Graficos Y Java 2D 1 2 3 4 5 6 7 8 9 Introducción Contextos y objetos gráficos Colores Fuentes Pintar Líneas, Rectángulos y Óvalos Pintar Arcos Pintar Polígonos and Polilíneas Java2D API Ejemplo 1 Introducción Capacidades gráficas de JAVA − − − Pintar figuras de 2D Uso y control colores Uso y control de fuentes Java 2D API − Uso más sofisticado de primitivas de dibujo en 2D Uso de formar y polígonos 2D personalizados Relleno de figuras con colores, gradientes, patrones y texturas. Jerarquía de algunas clases e interfaces del Java2D API. Object Color Component Font FontMetrics Graphics Polygon Clases e interfaces del Java2D API que aparecen en el paquete java.awt Graphics2D interface java.awt.Paint BasicStroke GradientPaint TexturePaint interface java.awt.Shape interface java.awt.Stroke Clases e interfaces del Java2D API que aparecen en el paquete java.awt.geom GeneralPath Line2D RectangularShape Arc2D Ellipse2D Rectangle2D RoundRectangle2D 1 Introducción Sistema de coordenadas de JAVA − − − Identifica todos los puntos disponibles de la pantallas Origen de coordenadas (0,0) en la esquina superior izquierda Sistema de coordenadas compuestas por componentes X e Y. Sistema de coordenadas de Java. Unidad de medida en pixels. +x (0, 0) (x , y ) +y Y a xis X a xis 2 Contextos y objetos gráficos Contexto Graphics Permite pintar en la pantalla. – El objeto Graphics controla el contexto de graficos − − Controla como se pinta en la pantalla La Clase Graphics es abstracta No se puede instanciar Contribuye a la portabilidad de Java − La el método paint de la lase Component emplea el objeto Graphics public void paint( Graphics g ) − Se puede invocar por medio del método repaint 3 Colores Clase Color − − Define los métodos y las constantes para manipular los colores. Los colores se crean en base al esquema de rojo/verde/azul (RGB). Constantes de colores definidas en la clase Color Color constant public final static Color ORANGE Color RGB value public final static Color PINK orange pink 255, 200, 0 255, 175, 175 public final static Color CYAN cyan 0, 255, 255 public final static Color MAGENTA magenta 255, 0, 255 public final static Color YELLOW yellow 255, 255, 0 public final static Color BLACK black 0, 0, 0 public final static Color WHITE white 255, 255, 255 public final static Color GRAY gray 128, 128, 128 public final static Color LIGHT_GRAY light gray 192, 192, 192 public final static Color DARK_GRAY dark gray 64, 64, 64 public final static Color RED red 255, 0, 0 public final static Color GREEN green 0, 255, 0 public final static Color BLUE blue 0, 0, 255 Métodos de la clase Color y métodos de relacionados de la clase Graphics Method Description Color constructors and methods public Color( int r, int g, int b ) Creates a color based on red, green and blue components expressed as integers from 0 to 255. public Color( float r, float g, float b ) Creates a color based on red, green and blue components expressed as floatingpoint values from 0.0 to 1.0. public int getRed() Returns a value between 0 and 255 representing the red content. public int getGreen() Returns a value between 0 and 255 representing the green content. public int getBlue() Returns a value between 0 and 255 representing the blue content. Graphics methods for manipulating Colors public Color getColor() Returns a Color object representing the current color for the graphics context. public void setColor( Color c ) Sets the current color for drawing with the graphics context. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 // Fig. 12.5: ShowColors.java // Demonstrating Colors. import java.awt.*; import javax.swing.