Presentation is loading. Please wait.

Presentation is loading. Please wait.

Merete S COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics ikt403 – Object-Oriented Software Development.

Published byElinor Owens Modified over 8 years ago

Similar presentations

Presentation on theme: "Merete S COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics ikt403 – Object-Oriented Software Development."— Presentation transcript:

1 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics ikt403 – Object-Oriented Software Development

2 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Introduction Java contains support for graphics that enable programmers to visually enhance applications Java contains many more sophisticated drawing capabilities as part of the Java 2D API Classes –Color –Font, FontMetrics –Graphics2D –Polygon –BasicStroke –GradientPaint, TexturePaint –Java 2D shape classes

3 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE

4 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Introduction Java coordinate system –Upper-left corner of a GUI component has the coordinates (0, 0) –Contains x-coordinate (horizontal coordinate) - horizontal distance moving right from the left of the screen –Contains y-coordinate (vertical coordinate) - vertical distance moving down from the top of the screen Coordinate units are measured in pixels. A pixel is a display monitor’s smallest unit of resolution.

5 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Java coordinate system. Units are measured in pixels.

6 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics Contexts and Graphics Objects A Java graphics context enables drawing on the screen Class Graphics –Manages a graphics context and draws pixels on the screen –An abstract class – contributes to Java’s portability Method paintComponent –Used to draw graphics –Member of class JComponent, subclass of Component –Graphics object passed to paintComponent by the system when a lightweight Swing component needs to be repainted –If programmer needs to have paintComponent execute, a call is made to method repaint

7 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Color Control Class Color declares methods and constants for manipulating colors in a Java program Every color is created from a red, a green and a blue component – RGB values

8 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Color constants and their RGB values.

9 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Color methods and color-related Graphics methods.

10 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Method paintComponent paints JPanel Set current drawing color with method setColor Draw filled rectangle using current color Draw text value of current colorSet current drawing color, specify float arguments to Color constructor Set current drawing color using Color constant

11 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Retrieving RGB values using methods getRed, getGreen and getBlue

12 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline

13 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Font Control Class Font –Constructor takes three arguments—the font name, font style and font size Font name – any font currently supported by the system on which the program is running Font style – Font.PLAIN, Font.ITALIC or Font.BOLD. Font styles can be used in combination Font sizes – measured in points. A point is 1/72 of an inch. –Methods getName, getStyle and getSize retrieve information about Font object –Graphics methods getFont and setFont retrieve and set the current font, respectively

14 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Font-related methods and constants.

15 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Font-related methods and constants.

16 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Creating Font objects Font nameFont style Font size

17 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Combining styles Retrieve font name and size of Graphics object’s current Font

18 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline

19 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Drawing Lines, Rectangles and Ovals Graphics methods for drawing lines, rectangles and ovals –fillRoundRect and drawRoundRect – draw rectangles with rounded corners –bounding rectangle—the area in which a rounded rectangle or oval will be drawn –draw3DRect and fill3DRect – draw a 3D rectangle that is either raised or lowered –drawOval and fillOval – draw ovals

20 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics methods that draw lines, rectangles and ovals.

21 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics methods that draw lines, rectangles and ovals.

22 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Draw a straight lineDraw an empty rectangleDraw a filled rectangle

23 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Draw a filled rectangle with rounded cornersDraw an empty rectangle with rounded cornersDraw an empty rectangle that is raisedDraw a filled rectangle that is loweredDraw an empty ovalDraw a filled oval

24 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline

25 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline fillRoundRect drawRoundRect drawOval fillOval drawLine drawRect fillRect draw3DRect fill3DRect

26 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Drawing Arcs An arc is drawn as a portion of an oval Arcs sweep (i.e., move along a curve) from a starting angle by the number of degrees specified by their arc angle –Counterclockwise sweep measured in positive degrees –Clockwise sweep measured in negative degrees Graphics methods drawArc and fillArc are used to draw arcs

27 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Positive and negative arc angles.

28 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics methods for drawing arcs.

29 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline x- and y-coordinates for upper left corner of bounding rectangle Width and height of bounding rectangle Starting angle Sweep angle Draw empty arcs

30 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Draw filled arcs Negative values indicate arc should sweep clockwise

31 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline

32 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline

33 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Drawing Polygons and Polylines Polygons –Closed multisided shapes composed of straight line segments –Graphics methods drawPolygon and fillPolygon to display polygons –Polygons can be represented using class Polygon – class contains method addPoint to add points to a Polygon Polylines –Sequences of connected points –Graphics method drawPolyline to display polylines

34 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics methods for polygons and class Polygon methods.

35 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics methods for polygons and class Polygon methods.

36 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Create Polygon object from sets of x- and y-coordinates Draw an empty Polygon Draw polyline from sets of x- and y-coordinates

37 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Draw polygon from sets of x- and y-coordinates, without creating Polygon object Add coordinates to Polygon with method addPoint

38 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline

39 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE Outline Result of line 28 Result of line 37 Result of line 23 Result of line 18

40 Merete S Tveit@AGDER COLLEGEFACULTY OF ENGINEERING & SCIENCE

Download ppt "Merete S COLLEGEFACULTY OF ENGINEERING & SCIENCE Graphics ikt403 – Object-Oriented Software Development."

Similar presentations

Chapter 13 Graphics.

Chapter 13 Graphics.
Custom Painting Gestione della Grafica customizzata Vedi anche:

Custom Painting Gestione della Grafica customizzata Vedi anche:
Applets and Graphics.

Applets and Graphics.
2D Graphics Drawing Things. Graphics In your GUI, you might want to draw graphics E.g. draw lines, circles, shapes, draw strings etc The Graphics class.

2D Graphics Drawing Things. Graphics In your GUI, you might want to draw graphics E.g. draw lines, circles, shapes, draw strings etc The Graphics class.
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?
PHY-102 SAPIntroductory GraphicsSlide 1 Introductory Graphics In this section we will learn how about how to draw graphics on the screen in Java:  Drawing.

PHY-102 SAPIntroductory GraphicsSlide 1 Introductory Graphics In this section we will learn how about how to draw graphics on the screen in Java:  Drawing.
LAB SESSION 7 Graphical user interface Applet fundamentals Methods in applets Execution of an applet Graphics class.

LAB SESSION 7 Graphical user interface Applet fundamentals Methods in applets Execution of an applet Graphics class.
Graphics CSCI 201L Jeffrey Miller, Ph.D. HTTP :// WWW - SCF. USC. EDU /~ CSCI 201 USC CSCI 201L.

Graphics CSCI 201L Jeffrey Miller, Ph.D. HTTP :// WWW - SCF. USC. EDU /~ CSCI 201 USC CSCI 201L.
Draw Shapes Introduction to simple graphics. What is a graphics context? An instance of the Graphics class Graphics is ABSTRACT! You can extend Graphics.

Draw Shapes Introduction to simple graphics. What is a graphics context? An instance of the Graphics class Graphics is ABSTRACT! You can extend Graphics.
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.
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.
©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.
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 Applets Chapter 1 To understand:  why applets are used to extend the capabilities of Web pages  how an applet is executed and know about the restrictions.

1 Applets Chapter 1 To understand:  why applets are used to extend the capabilities of Web pages  how an applet is executed and know about the restrictions.

Similar presentations

Ads by Google