Presentation is loading. Please wait.

Presentation is loading. Please wait.

© Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Chapter 28 - Java Graphics and Java2D Outline 28.1Introduction.

Published byHilary Hoover Modified over 8 years ago

Similar presentations

Presentation on theme: "© Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Chapter 28 - Java Graphics and Java2D Outline 28.1Introduction."— Presentation transcript:

1 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Chapter 28 - Java Graphics and Java2D Outline 28.1Introduction 28.2Graphics Contexts and Graphics Objects 28.3Color Control 28.4Font Control 28.5Drawing Lines, Rectangles and Ovals 28.6Drawing Arcs 28.7Drawing Polygons and Polylines 28.8The Java2D API 28.9Java2D Shapes

2 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Objectives In this chapter, you will learn: –To understand graphics contexts and graphics objects. –To understand and be able to manipulate colors. –To understand and be able to manipulate fonts. –To understand and be able to use Graphics methods for drawing lines, rectangles, rectangles with rounded corners, three-dimensional rectangles, ovals, arcs and polygons. –To use methods of class Graphics2D from the Java2D API to draw lines, rectangles, rectangles with rounded corners, ellipses, arcs and general paths. –To be able to specify Paint and Stroke characteristics of shapes displayed with Graphics2D.

3 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.1Introduction In this chapter –Draw 2D shapes –Colors –Fonts Java appealing for its graphics support –Has a class hierarchy for its graphics classes and 2D API classes

4 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.1Introduction

5 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.1Introduction Java coordinate system –(x,y) pairs x - horizontal axis y - vertical axis –Upper left corner is ( 0, 0 ) –Coordinates measured in pixels (smallest unit of resolution)

6 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.1Introduction

7 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.2Graphics Contexts and Graphics Objects Graphics context –Enables drawing on screen –Graphics object manages graphics context Controls how information is drawn Has methods for drawing, font manipulation, etc We have used Graphics object g for applets –Graphics an abstract class Cannot instantiate objects Implementation hidden - more portable Class Component –Superclass for many classes in java.awt –Method paint takes Graphics object as argument

8 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.2Graphics Contexts and Graphics Objects Class Component –paint called automatically when applet starts –paint often called in response to an event Drawing graphics is an event-driven process. –repaint calls update, which forces a paint operation update rarely called directly Sometimes overridden to reduce "flicker" Headers: public void repaint() public void update( Graphics g ) In this chapter –Focus on paint method

9 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.3Color Control Class Color –Defines methods and constants for manipulating colors –Colors created from red, green, and blue component RGB value: 3 integers from 0 to 255 each, or three floating point values from 0 to 1.0 each Larger the value, more of that color –Color methods getRed, getGreen, getBlue return an integer between 0 and 255 representing amount –Graphics method setColor sets drawing color Takes Color object –Method getColor gets current color setting

10 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.3Color Control

11 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.3Color Control

12 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. ShowColors.java (1 of 2)

13 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. ShowColors.java (2 of 2)

14 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.3Color Control Component JColorChooser –Displays dialog allowing user to select a color –Method showDialog First argument: reference to parent Component (window from which dialog being displayed) –Modal dialog - user cannot interact with other dialogs while active Second argument: String for title bar Third argument: Initial selected color Returns a Color object Class Container –Method setBackground - takes Color object –Sets background color

15 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. ShowColors2.java (1 of 2)

16 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. ShowColors2.java (2 of 2)

17 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.3Color Control Fig. 28.7 The HSB and RGB tabs of the JColorChooser dialog.

18 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.3Color Control Fig. 28.7 The HSB and RGB tabs of the JColorChooser dialog.

19 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.4Font Control

20 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.4Font Control

21 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.4Font Control Class Font –Constructor takes three arguments public Font( String name, int style, int size) name: any font supported by system ( Serif, Monospaced ) style: constants FONT.PLAIN, FONT.ITALIC, FONT.BOLD –Combinations: FONT.ITALIC + FONT.BOLD size: measured in points (1/72 of an inch) –Usage: g.setFont( fontObject );

22 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Fonts.java (1 of 2)

23 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Fonts.java (2 of 2)

24 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.4Font Control Figure 28.9 Using Graphics method setFont to change Font s.

25 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.4Font Control Class FontMetrics –Has methods for getting font metrics –g.getFontMetrics - returns FontMetrics object

26 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.4Font Control

27 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Metrics.java (1 of 2)

28 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Metrics.java (2 of 2)

29 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.4 Font Control Figure 28.12 Obtaining font metric information.

