java.lang.Object
- edu.princeton.cs.algs4.Draw

所有已实现的接口:

java.awt.event.ActionListener, java.awt.event.KeyListener, java.awt.event.MouseListener, java.awt.event.MouseMotionListener, java.util.EventListener
```
public final class Draw
extends java.lang.Object
implements java.awt.event.ActionListener, java.awt.event.MouseListener, java.awt.event.MouseMotionListener, java.awt.event.KeyListener
```
Draw. This class provides a basic capability for creating drawings with your programs. It uses a simple graphics model that allows you to create drawings consisting of points, lines, and curves in a window on your computer and to save the drawings to a file. This is the object-oriented version of standard draw; it supports multiple indepedent drawing windows.
For additional documentation, see Section 3.1 of Computer Science: An Interdisciplinary Approach by Robert Sedgewick and Kevin Wayne.

字段概要

字段
修饰符和类型	字段	说明
`static java.awt.Color`	`BLACK`	The color black.
`static java.awt.Color`	`BLUE`	The color blue.
`static java.awt.Color`	`BOOK_BLUE`	Shade of blue used in Introduction to Programming in Java.
`static java.awt.Color`	`BOOK_LIGHT_BLUE`	Shade of light blue used in Introduction to Programming in Java.
`static java.awt.Color`	`BOOK_RED`	Shade of red used in Algorithms, 4th edition.
`static java.awt.Color`	`CYAN`	The color cyan.
`static java.awt.Color`	`DARK_GRAY`	The color dark gray.
`static java.awt.Color`	`GRAY`	The color gray.
`static java.awt.Color`	`GREEN`	The color green.
`static java.awt.Color`	`LIGHT_GRAY`	The color light gray.
`static java.awt.Color`	`MAGENTA`	The color magenta.
`static java.awt.Color`	`ORANGE`	The color orange.
`static java.awt.Color`	`PINK`	The color pink.
`static java.awt.Color`	`PRINCETON_ORANGE`	Shade of orange used in Princeton's identity.
`static java.awt.Color`	`RED`	The color red.
`static java.awt.Color`	`WHITE`	The color white.
`static java.awt.Color`	`YELLOW`	The color yellow.

构造器概要

构造器
构造器说明

Draw()
Initializes an empty drawing object.

Draw(java.lang.String name)
Initializes an empty drawing object with the given name.

