@Hossmeister, 1) where is your minimal reproducible example demonstrating the problem? 2) How do you expect us to help if we can't see the code? 3) but more importantly you need to learn how to debug your own code, so how is your code different than the working example code you were given?
– camickr
Mar 26 at 14:38
1
1
1) For better help sooner, edit to add a minimal reproducible example or Short, Self Contained, Correct Example. 2) Use a logical and consistent form of indenting code lines and blocks. The indentation is intended to make the flow of the code easier to follow! Most IDEs have a keyboard shortcut specifically for formatting code.
– Andrew Thompson
Mar 26 at 2:50
1) For better help sooner, edit to add a minimal reproducible example or Short, Self Contained, Correct Example. 2) Use a logical and consistent form of indenting code lines and blocks. The indentation is intended to make the flow of the code easier to follow! Most IDEs have a keyboard shortcut specifically for formatting code.
– Andrew Thompson
Mar 26 at 2:50
1
1
You should NOT be generating random colors in the paintComponent() method. You can't control when Swing determines a components needs to be repainted. The color should be randomized and stored in the ArrayList as you add each object to the ArrayList. This means you need a custom object that contains the color and the object you want painted. Check out the
DrawOnComponent example from Custom Painting Approaches for a working example of this approach.– camickr
Mar 26 at 2:55
You should NOT be generating random colors in the paintComponent() method. You can't control when Swing determines a components needs to be repainted. The color should be randomized and stored in the ArrayList as you add each object to the ArrayList. This means you need a custom object that contains the color and the object you want painted. Check out the
DrawOnComponent example from Custom Painting Approaches for a working example of this approach.– camickr
Mar 26 at 2:55
@camickr I did as you said and created a custom object... but this did not resolve my issue.
– Hossmeister
Mar 26 at 3:26
@camickr I did as you said and created a custom object... but this did not resolve my issue.
– Hossmeister
Mar 26 at 3:26
@Hossmeister, 1) where is your minimal reproducible example demonstrating the problem? 2) How do you expect us to help if we can't see the code? 3) but more importantly you need to learn how to debug your own code, so how is your code different than the working example code you were given?
– camickr
Mar 26 at 14:38
@Hossmeister, 1) where is your minimal reproducible example demonstrating the problem? 2) How do you expect us to help if we can't see the code? 3) but more importantly you need to learn how to debug your own code, so how is your code different than the working example code you were given?
– camickr
Mar 26 at 14:38
add a comment |
1 Answer
1
active
oldest
votes
As explained by camickr have a custom point object that has color attribute:
class ColoredPoint extends Point
private final Color color;
ColoredPoint(int x, int y,Color color)
super(x, y);
this.color = color;
Color getColor()
return color;
And use it in Drawer class :
class Drawer extends JPanel
private final ArrayList<ArrayList<ColoredPoint>> theLayers;
private static final int W = 700, H =700;
public Drawer()
this(new ArrayList<ArrayList<ColoredPoint>>());
public Drawer(ArrayList<ArrayList<ColoredPoint>> coordinates)
theLayers = new ArrayList<>(coordinates);
setPreferredSize(new Dimension(W,H));
@Override
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<ColoredPoint> cPoints:theLayers)
g2d.setColor(cPoints.get(0).getColor());
for (int i = 0; i < cPoints.size(); i++)
g2d.drawLine(cPoints.get(i).x, cPoints.get(i).y,
cPoints.get(i).x, cPoints.get(i).y);
Use this link for an mcve. Copy paste the entire code into one file (SwingTestFrame.java) and run.
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
add a comment |
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As explained by camickr have a custom point object that has color attribute:
class ColoredPoint extends Point
private final Color color;
ColoredPoint(int x, int y,Color color)
super(x, y);
this.color = color;
Color getColor()
return color;
And use it in Drawer class :
class Drawer extends JPanel
private final ArrayList<ArrayList<ColoredPoint>> theLayers;
private static final int W = 700, H =700;
public Drawer()
this(new ArrayList<ArrayList<ColoredPoint>>());
public Drawer(ArrayList<ArrayList<ColoredPoint>> coordinates)
theLayers = new ArrayList<>(coordinates);
setPreferredSize(new Dimension(W,H));
@Override
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<ColoredPoint> cPoints:theLayers)
g2d.setColor(cPoints.get(0).getColor());
for (int i = 0; i < cPoints.size(); i++)
g2d.drawLine(cPoints.get(i).x, cPoints.get(i).y,
cPoints.get(i).x, cPoints.get(i).y);
Use this link for an mcve. Copy paste the entire code into one file (SwingTestFrame.java) and run.
