Draw stars in java

Draw a star with GeneralPath in Java

The following code shows how to draw a star with GeneralPath.

Example

 import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.GeneralPath; import java.awt.geom.Point2D; /* ww w . j ava 2s . c o m*/ import javax.swing.JComponent; import javax.swing.JFrame; class MyCanvas extends JComponent < public void paint(Graphics g) < Graphics2D g2D = (Graphics2D) g; Point2D.Float point = new Point2D.Float(100, 100); // store start point GeneralPath p = new GeneralPath(GeneralPath.WIND_NON_ZERO); p.moveTo(point.x, point.y); p.lineTo(point.x + 20.0f, point.y - 5.0f); // Line from start to A point = (Point2D.Float)p.getCurrentPoint(); p.lineTo(point.x + 5.0f, point.y - 20.0f); // Line from A to B point = (Point2D.Float)p.getCurrentPoint(); p.lineTo(point.x + 5.0f, point.y + 20.0f); // Line from B to C point = (Point2D.Float)p.getCurrentPoint(); p.lineTo(point.x + 20.0f, point.y + 5.0f); // Line from C to D point = (Point2D.Float)p.getCurrentPoint(); p.lineTo(point.x - 20.0f, point.y + 5.0f); // Line from D to E point = (Point2D.Float)p.getCurrentPoint(); p.lineTo(point.x - 5.0f, point.y + 20.0f); // Line from E to F point = (Point2D.Float)p.getCurrentPoint(); p.lineTo(point.x - 5.0f, point.y - 20.0f); // Line from F to g p.closePath(); // Line from G to start g2D.draw(p); > > public class Main < public static void main(String[] a) < JFrame window = new JFrame(); window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); window.setBounds(30, 30, 450, 450); window.getContentPane().add(new MyCanvas()); window.setVisible(true); > > 

The code above generates the following result.

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Рисуем звезду на Java

Все умеют рисовать линии, прямоугольники и круги на Java – для этого есть стандартные методы drawLine, dravOval и так далее. А вот рисование более сложных геометрических фигур – уже задача поинтереснее. В этой заметке мы научимся рисовать на Java звезды разной сложности и с различным количеством лучей.

Нарисовать звезду на Java чаще всего предлагают с помощью класса Polygon, который присутствовал еще с Java 1.0, но вряд ли стоит использовать его в современном коде. Область применения его ограничена массивом целых чисел. Также, несмотря на то, что он реализует интерфейс Shape, есть более современные реализации этого интерфейса, которые могут быть использованы для представления многоугольников. В большинстве случаев, создавать многоугольник с помощью Path2D проще.

Общий алгоритм такой: создаем новый объект класса Path2D, а затем, с помощью методов MoveTo и LineTo генерируем многоугольник нужной формы.

В программе ниже показано, как класс Path2D может быть использован для создания различных типов звезд. Самым важным является метод drawStar. Этот метод очень общего характера. На вход он получает:

• координаты центра звезды;
• внутренний и внешний радиус звезды;
• количество лучей у звезды;
• угол поворота звезды.

package stars; /** * * @author upread.ru */ import java.awt.*; import javax.swing.*; import java.awt.geom.Path2D; public class Stars < public static void main(String[] args) < SwingUtilities.invokeLater(new Runnable() < @Override public void run() < drawingAndDisplay(); >>); > private static void drawingAndDisplay() < JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.getContentPane().add(new StarPanel()); f.setSize(600, 600); f.setLocationRelativeTo(null); f.setVisible(true); >> class StarPanel extends JPanel < @Override protected void paintComponent(Graphics gr) < super.paintComponent(gr); Graphics2D g = (Graphics2D) gr; g.setColor(Color.GRAY); g.fillRect(0, 0, getWidth(), getHeight()); g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); g.setColor(Color.BLACK); g.draw(createSimpleStar(50, 200, 200)); g.setPaint(Color.GREEN); g.fill(drawStar(400, 400, 40, 60, 10, 0)); g.setPaint(new RadialGradientPaint( new Point(400, 200), 60, new float[] < 0, 1 >, new Color[] < Color.RED, Color.YELLOW >)); g.fill(drawStar(400, 200, 20, 60, 8, 0)); g.setPaint(new RadialGradientPaint( new Point(200, 400), 50, new float[] < 0, 0.3f, 1 >, new Color[] < Color.BLACK, Color.YELLOW, Color.ORANGE >)); g.fill(drawStar(200, 400, 40, 50, 20, 0)); > private static Shape createSimpleStar(double radius, double koordX, double koordY) < return drawStar(koordX, koordY, radius, radius * 2.63, 5, Math.toRadians(-18)); >private static Shape drawStar(double koordX, double koordY, double innerRadius, double outerRadius, int numRays, double startAngleR) < Path2D p = new Path2D.Double(); double deltaAngleR = Math.PI / numRays; for (int i = 0; i < numRays * 2; i++) < double angleR = startAngleR + i * deltaAngleR; double ca = Math.cos(angleR); double sa = Math.sin(angleR); double relX = ca; double relY = sa; if ((i & 1) == 0) < relX *= outerRadius; relY *= outerRadius; >else < relX *= innerRadius; relY *= innerRadius; >if (i == 0) < p.moveTo(koordX + relX, koordY + relY); >else < p.lineTo(koordX + relX, koordY + relY); >> p.closePath(); return p; > >

Автор этого материала — я — Пахолков Юрий. Я оказываю услуги по написанию программ на языках Java, C++, C# (а также консультирую по ним) и созданию сайтов. Работаю с сайтами на CMS OpenCart, WordPress, ModX и самописными. Кроме этого, работаю напрямую с JavaScript, PHP, CSS, HTML — то есть могу доработать ваш сайт или помочь с веб-программированием. Пишите сюда.