30 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.5Drawing Lines, Rectangles and Ovals

31 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.5Drawing Lines, Rectangles and Ovals

32 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. LinesRectsOvals.j ava (1 of 2)

33 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. LinesRectsOvals.j ava (2 of 2)

34 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.5Drawing Lines, Rectangles and Ovals Figure 28.14 Demonstrating Graphics method drawLine. drawLinedrawRectfillRectdraw3DRect fill3DRect fillOvaldrawOvaldrawRoundRectfillRoundRect

35 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.5Drawing Lines, Rectangles and Ovals

36 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.5Drawing Lines, Rectangles and Ovals

37 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.6Drawing Arcs Arc –Portion of an oval –Arc angles measured in degrees Starts at a starting angle and sweeps the number of degrees specified by arc angle Positive - counterclockwise Negative - clockwise –When drawing an arc, specify bounding rectangle for an oval –drawArc( x, y, width, height, startAngle, arcAngle ) –fillArc - as above, but draws a solid arc (sector)

38 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.6Drawing Arcs

39 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.6Drawing Arcs

40 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. DrawArcs.java (1 of 3)

41 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. DrawArcs.java (2 of 3)

42 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. DrawArcs.java (3 of 3)

43 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.7Drawing Polygons and Polylines Polygon - multisided shape –In Java, class Polygon java.awt Polyline - series of connected points

44 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.7Drawing Polygons and Polylines

45 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. DrawPolygons.java (1 of 3)

46 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. DrawPolygons.java (2 of 3)

47 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. DrawPolygons.java (3 of 3)

48 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.7Drawing Polygons and Polylines Figure 28.21 Demonstrating drawPolygon and fillPolygon. Result of line 22Result of line 41Result of line 32 Result of line 27

49 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.8The Java2D API Java2D API –Advanced two dimensional graphics capabilities –Too many capabilities to cover (for overview, see demo) Drawing with the Java2D API –Use instance of class Graphics2D (package java.awt ) Subclass of Graphics Has all graphics capabilities we have previously discussed –Must downcast Graphics reference passed to paint Graphics2D g2d = ( Graphics2D ) g; –This technique used in programs of next section

50 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.9Java2D Shapes Sample methods from Graphics2D –setPaint ( paintObject ) Paint object is an object of a class that implements java.awt.Paint Can be an object of class Color, GradientPaint, SystemColor, TexturePaint –GradientPaint ( x1, y1, color1, x2, y2, color2, cyclic ) Creates a gradient (slowly changing color) from x1, y1, to x2, y2, starting with color1 and changing to color2 If cyclic true, then cyclic gradient (keeps transitioning colors) –If acyclic, only transitions colors once

51 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.9Java2D Shapes Sample methods from Graphics2D –fill ( shapeObject ) Draws a filled Shape object Instance of any class that implements Shape ( java.awt ) Ellipse2D.Double, Rectangle2D.Double Double-precision inner classes of Ellipse2D –setStroke( strokeObject ) Set a shape's borders Instance of a class that implements Stroke ( java.awt ) BasicStroke( width ) - One of many constructors –This constructor specifies width in pixels of border

52 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.9Java2D Shapes Sample methods from Graphics2D –draw ( shapeObject ) Draws specified Shape object –Class BufferedImage Can produce images in color or grayscale Can create patterns by drawing into the BufferedImage object –Class TexturePaint Constructor can take BufferedImage and shape to fill Object of class TexturePaint then drawn using setPaint Book has further details

53 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.9Java2D Shapes Class Arc2D.Double –Similar to normal arcs, except has another argument at end Arc2D.PIE - close arc with two lines Arc2D.CHORD - draws line from endpoints of arc Arc2D.OPEN - arc not closed Class BasicStroke –Can be used to create customized dashed lines, set how lines end and join

54 © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. 28.9Java2D Shapes Class GeneralPath –A general path is a shape made from lines and curves –Method moveTo Specifies first point in a general path –Method lineTo Draws a line to next point in general path –Method closePath Draws line from last point to point specified in last call to moveTo Other methods –rotate( radians ) - rotate next shape around origin –translate(x, y) - translates origin to x, y

55 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Shapes.java (1 of 4)

56 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Shapes.java (2 of 4)

57 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Shapes.java (3 of 4)

58 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Shapes.java (4 of 4)

59 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Shapes2.java (1 of 3)

60 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Shapes2.java (2 of 3)

61 Outline © Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Shapes2.java (3 of 3) Program Output

Download ppt "© Copyright 1992–2004 by Deitel & Associates, Inc. and Pearson Education Inc. All Rights Reserved. Chapter 28 - Java Graphics and Java2D Outline 28.1Introduction."

Similar presentations

Graphics You draw on a Graphics object The Graphics object cannot directly be created by your code, instead one is generated when the method paintComponent.

Graphics You draw on a Graphics object The Graphics object cannot directly be created by your code, instead one is generated when the method paintComponent.
Graphics Chapter 16.  If you want to draw shapes such as a bar chart, a clock, or a stop sign, how do you do it?