*; public class ShowColors extends JFrame { // constructor sets window's title bar string and dimensions public ShowColors() { Pinta la ventana cuando super( "Using colors" ); setSize( 400, 130 ); setVisible( true ); } comienza la ejecución de la aplicación El método setColor establece el color de pintura en base a un color RGB // draw rectangles and Strings in different colors public void paint( Graphics g ) { // call superclass's paint method El método fillRect crea un super.paint( g ); rectángulo relleno en el color de pintura actual. // set new drawing color using integers g.setColor( new Color( 255, 0, 0 ) ); g.fillRect( 25, 25, 100, 20 ); g.drawString( "Current RGB: " + g.getColor(), 130, 40 ); El método drawString escribe un String en el color actual en las coordenadas especificadas 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 // set new drawing color using floats g.setColor( new Color( 0.0f, 1.0f, 0.0f ) ); g.fillRect( 25, 50, 100, 20 ); g.drawString( "Current RGB: " + g.getColor(), 130, 65 ); // set new drawing color using static Color objects g.setColor( Color.BLUE ); g.fillRect( 25, 75, 100, 20 ); g.drawString( "Current RGB: " + g.getColor(), 130, 90 ); Empleamos las constantes de la clase Color // display individual RGB values Color color = Color.MAGENTA; g.setColor( color ); g.fillRect( 25, 100, 100, 20 ); g.drawString( "RGB values: " + color.getRed() + ", " + color.getGreen() + ", " + color.getBlue(), 130, 115 ); } // end method paint // execute application public static void main( String args[] ) { ShowColors application = new ShowColors(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } } // end class ShowColors 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 // Fig. 12.6: ShowColors2.java // Choosing colors with JColorChooser. import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ShowColors2 extends JFrame { private JButton changeColorButton; private Color color = Color.LIGHT_GRAY; private Container container; // set up GUI public ShowColors2() { super( "Using JColorChooser" ); container = getContentPane(); container.setLayout( new FlowLayout() ); // set up changeColorButton and register its event handler changeColorButton = new JButton( "Change Color" ); changeColorButton.addActionListener( 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 new ActionListener() { // anonymous inner class // display JColorChooser when user clicks button JColorChooser presenta public void actionPerformed( ActionEvent event ) un diálogo para { seleccionar colores color = JColorChooser.showDialog( ShowColors2.this, "Choose a color", color ); // set default color, if no color is returned if ( color == null ) color = Color.LIGHT_GRAY; // change content pane's background color container.setBackground( color ); } } // end anonymous inner class ); // end call to addActionListener container.add( changeColorButton ); setSize( 400, 130 ); setVisible( true ); } // end ShowColor2 constructor static showDialog muestra el cuadro de diálogo 51 52 53 54 55 56 57 58 // execute application public static void main( String args[] ) { ShowColors2 application = new ShowColors2(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } } // end class ShowColors2 ShowColors2.java Fig. 12.7 HSB and RGB tabs of the JColorChooser dialog 4 Fuente Clase Font − − Contiene métodos y constantes para el control de las fuentes. El constructor de la clase Font tiene tres argumentos Font name – Monospaced, SansSerif, Serif, etc. Font style – Font.PLAIN, Font.ITALIC y Font.BOLD Font size − Medido en puntos Métodos y constantes relacionados con la clase Font Method or constant Description Font constants, constructors and methods for drawing polygons public final static int PLAIN A constant representing a plain font style. public final static int BOLD A constant representing a bold font style. public final static int ITALIC A constant representing an italic font style. public Font( String name, int style, int size ) Creates a Font object with the specified font, style and size. public int getStyle() public int getSize() Returns an integer value indicating the current font style. Returns an integer value indicating the current font size. public String getName() Returns the current font name as a string. public String getFamily() Returns the font’s family name as a string. public boolean isPlain() public boolean isBold() public boolean isItalic() Tests a font for a plain font style. Returns Tests a font for a bold font style. Returns Tests a font for an italic font style. Returns true if the font is plain. true if the font is bold. true if the font is italic. Method or constant Description Graphics methods for manipulating Fonts public Font getFont() Returns a Font object reference representing the current font. public void setFont( Font f ) Sets the current font to the font, style and size specified by the object reference f. Font 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 // Fig. 12.9: Fonts.java // Using fonts. import java.awt.