I created a JFrame. And when I draw a line with x=0, y=0 starting point in the x and y axis with Graphics2D.drawline(), it does not start from the x=0 axis of the JFrame. What should I do? enter image description here
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
public class MyGraphics extends JFrame{
MyGraphics(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(500,500);
this.setVisible(true);
}
public void paint(Graphics g){
Graphics2D g2D = (Graphics2D)g;
g2D.setPaint(Color.blue);
g2D.drawLine(0, 0, 500, 500);
g2D.setStroke(new BasicStroke(5));
}
}
It starts from (0,0) but it is covered by top bar of window frame.
To see this, put
this.setUndecorated(true);
as the first line in constructor. It will show a window without top bar.
Related
How do I get full smile face?
I am trying to draw a happy face with full mouth smile,
it is giving me results like a half moon.
How can I get result like the picture?
What code should I use ?
I tried to draw a curved line but im very beginner i could not find a way to fill it.
Here is my code:
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;
import javax.swing.*;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class Smiley extends JFrame {
// constructor sets window's title bar string and dimensions (full screen)
public Smiley (){
super( "Happy Face" );
setSize( 1660, 1080 );
setVisible( true );
}
public void paint( Graphics g ){
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(7));
// call superclass's paint method
super.paint( g );
g.setColor(Color.yellow);
g.fillOval(500, 200, 400, 400);
g.setColor(Color.white);
g.fillOval(520, 350, 100, 100);
g.fillOval(780, 350, 100, 100);
g2.setPaint(Color.black);
g.drawOval(500, 200, 400, 400);
g.fillArc( 100, 120, 80, 80,180 , 180 );
I tried to draw a curved line but i could not find a way to fill it.
Well you can't fill a single curved line.
I assume you mean you want to fill the white part of the mouth between the two curved lines.
You might be able to use a GeneralPath. It will allow you to combine multiple lines/curves into a single shape. Then you paint the shape and fill it.
So the basic code might be something like:
GeneralPath gp = new GeneralPath();
gp.moveTo(...); // starting point
gp.curveTo(...); // first curve
gp.moveTo(...); // reset back to starting point
gp.curveTo(...); // second curve
g2.setColor( Color.WHITE );
g2.fill( gp );
I have a graphics object and I want to color all the area except some rectangles. For e.g.
I want to color all area except these black areas. Can I do that? There can be many rectangles in the image.
I recommend you to fill all area with White color, and then draw Black rectangles on that, because it's simplier that draw figure with holes. For example like next:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class DrawExample extends JPanel{
List<Rectangle> rctangles = new ArrayList<>();
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DrawExample drawExample = new DrawExample();
drawExample.addRect(new Rectangle(20,20,25,25));
drawExample.addRect(new Rectangle(50,50,25,25));
frame.add(drawExample);
frame.setSize(200,200);
frame.setVisible(true);
}
private void addRect(Rectangle rectangle) {
rctangles.add(rectangle);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.WHITE);
g.fillRect(0, 0, getWidth(), getHeight());
g.setColor(Color.BLACK);
for(Rectangle r : rctangles){
g.fillRect(r.x, r.y, r.width,r.height);
}
}
}
Hello im trying to make a simple background split in half using a Jframe
How do i make the background move and adjust with my opened window.
import javax.swing.JFrame;
public class Concert
{
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setSize(1000, 800);
frame.setTitle("Concert!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Concertbackground component = new Concertbackground();
frame.add(component);
frame.setVisible(true);
}
}
Background: Ignore all the other imported things for now please.
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import javax.swing.JComponent;
import java.awt.GradientPaint;
/*
component that draws the concert background
*/
public class Concertbackground extends JComponent
{
public void paintComponent(Graphics g)
{
// Recover Graphics2D
Graphics2D g2 = (Graphics2D) g;
//Background Top
g2.setColor(Color.BLUE);
Rectangle backgroundTop = new Rectangle (0, 0, 1000, 400);
g2.fill(backgroundTop);
// Background bottom
g2.setColor(Color.GREEN);
Rectangle backgroundBottom = new Rectangle (0, 400, 1000, 800);
g2.fill(backgroundBottom);
}
}
First, beware, that by default JComponent is transparent (this is very important for the next part).
Second, you should be calling super.paintComponent to ensure that the graphics context you are about to paint to has being prepared properly...
Thirdly, you shouldn't be relying on magic numbers...