Graphics Chapter 16.  If you want to draw shapes such as a bar chart, a clock, or a stop sign, how do you do it?
Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 1 Chapter 2 2D Graphics: Basics.

Zhang & Liang, Computer Graphics Using Java 2D and 3D (c) 2007 Pearson Education, Inc. All rights reserved. 1 Chapter 2 2D Graphics: Basics.
Georgia Institute of Technology Drawing in Java – part 2 Barb Ericson Georgia Institute of Technology September 2005.

Georgia Institute of Technology Drawing in Java – part 2 Barb Ericson Georgia Institute of Technology September 2005.
Java Graphics Section 1 - Multi-File Graphics Programs Section 2 - The Coordinate System and Graphics Context g Section 3 - The Java Drawing and Painting.

Java Graphics Section 1 - Multi-File Graphics Programs Section 2 - The Coordinate System and Graphics Context g Section 3 - The Java Drawing and Painting.
1 Graphics -- Introduction zThe use of graphics is common among modern software systems  Java has strong API support for graphics in the java.awt (abstract.

1 Graphics -- Introduction zThe use of graphics is common among modern software systems  Java has strong API support for graphics in the java.awt (abstract.
GUI and Swing, part 2 The illustrated edition. Scroll bars As we have previously seen, a JTextArea has a fixed size, but the amount of text that can be.

GUI and Swing, part 2 The illustrated edition. Scroll bars As we have previously seen, a JTextArea has a fixed size, but the amount of text that can be.
Graphics in Java Part II. Lecture Objectives Learn how to use Graphics in Java.

Graphics in Java Part II. Lecture Objectives Learn how to use Graphics in Java.
1 L36 Graphics and Java 2D™ (1). 2 OBJECTIVES  To understand graphics contexts and graphics objects.  To understand and be able to manipulate colors.

1 L36 Graphics and Java 2D™ (1). 2 OBJECTIVES  To understand graphics contexts and graphics objects.  To understand and be able to manipulate colors.
1 Chapter 15 l Basic Figures l Colors l Fonts and Other Text Details Graphics Objects.

1 Chapter 15 l Basic Figures l Colors l Fonts and Other Text Details Graphics Objects.
 2000 Prentice Hall, Inc. All rights reserved. Chapter 28 - Java Graphics and Java2D Outline 28.1Introduction 28.2Graphics Contexts and Graphics Objects.

 2000 Prentice Hall, Inc. All rights reserved. Chapter 28 - Java Graphics and Java2D Outline 28.1Introduction 28.2Graphics Contexts and Graphics Objects.
©The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Topics  Applets  Classes used for graphics Graphics Point Dimension.

©The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Topics  Applets  Classes used for graphics Graphics Point Dimension.
Slides prepared by Rose Williams, Binghamton University Chapter 19 Swing II.

Slides prepared by Rose Williams, Binghamton University Chapter 19 Swing II.
1 L37 Graphics and Java 2D™ (2). 2 OBJECTIVES To use methods of class Graphics to draw lines,  rectangles,  rectangles with rounded corners,  three-dimensional.

1 L37 Graphics and Java 2D™ (2). 2 OBJECTIVES To use methods of class Graphics to draw lines,  rectangles,  rectangles with rounded corners,  three-dimensional.
May 11, 1998CS102-02Lecture 7-1 More Graphics in Java CS 102-02 Lecture 7-1 A picture's worth a thousand words.

May 11, 1998CS102-02Lecture 7-1 More Graphics in Java CS Lecture 7-1 A picture's worth a thousand words.
 2005 Pearson Education, Inc. All rights reserved. 1 12 Graphics and Java 2D™

 2005 Pearson Education, Inc. All rights reserved Graphics and Java 2D™
1 L38 Graphics and Java 2D™ (3). 2 OBJECTIVES In this chapter you will learn:  To understand graphics contexts and graphics objects.  To understand.

1 L38 Graphics and Java 2D™ (3). 2 OBJECTIVES In this chapter you will learn:  To understand graphics contexts and graphics objects.  To understand.
©The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 4 th Ed Chapter 5 - 1 Chapter 5 Java Graphics Applets.

©The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 4 th Ed Chapter Chapter 5 Java Graphics Applets.
©The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 4 th Ed Chapter 5 - 1 Chapter 5 Applets and Graphics.

©The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 4 th Ed Chapter Chapter 5 Applets and Graphics.
 2003 Prentice Hall, Inc. All rights reserved. 1 Outline 12.1 Introduction 12.2 Graphics Contexts and Graphics Objects 12.3 Color Control 12.4 Font Control.

 2003 Prentice Hall, Inc. All rights reserved. 1 Outline 12.1 Introduction 12.2 Graphics Contexts and Graphics Objects 12.3 Color Control 12.4 Font Control.

Similar presentations

Ads by Google