*; import javax.swing.*; public class Fonts extends JFrame { // set window's title bar and dimensions public Fonts() { super( "Using fonts" ); setSize( 420, 125 ); setVisible( true ); } // display Strings in different fonts and colors public void paint( Graphics g ) El método setFont { // call superclass's paint method super.paint( g ); establece la fuente a usar // set font to Serif (Times), bold, 12pt and draw a string g.setFont( new Font( "Serif", Font.BOLD, 12 ) ); g.drawString( "Serif 12 point bold.", 20, 50 ); Escribe el texto con la configuración actual de fuente 26 27 // set font to Monospaced (Courier), italic, 24pt and draw a string 28 29 30 31 g.setFont( new Font( "Monospaced", Font.ITALIC, 24 ) ); g.drawString( "Monospaced 24 point italic.", 20, 70 ); // set font to SansSerif (Helvetica), plain, 14pt and draw a string 32 33 34 35 g.setFont( new Font( "SansSerif", Font.PLAIN, 14 ) ); g.drawString( "SansSerif 14 point plain.", 20, 90 ); // set font to Serif (Times), bold/italic, 18pt and draw a string 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 g.setColor( Color.RED ); g.setFont( new Font( "Serif", Font.BOLD + Font.ITALIC, 18 ) ); g.drawString( g.getFont().getName() + " " + g.getFont().getSize() + " point bold italic.", 20, 110 ); } // end method paint // execute application public static void main( String args[] ) { Fonts application = new Fonts(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } } // end class Fonts Control de fuentes Parámetros de medida y posición de las Fuentes − − − − Height - Altura Descent (puntos por debajo de la linea base) Ascent (puntos por encima de la linea base) Leading (diferencia entre Ascent y Descent) Control y medidas he ight Xy1Õ le ading asce nt ba seline descent Fig. 12.11 FontMetrics and Graphics methods for obtaining font metrics Method Description FontMetrics methods public int getAscent() Returns a value representing the ascent of a font in points. public int getDescent() Returns a value representing the descent of a font in points. public int getLeading() Returns a value representing the leading of a font in points. public int getHeight() Returns a value representing the height of a font in points. Graphics methods for getting a Font’s FontMetrics public FontMetrics getFontMetrics() Returns the FontMetrics object for the current drawing Font. public FontMetrics getFontMetrics( Font f ) Returns the FontMetrics object for the specified Font argument. 1 // Fig. 12.12: Metrics.java 2 // FontMetrics and Graphics Metrics.java methods useful for obtaining font Line 22 Line 23 metrics. 3 import java.awt.*; 4 import javax.swing.*; 5 Set font to SansSerif 12-point bold 6 public class Metrics extends Obtain FontMetrics JFrame { object for current font 7 8 // set window's title bar String and dimensions 9 public Metrics() 25 Use FontMetrics to obtain ascent, descent, height and leading Metrics.java g.drawString( "Ascent: " + metrics.getAscent(), 10, 55 ); Repeat same process for Lines 25-28 26 g.drawString( "Descent:Serif " 14-point italic font + metrics.getDescent(), 10, 70 ); Lines 30-37 27 g.drawString( "Height: " + metrics.getHeight(), 10, 85 ); 28 g.drawString( "Leading: " + metrics.getLeading(), 10, 100 ); 29 30 Font font = new Font( "Serif", Font.ITALIC, 14 ); 31 metrics = g.getFontMetrics( font ); Metrics.java 5 Pintar Líneas, Rectángulos y Óvalos Clase Graphics − Provee métodos para pintar líneas, rectángulos y óvalos Todos lo métodos de pintar estas figuras requieren el ancho