Deck 16: Graphics

Question 1

The drawRoundRect() method requires ____ arguments.

A) three
B) four
C) six
D) eight

Answer 1

C

Question 2

You can instruct a Graphics object to use a font by inserting the font as the argument in a ____ method.

A) setColor()
B) drawString()
C) setCharacters()
D) setFont()

Answer 2

D

Question 3

In Java, whether a paint request is triggered by the system or an application, a Component's paint() method is invoked.

Answer 3

True

Question 4

The ____ method draws what appears to be an empty rectangle.

A) clearRect()
B) emptyRect()
C) fillRect()
D) drawRect()

Question 5

The ____ method in the Graphics class allows you to draw a String on a JPanel or other component .

A) drawString()
B) setFont()
C) drawLine()
D) setString()

Question 6

The statements pen.drawLine(50, 50, 100, 200); and pen.drawLine(100, 200, 50, 50); will both draw straight lines that slant down and to the right.

Question 7

The drawPolygon() method requires four arguments, two integer arrays, and two single integers.

Question 8

System-triggered painting occurs when a program requests it, usually because the internal state of a component has changed.

Question 9

A rectangle created with the clearRect() method is not transparent.

Question 10

The getScreenSize()  method returns an object of type Pixels , which specifies the width  and height of the screen in pixels.

Question 11

The FontMetrics class methods return an integer value representing the font size in points, with one point measuring 1/72 of an inch.

Question 12

If you want to change graphic output on a panel in response to a user's mouse click, you would place a call to ____ in the actionPerformed() method.

A) paint()
B) paintComponent()
C) paintBorder()
D) repaint()

Question 13

The first step in drawing a 2D object is to specify how a drawn object is rendered.

Question 14

When a Swing object such as JPanel calls the repaint() method, it calls paint(), paintComponent(), paintBorder() , and which of the following?

A) paintChildren()
B) paintSuper()
C) paintBody()
D) paintGraphic()

Question 15

The ____ method requires four arguments and draws the outline of a rectangle using the current drawing color.

A) clearRect()
B) drawRect()
C) fillRect()
D) paintRect()

Question 16

When using the drawRoundRect() method, if you assign ____ to the arc coordinates, the rectangle is not rounded; instead, the corners are square.

A) -1
B) 0
C) 10
D) 99

Question 17

Both Rectangle2D.Float and Rectangle2D.Double can be created using four arguments representing the x-coordinate, y-coordinate, width, and height.

Question 18

You don't usually call the paint() method directly; instead the ____ method calls the paint() method.

A) destroy()
B) actionPerformed()
C) repaint()
D) super()

Question 19

The lineTo() method is used to define the beginning point of a polygon.

Question 20

You can instruct a Graphics object named g to produce green output by using which of the following statements?

A) g.makeColor(Color.GREEN);
B) g.makeColor(GREEN.Color);
C) g.setColor(Color.GREEN);
D) g.setColor( GREEN. Color);

Question 21

The ____ method provides information about the system in use.

A) getSystemInfo()
B) getDefaultToolkit()
C) getDefaultControlPanel()
D) getToolkit()

Question 22

If the beginning and ending points used with the fillPolygon() method are ____, the two endpoints are connected by a straight line before the polygon is filled with color.

A) connected
B) coordinate pairs
C) identical
D) not identical

Question 23

Which of the following statements starts a polygon named pol at the coordinates 20 and 290?

A) pol.moveTo(20F, 290F);
B) pol.lineTo(20F, 290F);
C) pol = new Path(20F, 290F);
D) pol.newPath(20F, 290F);

Question 24

You use the ____________________ method in statements to add points to a polygon.

Question 25

The ____________________ method can be used when a window needs to be updated, such as when it contains new images or you have moved a new object onto the screen.

Question 26

BasicStroke class variables determine the endcap and ____ style arguments.

A) stroke
B) line
C) juncture
D) fill

Question 27

You can discover the fonts that are available on your system by using the ____ method.

A) searchFonts()
B) findFonts()
C) findAllFonts()
D) getAvailableFontFamilyNames()

Question 28

The ____________________ method returns an object of type Dimension , which specifies the width and height of the screen in pixels.

Question 29

____ is the amount of space between the bottom of the descent of one line and the top of the characters in the successive line of type.

A) Descent
B) Ascent
C) Leading
D) Height of a line

Question 30

The ____ method creates a solid arc.

A) solidArc()
B) fillArc()
C) clearArc()
D) drawArc()

Question 31

The draw3DRect() method has a ____ argument, which controls whether the rectangle is darker on the right and bottom, or lighter on the right and bottom.

A) cyclic gradient
B) fill pattern
C) null
D) Boolean value

Question 32

Which FontMetrics class method returns information about the part of characters that hang below the baseline?

A) getLeading()
B) getAscent()
C) get_Descent()
D) getHeight()

Question 33

To create an arc object named halfArc that looks like the top half of a circle, which of the following statements can you use to produce identical results to this statement? halfArc.drawArc(x, y, w, h, 0, 180); .