заметки, java, рисование, звезда, геометрические фигуры

Бесплатный https и
домен RU в подарок

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Draw Star in Java Swing Example

Dinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.

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Draw Star in Java Swing Example

Dinesh Thakur holds an B.C.A, MCDBA, MCSD certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps.

Dinesh Thakur is a Freelance Writer who helps different clients from all over the globe. Dinesh has written over 500+ blogs, 30+ eBooks, and 10000+ Posts for all types of clients.

For any type of query or something that you think is missing, please feel free to Contact us.

Primary Sidebar

SQL Tutorials

SQL Tutorials

• SQL — Home
• SQL — Select
• SQL — Create
• SQL — View
• SQL — Sub Queries
• SQL — Update
• SQL — Delete
• SQL — Order By
• SQL — Select Distinct
• SQL — Group By
• SQL — Where Clause
• SQL — Select Into
• SQL — Insert Into
• SQL — Sequence
• SQL — Constraints
• SQL — Alter
• SQL — Date
• SQL — Foreign Key
• SQL — Like Operator
• SQL — CHECK Constraint
• SQL — Exists Operator
• SQL — Drop Table
• SQL — Alias Syntax
• SQL — Primary Key
• SQL — Not Null
• SQL — Union Operator
• SQL — Unique Constraint
• SQL — Between Operator
• SQL — Having Clause
• SQL — Isnull() Function
• SQL — IN Operator
• SQL — Default Constraint
• SQL — Minus Operator
• SQL — Intersect Operator
• SQL — Triggers
• SQL — Cursors

Advanced SQL

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• SQL — Index
• SQL — Self Join
• SQL — Outer Join
• SQL — Join Types
• SQL — Cross Join
• SQL — Left Outer Join
• SQL — Right Join
• SQL — Drop Index
• SQL — Inner Join
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• SQL — NVL Function
• SQL — Decode Function
• SQL — Datepart() Function
• SQL — Count Function
• SQL — Getdate() Function
• SQL — Cast() Function
• SQL — Round() Function

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• Computer Fundamental
• Computer Networking
• Operating System
• Database System
• Computer Graphics
• Management System
• Software Engineering
• Digital Electronics
• Electronic Commerce
• Compiler Design
• Troubleshooting

Programming

• Java Programming
• Structured Query (SQL)
• C Programming
• C++ Programming
• Visual Basic
• Data Structures
• Struts 2
• Java Servlet
• C# Programming
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• Interviews

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Draw stars in java

Here is a tutorial to make your way into drawing graphics with Java. This program creates a semi-circle line of stars. The stars are.

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Thursday, March 29, 2012

Draw stars using Java

Here is a tutorial to make your way into drawing graphics with Java. This program creates a semi-circle line of stars. The stars are randomly colored. I made the program using Netbeans 5.5, and I tested the code also with Sun Java Studio Enterprise 8.1. Both of them are free. The output is what you see above (star color may differ as they are randomly colored).

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.awt.geom.*;

class psy2k extends JFrame public psy2k()
super( «Psy2k star draw» );

Graphics2D g2d = ( Graphics2D ) g;

GeneralPath star = new GeneralPath();
star.moveTo( xPoints[ 0 ], yPoints[ 0 ] );

for ( int k = 1; k < xPoints.length; k++ ) star.lineTo( xPoints[ k ], yPoints[ k ] ); star.closePath();
g2d.translate( 200, 200 );
for ( int j = 1; j g2d.rotate( Math.PI / 20.0 );
g2d.setColor( new Color( ( int ) ( Math.random() * 256 ),
( int ) ( Math.random() * 256 ),
( int ) ( Math.random() * 256 ) ) );
g2d.fill( star );
>
>
public static void main( String args[] )
<
psy2k app = new psy2k();
app.addWindowListener( new WindowAdapter()
<
public void windowClosing( WindowEvent e )
<
System.exit( 0 );
>
>
);
>
>

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    Lulzim Miftari I’m Joanna and this blog is All About Me. 🙂 I’m a 30-something Polish girl living in Belgium. I have a pretty regular job that I like, a beautiful house in the suburbs, a wonderful partner and a lovely son born in January 2010. I’m a very lucky girl. I have always loved to read and was looking for book blogs when I discovered that the book blogging universe was a whole community that cares about its members and considers them friends. I wanted to belong too and so started blogging in January 2008. I haven’t looked back since — although like everyone I have ups and downs and sometimes life is simply too busy for me to be able to blog, I always come back to the wonderful people who I now consider friends. Most of the content of my blog is book-related, but I also include recipes and other kitchen notes, since I like to cook and try to make time for it. I imagine that my son comes up a lot too. 😉 You’re always welcome to contact me if you wish — email me on joanna dot loves dot books at gmail dot com View my complete profile

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