y alto que ocuparan Existen los métodos para pintar figuras con o sin rellene (draw* y fill*) Métodos de la clase Graphics para pintar líneas, rectángulos y óvalos Method Description public void drawLine( int x1, int y1, int x2, int y2 ) Draws a line between the point (x1, y1) and the point (x2, y2). public void drawRect( int x, int y, int width, int height ) Draws a rectangle of the specified width and height. The top-left corner of the rectangle has the coordinates (x, y). public void fillRect( int x, int y, int width, int height ) Draws a solid rectangle with the specified width and height. The top-left corner of the rectangle has the coordinate (x, y). public void clearRect( int x, int y, int width, int height ) Draws a solid rectangle with the specified width and height in the current background color. The top-left corner of the rectangle has the coordinate ( x, y). public void drawRoundRect( int x, int y, int width, int height, int arcWidth, int arcHeight ) Draws a rectangle with rounded corners in the current color with the specified width and height. The arcWidth and arcHeight determine the rounding of the corners (see Fig. 12.15). public void fillRoundRect( int x, int y, int width, int height, int arcWidth, int arcHeight ) Draws a solid rectangle with rounded corners in the current color with the specified width and height. The arcWidth and arcHeight determine the rounding of the corners (see Fig. 12.15). Métodos de la clase Graphics para pintar líneas, rectángulos y óvalos Method Description public void draw3DRect( int x, int y, int width, int height, boolean b ) Draws a three-dimensional rectangle in the current color with the specified width and height. The top-left corner of the rectangle has the coordinates ( x, y). The rectangle appears raised when b is true and lowered when b is false. public void fill3DRect( int x, int y, int width, int height, boolean b ) Draws a filled three-dimensional rectangle in the current color with the specified width and height. The top-left corner of the rectangle has the coordinates ( x, y). The rectangle appears raised when b is true and lowered when b is false. public void drawOval( int x, int y, int width, int height ) Draws an oval in the current color with the specified width and height. The bounding rectangle’s top-left corner is at the coordinates ( x, y). The oval touches all four sides of the bounding rectangle at the center of each side (see Fig. 12.16). public void fillOval( int x, int y, int width, int height ) Draws a filled oval in the current color with the specified width and height. The bounding rectangle’s top-left corner is at the coordinates ( x, y). The oval touches all four sides of the bounding rectangle at the center of each side (see Fig. 12.16). 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 // Fig. 12.14: LinesRectsOvals.java // Drawing lines, rectangles and ovals. import java.awt.*; import javax.swing.*; public class LinesRectsOvals extends JFrame { // set window's title bar String and dimensions public LinesRectsOvals() { super( "Drawing lines, rectangles and ovals" ); setSize( 400, 165 ); setVisible( true ); } // display various lines, rectangles and ovals public void paint( Graphics g ) { super.paint( g ); // call superclass's paint method g.setColor( Color.RED ); g.drawLine( 5, 30, 350, 30 ); g.setColor( Color.BLUE ); g.drawRect( 5, 40, 90, 55 ); g.fillRect( 100, 40, 90, 55 ); 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 g.setColor( Color.CYAN ); g.fillRoundRect( 195, 40, 90, 55, 50, 50 ); g.drawRoundRect( 290, 40, 90, 55, 20, 20 ); Draw filled rounded rectangle Draw (non-filled) rounded rectangle g.setColor( Color.YELLOW ); g.draw3DRect( 5, 100, 90, 55, true ); g.fill3DRect( 100, 100, 90, 55, false ); g.setColor( Color.MAGENTA ); g.drawOval( 195, 100, 90, 55 ); g.fillOval( 290, 100, 90, 55 ); Draw 3D rectangle Draw filled 3D rectangle Draw oval Draw filled oval } // end method paint // execute application public static void main( String args[] ) { LinesRectsOvals application = new