For example...
public class Concertbackground extends JComponent
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
// Recover Graphics2D
Graphics2D g2 = (Graphics2D) g;
//Background Top
g2.setColor(Color.BLUE);
Rectangle backgroundTop = new Rectangle (0, 0, getWidth(), getHeight() / 2);
g2.fill(backgroundTop);
// Background bottom
g2.setColor(Color.GREEN);
Rectangle backgroundBottom = new Rectangle (0, getHeight() / 2, getWidth(), getHeight() / 2);
g2.fill(backgroundBottom);
}
}
If your intention is to use the component as the background of the frame, you should consider using JFrame#setContentPane instead of adding it to the frame...
How do i make the background move and adjust with my opened window.
Don't hardcode values. Use:
int width = getWidth();
int height = getHeight();
Then you can paint the top part the full width and the height from 0 to height / 2.
And the bottom part would be the full width with the height from height /2 to height.
Also, don't forget to set a layout manager for this component so you can add other components to it. Typically the main panel of the frame would use a BorderLayout.
Write a program that fills the window with a larrge ellipse. The ellipse shoud touch the window boundaries, even if the window is resized.
I have the following code:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JComponent;
public class EllipseComponent extends JComponent {
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
Ellipse2D.Double ellipse = new Ellipse2D.Double(0,0,150,200);
g2.draw(ellipse);
g2.setColor(Color.red);
g2.fill(ellipse);
}
}
And the main class:
import javax.swing.JFrame;
public class EllipseViewer {
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setSize(150, 200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
EllipseComponent component = new EllipseComponent();
frame.add(component);
frame.setVisible(true);
}
}
in your EllipseComponent you do:
Ellipse2D.Double ellipse = new Ellipse2D.Double(0,0,getWidth(),getHeight());
I'd also recommend the changes given by Hovercraft Full Of Eels. In this simple case it might not be an issue but as the paintComponent method grows in complexity you realy want as little as possible to be computed in the paintComponent method.
Do not resize components within paintComponent. In fact, do not create objects or do any program logic within this method. The method needs to be lean, fast as possible, do drawing, and that's it. You must understand that you do not have complete control over when or even if this method is called, and you certainly don't want to add code to it unnecessarily that may slow it down.
You should create your ellipse in the class's constructor. To resize it according to the JComponent's size and on change of size, use a ComponentListener.:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JComponent;
public class EllipseComponent extends JComponent {
Ellipse2D ellipse = null;
public EllipseComponent {
ellipse = new Ellipse2D.Double(0,0,150,200);
addComponentListener(new ComponentAdapter() {
public void componentResized(ComponentEvent e) {
// set the size of your ellipse here
// based on the component's width and height
}
});
}
public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
g2.draw(ellipse);
g2.setColor(Color.red);
g2.fill(ellipse);
}
}
Caveat: code not run nor tested
Could any body diagnose the problem I am facing?
As you run the demo you can see the middle part left blank, I need to fill the entire area..
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class FillDemo
{
public static void main(String aths[])
{
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pnl = new PolygonDemo();
pnl.setSize(100, 200);
f.getContentPane().add(pnl);
f.setSize(400,280);
f.setLocation(200,200);
f.setVisible(true);
}
}
class PolygonDemo extends JPanel
{
public PolygonDemo()
{
setBackground(Color.white);
}
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
Polygon p=new Polygon();
p.addPoint(100,0);
p.addPoint(100,100);
p.addPoint(0,100);
p.addPoint(0,0);
p.addPoint(80,0);
p.addPoint(80,20);
p.addPoint(40,20);
p.addPoint(40,40);
p.addPoint(80,40);
p.addPoint(80,100);
p.addPoint(20,100);
p.addPoint(20,80);
p.addPoint(60,80);
p.addPoint(60,60);
p.addPoint(20,60);
p.addPoint(20,0);
p.addPoint(0,0);
g2.setColor(Color.BLACK);
g2.draw(p);
g2.setColor(new Color(120,250,100));
g2.fillPolygon(p);
//g2.fillPolygon(p.xpoints,p.ypoints,p.npoints);
}
}
Many thanks in advance
Your polygon intersects with itself. The fillPolygon method can not clearly decide which point is in and which is out. From the fillPolygon javadoc:
The area inside the polygon is defined using an even-odd fill rule, also known as the alternating rule.
Perhaps you can split your polygon into three single ones.
Draw Rectangle and Fill Color.....
public void paint(Graphics g)
{
int[] xPoints = {100,50,150};
int[] yPoints = {100,200,200};
g.setColor(Color.black);
g.drawPolygon(xPoints, yPoints, 3);
g.setColor(Color.red);
g.fillPolygon(xPoints, yPoints, 3);
}