Podcast
Questions and Answers
In the Java coordinate system, the point (0, 0) is ________.
In the Java coordinate system, the point (0, 0) is ________.
the upper-left corner of the screen.
The fact that class Graphics is abstract contributes to Java's portability because ________.
The fact that class Graphics is abstract contributes to Java's portability because ________.
drawing is performed differently on every platform that supports Java. A subclass of Graphics must be created that uses the drawing capabilities of the current platform.
Which of the following statements about the Graphics object is true?
Which of the following statements about the Graphics object is true?
- The Graphics class is abstract. (correct)
- The Graphics object manages a graphics context. (correct)
- The Graphics object is the argument to a lightweight GUI component's paintComponent method. (correct)
- The Graphics object is instantiated by the user.
- The Graphics object is an argument to class Component's repaint method.
Which of the following are valid Java statements?
Which of the following are valid Java statements?
The JColorChooser dialog allows colors to be chosen by all but which of the following?
The JColorChooser dialog allows colors to be chosen by all but which of the following?
Which of the following properly creates and initializes a Font object?
Which of the following properly creates and initializes a Font object?
Method getFont of class Graphics returns ________.
Method getFont of class Graphics returns ________.
Which of the following is correct for font metrics?
Which of the following is correct for font metrics?
Class FontMetrics declares methods that can be used to obtain the following font metrics ________.
Class FontMetrics declares methods that can be used to obtain the following font metrics ________.
The Java statement: g.fillOval(290, 100, 90, 55);
The Java statement: g.fillOval(290, 100, 90, 55);
The Java statement: g.draw3DRect(290, 100, 90, 55, true);
The Java statement: g.draw3DRect(290, 100, 90, 55, true);
Study Notes
Java Coordinate System
- In the Java coordinate system, (0, 0) is located at the upper-left corner of the screen.
Class Graphics and Portability
- Class Graphics is abstract to ensure methods are implemented to fit the drawing capabilities of the current platform, enhancing Java's portability.
Graphics Object Characteristics
- The Graphics object is crucial for rendering in Java; it is passed to methods like
paintComponentin lightweight GUI components and is abstract.
Valid Java Statements for Color
- The valid statements for creating a Color object in Java include:
Color c = new Color(0, 255, 0);Color c = new Color(0.0f, 1.0f, 0.0f);
JColorChooser Dialog
- The JColorChooser dialog allows color selection through swatches, hue/saturation/brightness, and red/green/blue options, excluding gradient and cycle settings.
Creating Font Objects
- A proper way to create and initialize a Font object is using:
Font f = new Font("Serif", Font.Bold + Font.Italic, 19);
Font Object Return from Graphics
- The
getFontmethod of class Graphics returns a Font object representing the current font settings.
Font Metrics
- Font metrics are defined as:
height = descent + ascent + leading
Class FontMetrics Methods
- Class FontMetrics includes methods to obtain various font metrics: ascent, descent, height, and leading.
Drawing with fillOval
- The method
g.fillOval(290, 100, 90, 55)draws a filled oval within a rectangle specified by its upper-left corner at (290, 100) with a width of 90 and height of 55.
Drawing 3D Rectangles
- The method
g.draw3DRect(290, 100, 90, 55, true)creates a simulated raised rectangle, with darker edges on the bottom and right.
Studying That Suits You
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Description
Test your knowledge on Java 2D graphics concepts with these flashcards. This quiz covers key terms and principles related to the Java coordinate system and the Graphics class. Ideal for students studying graphics in Java.