LinesRectsOvals(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } } // end class LinesRectsOvals Altura y anchura del arco necesario para construir RoundedRectangle (x, y) arc height a rc width width height Medidas para construir un óvalo en base al rectángulo que lo contiene (x , y) height width 6 Pintar Arcos Arco − − − − Porción de un óvalo Se miden en grados Barre (Sweeps) el número de grados que indique el ángulo de arco Sweep empieza en el inicio de medida de los ángulos Barre en sentido contrario a las agujas del reloj si el ángulo es positivo Barre en sentido de las agujas del reloj para ángulos negativos. Ángulos positivos y negativos Positive angles Negative angles 90° 180° 90° 0° 270° 180° 0° 270° Métodos de la clase Graphics para el pintado de arcos Method Description public void drawArc( int x, int y, int width, int height, int startAngle, int arcAngle ) Draws an arc relative to the bounding rectangle’s top-left coordinates (x, y) with the specified width and height. The arc segment is drawn starting at startAngle and sweeps arcAngle degrees. public void fillArc( int x, int y, int width, int height, int startAngle, int arcAngle ) Draws a solid arc (i.e., a sector) relative to the bounding rectangle’s top-left coordinates (x, y) with the specified width and height. The arc segment is drawn starting at startAngle and sweeps arcAngle degrees. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 // Fig. 12.19: DrawArcs.java // Drawing arcs. import java.awt.*; import javax.swing.*; DrawArcs.java Lines 24-26 public class DrawArcs extends JFrame { // set window's title bar String and dimensions public DrawArcs() { super( "Drawing Arcs" ); setSize( 300, 170 ); setVisible( true ); } // draw rectangles and arcs public void paint( Graphics g ) { super.paint( g ); // call superclass's paint method // start at 0 and sweep 360 degrees g.setColor( Color.YELLOW ); g.drawRect( 15, 35, 80, 80 ); g.setColor( Color.BLACK ); g.drawArc( 15, 35, 80, 80, 0, 360 ); Draw first arc that sweeps 360 degrees and is contained in rectangle 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 // start at 0 and sweep 110 degrees g.setColor( Color.YELLOW ); g.drawRect( 100, 35, 80, 80 ); g.setColor( Color.BLACK ); g.drawArc( 100, 35, 80, 80, 0, 110 ); // start at 0 and sweep -270 degrees g.setColor( Color.YELLOW ); g.drawRect( 185, 35, 80, 80 ); g.setColor( Color.BLACK ); g.drawArc( 185, 35, 80, 80, 0, -270 ); // start at 0 and sweep 360 degrees g.fillArc( 15, 120, 80, 40, 0, 360 ); Draw second arc that sweeps 110 degrees and is contained in rectangle Draw third arc that sweeps -270 degrees and is contained in rectangle Draw fourth arc that is filled, has starting angle 0 and sweeps 360 degrees // start at 270 and sweep -90 degrees g.fillArc( 100, 120, 80, 40, 270, -90 ); Draw fifth arc that is filled, has starting angle 270 and sweeps -90 degrees // start at 0 and sweep -270 degrees g.fillArc( 185, 120, 80, 40, 0, -270 ); Draw sixth arc that is filled, has starting angle 0 and sweeps -270 degrees } // end method paint 51 52 53 54 55 56 57 58 // execute application public static void main( String args[] ) { DrawArcs application = new DrawArcs(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } } // end class DrawArcs 7 Pintar Polígonos y Polilíneas Clases Polygon − Polígonos − Figuras de varios lados Polilíneas Series de puntos conectados Métodos Graphics para pintar poligonos y métodos de la clase Polygon Method Description Graphics methods for drawing polygons public void drawPolygon( int xPoints[], int yPoints[], int points ) Draws a polygon. The x-coordinate of each point is specified in the xPoints array and the y-coordinate of each point is specified in the yPoints array. The last argument specifies the number of points . This method draws a closed polygon. If the last point is different from the first point, the polygon is closed by a line that connects the last point to the first point. public void drawPolyline( int xPoints[], int yPoints[], int points ) Draws a sequence of connected