A) halfArc.drawArc(x, y, w, h, 180, 0);
B) halfArc.drawArc(x, y, w, h, 180, -180);
C) halfArc.drawArc(x, y, w, h, -180, 180);
D) fillArc.drawArc(x, y, w, h, 180, -180);

Question 34

Which of the following statements will correctly add a point to a polygon named myShape ?

A) myShape.addPoint(50, 100)
B) addPoint = myShape(50, 100)
C) myShape.fillPolygon(50 100)
D) myShape = addPoint(50, 100)

Question 35

You can use the ____ method to copy any rectangular area to a new location.

A) copyRect()
B) copyArea()
C) copyGraphics()
D) addPoint()

Question 36

You can improve the appearance of strings drawn using Graphics objects by using the ____________________ method.

Question 37

You specify 2D colors by using the ____ method.

A) paint()
B) setPaint()
C) color()
D) setColor()

Question 38

You can instantiate an empty Polygon object using which of the following statements?

A) Polygon someFutureShape = new Polygon(0,0,0,0);
B) Polygon someFutureShape = new Polygon();
C) Polygon someFutureShape = new Polygon(0);
D) Polygon someFutureShape = new Polygon(xPoints, yPoints, xPoints.length);

Question 39

You use the ____________________ method to draw a rectangle that appears to have "shadowing" on two of its edges and light "highlights" on two others.

Question 40

Which of the following is a gradual shift from one color at one coordinate point to a different color at a second coordinate point?

A) color shift
B) gradient fill
C) fill pattern
D) cyclic fill

Question 42

Write the statement to set the font of a Graphics object named myStyle to the font fancyFont .

Question 43

What activities does the process of drawing with Java 2D objects include?

Question 44

Write the statement to create an Arc2D.Float object named myArc at 20, 143, with a width of 50 and a height of 43; with a starting degree of 50, 140 degrees traveled; and using the class variable Arc2D.PIE .

Question 45

What parameters does the copyArea() method require?

Question 46

Describe what happens when a Swing component such as a JPanel calls the repaint() method.

Question 47

BasicStroke myLine = new BasicStroke(12.0f, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_ROUND);
The above statement creates a BasicStroke object and makes it the current stroke. Describe the three arguments that are used in this statement, and then describe the purpose of each.

Question 48

To create a rectangle with rounded corners, the drawRoundRect() method is used. Describe the six arguments that are required to create rounded rectangles.

Question 49

How can a programmer find and gather all the available fonts on a computer system?

Question 50

Write the statement that uses an object named brush  to draw a string that says "I'm here" with the lower-left corner of the string appearing at coordinates x=100, y=110.

Question 51

How do you use the drawOval() method to draw an oval?

Question 52

The draw3DRect() method is used to draw rectangles that appear to have "shadowing" on two of their edges. Five arguments are used to create shadowed rectangles. Describe the five arguments.

Question 53

Write the statement to draw a rectangle using a graphics object named myRect that begins at position 30, 100 and is 150 pixels wide by 40 pixels tall.

Question 54

In the drawPolygon() method, what are the three arguments and what values do they represent?

Question 55

List the six arguments you need to provide for the drawArc() method.

Question 56

A Polygon object is created by defining movements from one point to another. Describe the statements that are used to create a Polygon object.

Question 57

Write the statement that will create a BasicStroke object named myLine and make it the current stroke. The line width should be 3, the endcap style should be CAP_ROUND and the juncture style should be JOIN_BEVEL .

Question 58

Why would a programmer use the repaint() method?

Question 59

What are the three arguments the BasicStroke constructor takes?

Question 60

What are the constructors for the Dimension class?

Question 61

The getFontMetrics() method can be used to discover a font's statistics. Describe the getLeading() , getAscent() , getDescent() , and getHeight() methods, and how they are used with the getFontMetrics() method.

Question 62

Write the statement to create a Rectangle2D.Float object named myRect at 20, 20 with a width of 80 and height of 50.

Question 63

Write the setPaint() statement that will set a cyclic gradient that cycles between red and yellow that begins at coordinates 40, 60 and ends at coordinates 210, 120. The 2D graphics object you use in the statement should be named graph2D.

Question 64

import javax.swing.*;
import java.awt.*;
import java.awt.Color;
public class JDemo3DRectangles extends JPanel
{
   @Override
   public void paint(Graphics gr)
   {
      super.paint(gr);
      final int WIDTH = 60, HEIGHT = 80;
      gr.setColor(Color.PINK);
      gr.fill3DRect(20, 40, WIDTH, HEIGHT, true);
      gr.fill3DRect(100, 40, WIDTH, HEIGHT, false);
   }
   public static void main(String[] args)
   {
      JFrame frame = new JFrame();
      frame.add(new JDemo3DRectangles());;
      frame.setSize(200, 180);
      frame.setVisible(true);
   }
}
The highlighted code above creates two filled 3D rectangles. Describe how the color of the rectangles is set, and explain the five arguments that are used to draw the rectangles.

Question 65

A rectangle is drawn with the following statement:
tool.drawRect(50, 50, 100, 60);
An oval is drawn with the following statement:
tool.drawOval(50, 50, 100, 60);
Describe the resulting output, and describe how the four arguments are used to draw the objects.

Question 66

Write the statement to instruct a Graphics object named myGraphic to apply blue paint.