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
add a comment |
As explained by camickr have a custom point object that has color attribute:
class ColoredPoint extends Point
private final Color color;
ColoredPoint(int x, int y,Color color)
super(x, y);
this.color = color;
Color getColor()
return color;
And use it in Drawer class :
class Drawer extends JPanel
private final ArrayList<ArrayList<ColoredPoint>> theLayers;
private static final int W = 700, H =700;
public Drawer()
this(new ArrayList<ArrayList<ColoredPoint>>());
public Drawer(ArrayList<ArrayList<ColoredPoint>> coordinates)
theLayers = new ArrayList<>(coordinates);
setPreferredSize(new Dimension(W,H));
@Override
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<ColoredPoint> cPoints:theLayers)
g2d.setColor(cPoints.get(0).getColor());
for (int i = 0; i < cPoints.size(); i++)
g2d.drawLine(cPoints.get(i).x, cPoints.get(i).y,
cPoints.get(i).x, cPoints.get(i).y);
Use this link for an mcve. Copy paste the entire code into one file (SwingTestFrame.java) and run.
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
add a comment |
As explained by camickr have a custom point object that has color attribute:
class ColoredPoint extends Point
private final Color color;
ColoredPoint(int x, int y,Color color)
super(x, y);
this.color = color;
Color getColor()
return color;
And use it in Drawer class :
class Drawer extends JPanel
private final ArrayList<ArrayList<ColoredPoint>> theLayers;
private static final int W = 700, H =700;
public Drawer()
this(new ArrayList<ArrayList<ColoredPoint>>());
public Drawer(ArrayList<ArrayList<ColoredPoint>> coordinates)
theLayers = new ArrayList<>(coordinates);
setPreferredSize(new Dimension(W,H));
@Override
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<ColoredPoint> cPoints:theLayers)
g2d.setColor(cPoints.get(0).getColor());
for (int i = 0; i < cPoints.size(); i++)
g2d.drawLine(cPoints.get(i).x, cPoints.get(i).y,
cPoints.get(i).x, cPoints.get(i).y);
Use this link for an mcve. Copy paste the entire code into one file (SwingTestFrame.java) and run.
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
As explained by camickr have a custom point object that has color attribute:
class ColoredPoint extends Point
private final Color color;
ColoredPoint(int x, int y,Color color)
super(x, y);
this.color = color;
Color getColor()
return color;
And use it in Drawer class :
class Drawer extends JPanel
private final ArrayList<ArrayList<ColoredPoint>> theLayers;
private static final int W = 700, H =700;
public Drawer()
this(new ArrayList<ArrayList<ColoredPoint>>());
public Drawer(ArrayList<ArrayList<ColoredPoint>> coordinates)
theLayers = new ArrayList<>(coordinates);
setPreferredSize(new Dimension(W,H));
@Override
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(new BasicStroke(3));
for(ArrayList<ColoredPoint> cPoints:theLayers)
g2d.setColor(cPoints.get(0).getColor());
for (int i = 0; i < cPoints.size(); i++)
g2d.drawLine(cPoints.get(i).x, cPoints.get(i).y,
cPoints.get(i).x, cPoints.get(i).y);
Use this link for an mcve. Copy paste the entire code into one file (SwingTestFrame.java) and run.
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
answered Mar 26 at 6:53
c0derc0der
10.4k5 gold badges19 silver badges48 bronze badges
10.4k5 gold badges19 silver badges48 bronze badges
add a comment |
add a comment |
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1
1) For better help sooner, edit to add a minimal reproducible example or Short, Self Contained, Correct Example. 2) Use a logical and consistent form of indenting code lines and blocks. The indentation is intended to make the flow of the code easier to follow! Most IDEs have a keyboard shortcut specifically for formatting code.
– Andrew Thompson
Mar 26 at 2:50
1
You should NOT be generating random colors in the paintComponent() method. You can't control when Swing determines a components needs to be repainted. The color should be randomized and stored in the ArrayList as you add each object to the ArrayList. This means you need a custom object that contains the color and the object you want painted. Check out the
DrawOnComponentexample from Custom Painting Approaches for a working example of this approach.– camickr
Mar 26 at 2:55
@camickr I did as you said and created a custom object... but this did not resolve my issue.
– Hossmeister
Mar 26 at 3:26
@Hossmeister, 1) where is your minimal reproducible example demonstrating the problem? 2) How do you expect us to help if we can't see the code? 3) but more importantly you need to learn how to debug your own code, so how is your code different than the working example code you were given?
– camickr
Mar 26 at 14:38