lines. The x-coordinate of each point is specified in the xPoints array and the y-coordinate of each point is specified in the yPoints array. The last argument specifies the number of points. If the last point is different from the first point, the polyline is not closed. public void drawPolygon( Polygon p ) Draws the specified polygon. public void fillPolygon( int xPoints[], int yPoints[], int points ) Draws a solid polygon. The x-coordinate of each point is specified in the xPoints array and the y-coordinate of each point is specified in the yPoints array. The last argument specifies the number of points. This method draws a closed polygon. If the last point is different from the first point, the polygon is closed by a line that connects the last point to the first point. public void fillPolygon( Polygon p ) Draws the specified solid polygon. The polygon is closed. Métodos Graphics para pintar poligonos y métodos de la clase Polygon Method Description Polygon constructors and methods public Polygon() Constructs a new polygon object. The polygon does not contain any points. public Polygon( int xValues[], int yValues[], int numberOfPoints ) Constructs a new polygon object. The polygon has with each point consisting of an x-coordinate from from yValues . public void addPoint( numberOfPoints sides, xValues and a y-coordinate int x, int y ) Adds pairs of x- and y-coordinates to the Polygon . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 // Fig. 12.21: DrawPolygons.java // Drawing polygons. import java.awt.*; import javax.swing.*; public class DrawPolygons extends JFrame { // set window's title bar String and dimensions public DrawPolygons() { super( "Drawing Polygons" ); setSize( 275, 230 ); setVisible( true ); } // draw polygons and polylines public void paint( Graphics g ) { super.paint( g ); // call superclass's paint method int xValues[] = { 20, 40, 50, 30, 20, 15 }; int yValues[] = { 50, 50, 60, 80, 80, 60 }; Polygon polygon1 = new Polygon( xValues, yValues, 6 ); g.drawPolygon( polygon1 ); int arrays specifying Polygon polygon1 points Draw polygon1 to screen 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 int xValues2[] = { 70, 90, 100, 80, 70, 65, 60 }; int yValues2[] = { 100, 100, 110, 110, 130, 110, 90 }; int arrays specifying Polyline points g.drawPolyline( xValues2, yValues2, 7 ); int xValues3[] = { 120, 140, 150, 190 }; int yValues3[] = { 40, 70, 80, 60 }; Draw Polyline to screen g.fillPolygon( xValues3, yValues3, 4 ); Specify points and draw (filled) Polygon to screen Polygon polygon2 = new Polygon(); polygon2.addPoint( 165, 135 ); polygon2.addPoint( 175, 150 ); polygon2.addPoint( 270, 200 ); polygon2.addPoint( 200, 220 ); polygon2.addPoint( 130, 180 ); Method addPoint adds pairs of x-y coordinates to a Polygon g.fillPolygon( polygon2 ); } // end method paint // execute application public static void main( String args[] ) { DrawPolygons application = new DrawPolygons(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } } // end class DrawPolygons 8 Java2D API Java 2D API − • • • • • • • Proporciona capacidades gráficas avanzas 2D java.awt java.awt.image java.awt.color java.awt.font java.awt.geom java.awt.print java.awt.image.renderable − Usa la clase java.awt.Graphics2D Extiende la clase java.awt.Graphics 12.8 Java2D API Java 2D formas − Paquetes java.awt.geom • Ellipse2D.Double • Rectangle2D.Double • RoundRectangle2D.Double • Arc3D.Double • Lines2D.Double 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 // Fig. 12.22: Shapes.java // Demonstrating some Java2D shapes. import java.awt.*; import java.awt.geom.*; import java.awt.image.*; import javax.swing.*; public class Shapes extends JFrame { // set window's title bar String and dimensions public Shapes() { super( "Drawing 2D shapes" ); setSize( 425, 160 ); setVisible( true ); } // draw shapes with Java2D API public void paint( Graphics g ) { super.paint( g ); // call superclass's paint method Graphics2D g2d = ( Graphics2D ) g; // cast g to Graphics2D Shapes.java 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 // draw 2D ellipse filled with a blue-yellow gradient g2d.setPaint( new GradientPaint( 5, 30, Color.BLUE, 35, 100, Color.YELLOW, true ) ); g2d.fill( new Ellipse2D.Double( 5, 30, 65, 100 ) ); // draw 2D rectangle in red g2d.setPaint( Color.RED ); g2d.setStroke( new BasicStroke( 10.0f ) ); g2d.draw( new Rectangle2D.Double( 80, 30, 65, 100 ) ); // draw 2D rounded rectangle with a buffered background BufferedImage buffImage = new BufferedImage( 10, 10, BufferedImage.TYPE_INT_RGB ); Graphics2D gg = buffImage.createGraphics(); gg.setColor( Color.YELLOW ); // draw in yellow gg.fillRect( 0, 0, 10, 10 ); // draw a filled rectangle gg.setColor( Color.BLACK ); // draw in black gg.drawRect( 1, 1, 6, 6 ); // draw a rectangle gg.setColor( Color.BLUE ); // draw in blue gg.fillRect( 1, 1, 3, 3 ); // draw a filled rectangle gg.setColor( Color.RED ); // draw in red gg.fillRect( 4, 4, 3, 3 ); // draw a filled rectangle Use GradientPaint to fill shape with gradient Fill ellipse with gradient Use BasicStroke to draw 2D red-border rectangle BufferedImage produces image to be manipulated Draw texture into BufferedImage 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 // paint buffImage onto the JFrame g2d.setPaint( new TexturePaint( buffImage, new Rectangle( 10, 10 ) ) ); g2d.fill( new RoundRectangle2D.Double( 155, 30, 75, 100, 50, 50 ) ); // draw 2D pie-shaped arc in white g2d.setPaint( Color.WHITE ); g2d.setStroke( new BasicStroke( 6.0f ) ); g2d.draw( new Arc2D.Double( 240, 30, 75, 100, 0, 270, Arc2D.PIE ) ); // draw 2D lines in green and yellow g2d.setPaint( Color.GREEN ); g2d.draw( new Line2D.Double( 395, 30, 320, 150 ) ); Use BufferedImage as texture for painting rounded rectangle Use Arc2D.PIE to draw white-border 2D pie-shaped arc Draw solid green line float dashes[] = { 10 }; g2d.setPaint( Color.YELLOW ); g2d.setStroke( new BasicStroke( 4, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 10, dashes, 0 ) ); g2d.draw( new Line2D.Double( 320, 30, 395, 150 ) ); } // end method paint Draw dashed yellow line that crosses solid green line 73 74 75 76 77 78 79 80 // execute application public static void main( String args[] ) { Shapes application = new Shapes(); application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); } } // end class Shapes Shapes.java 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 // Fig. 12.23: Shapes2.java // Demonstrating a general path. import java.awt.*; import java.awt.geom.*; import javax.swing.*; public class Shapes2 extends JFrame { // set window's title bar String, background color and dimensions public Shapes2() { super( "Drawing 2D Shapes" ); getContentPane().setBackground( Color.WHITE ); setSize( 400, 400 ); setVisible( true ); } // draw general paths public void paint( Graphics g ) { super.paint( g ); // call superclass's paint method int xPoints[] = { 55, 67, 109, 73, 83, 55, 27, 37, 1, 43 }; int yPoints[] = { 0, 36, 36, 54, 96, 72, 96, 54, 36, 36 }; x-y coordinates that comprise star 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 Graphics2D g2d = ( Graphics2D ) g; GeneralPath star = new GeneralPath(); // create GeneralPath object // set the initial coordinate of the General Path star.moveTo( xPoints[ 0 ], yPoints[ 0 ] ); // create the star--this does not draw the star for ( int count = 1; count < xPoints.length; count++ ) star.lineTo( xPoints[ count ], yPoints[ count ] ); star.closePath(); // close the shape GeneralPath is a shape constructed from straight lines and complex curves Shapes2.java Line 28 Create star Lines 31-37 Lines 42-50 g2d.translate( 200, 200 ); // translate the origin to (200, 200) // rotate around origin and draw stars in random colors for ( int count = 1; count <= 20; count++ ) { g2d.rotate( Math.PI / 10.0 ); // rotate coordinate system // set random drawing color g2d.setColor( new Color( ( int ) ( Math.random() * 256 ), ( int ) ( Math.random() * 256 ), ( int ) ( Math.random() * 256 ) ) ); g2d.fill( star ); // draw filled star } Draw filled, randomly colored star 20 times around origin Shapes2.java