方法概要

修饰符和类型	方法	说明
`void`	`actionPerformed(java.awt.event.ActionEvent e)`	This method cannot be called directly.
`void`	`addListener(DrawListener listener)`	Adds a `DrawListener` to listen to keyboard and mouse events.
`void`	`arc(double x, double y, double radius, double angle1, double angle2)`	Draws a circular arc of the specified radius, centered at (x, y), from angle1 to angle2 (in degrees).
`void`	`circle(double x, double y, double radius)`	Draws a circle of the specified radius, centered at (x, y).
`void`	`clear()`	Clears the screen to the default color (white).
`void`	`clear(java.awt.Color color)`	Clears the screen to the given color.
`void`	`disableDoubleBuffering()`	Disable double buffering.
`void`	`ellipse(double x, double y, double semiMajorAxis, double semiMinorAxis)`	Draws an ellipse with the specified semimajor and semiminor axes, centered at (x, y).
`void`	`enableDoubleBuffering()`	Enable double buffering.
`void`	`filledCircle(double x, double y, double radius)`	Draws a filled circle of the specified radius, centered at (x, y).
`void`	`filledEllipse(double x, double y, double semiMajorAxis, double semiMinorAxis)`	Draws a filled ellipse with the specified semimajor and semiminor axes, centered at (x, y).
`void`	`filledPolygon(double[] x, double[] y)`	Draws a filled polygon with the vertices (x₀, y₀), (x₁, y₁), ..., (x_n–1, y_n–1).
`void`	`filledRectangle(double x, double y, double halfWidth, double halfHeight)`	Draws a filled rectangle of the specified size, centered at (x, y).
`void`	`filledSquare(double x, double y, double halfLength)`	Draws a square of the specified size, centered at (x, y).
`java.awt.Font`	`getFont()`	Gets the current font.
`javax.swing.JLabel`	`getJLabel()`	Gets the current `JLabel` for use in some other GUI.
`java.awt.Color`	`getPenColor()`	Gets the current pen color.
`double`	`getPenRadius()`	Gets the current pen radius.
`boolean`	`hasNextKeyTyped()`	Returns true if the user has typed a key.
`boolean`	`isKeyPressed(int keycode)`	Returns true if the keycode is being pressed.
`boolean`	`isMousePressed()`	Returns true if the mouse is being pressed.
`void`	`keyPressed(java.awt.event.KeyEvent e)`	This method cannot be called directly.
`void`	`keyReleased(java.awt.event.KeyEvent e)`	This method cannot be called directly.
`void`	`keyTyped(java.awt.event.KeyEvent e)`	This method cannot be called directly.
`void`	`line(double x0, double y0, double x1, double y1)`	Draws a line from (x0, y0) to (x1, y1).
`static void`	`main(java.lang.String[] args)`	Test client.
`void`	`mouseClicked(java.awt.event.MouseEvent e)`	This method cannot be called directly.
`void`	`mouseDragged(java.awt.event.MouseEvent e)`	This method cannot be called directly.
`void`	`mouseEntered(java.awt.event.MouseEvent e)`	This method cannot be called directly.
`void`	`mouseExited(java.awt.event.MouseEvent e)`	This method cannot be called directly.
`void`	`mouseMoved(java.awt.event.MouseEvent e)`	This method cannot be called directly.
`boolean`	`mousePressed()`	已过时。 replaced by `isMousePressed()`
`void`	`mousePressed(java.awt.event.MouseEvent e)`	This method cannot be called directly.
`void`	`mouseReleased(java.awt.event.MouseEvent e)`	This method cannot be called directly.
`double`	`mouseX()`	Returns the x-coordinate of the mouse.
`double`	`mouseY()`	Returns the y-coordinate of the mouse.
`char`	`nextKeyTyped()`	The next key typed by the user.
`void`	`pause(int t)`	Pause for t milliseconds.
`void`	`picture(double x, double y, java.lang.String filename)`	Draws the specified image centered at (x, y).
`void`	`picture(double x, double y, java.lang.String filename, double degrees)`	Draws the specified image centered at (x, y), rotated given number of degrees.
`void`	`picture(double x, double y, java.lang.String filename, double scaledWidth, double scaledHeight)`	Draws the specified image centered at (x, y), rescaled to the specified bounding box.
`void`	`picture(double x, double y, java.lang.String filename, double scaledWidth, double scaledHeight, double degrees)`	Draws the specified image centered at (x, y), rotated given number of degrees, and rescaled to the specified bounding box.
`void`	`point(double x, double y)`	Draws a point at (x, y).
`void`	`polygon(double[] x, double[] y)`	Draws a polygon with the vertices (x₀, y₀), (x₁, y₁), ..., (x_n–1, y_n–1).
`void`	`rectangle(double x, double y, double halfWidth, double halfHeight)`	Draws a rectangle of the specified size, centered at (x, y).
`void`	`save(java.lang.String filename)`	Saves the drawing to using the specified filename.
`void`	`setCanvasSize(int canvasWidth, int canvasHeight)`	Sets the canvas (drawing area) to be width-by-height pixels.
`void`	`setDefaultCloseOperation(int value)`	Sets the default close operation.
`void`	`setFont()`	Sets the font to the default font (sans serif, 16 point).
`void`	`setFont(java.awt.Font font)`	Sets the font to the given value.
`void`	`setLocationOnScreen(int x, int y)`	Sets the upper-left hand corner of the drawing window to be (x, y), where (0, 0) is upper left.
`void`	`setPenColor()`	Sets the pen color to the default color (black).
`void`	`setPenColor(int red, int green, int blue)`	Sets the pen color to the given RGB color.
`void`	`setPenColor(java.awt.Color color)`	Sets the pen color to the given color.
`void`	`setPenRadius()`	Sets the pen size to the default (.002).
`void`	`setPenRadius(double radius)`	Sets the radius of the pen to the given size.
`void`	`setXscale()`	Sets the x-scale to be the default (between 0.0 and 1.0).
`void`	`setXscale(double min, double max)`	Sets the x-scale.
`void`	`setYscale()`	Sets the y-scale to be the default (between 0.0 and 1.0).
`void`	`setYscale(double min, double max)`	Sets the y-scale.
`void`	`show()`	Copies offscreen buffer to onscreen buffer.
`void`	`show(int t)`	已过时。 replaced by `enableDoubleBuffering()`, `show()`, and `pause(int t)`
`void`	`square(double x, double y, double halfLength)`	Draws a square of the specified size, centered at (x, y).
`void`	`text(double x, double y, java.lang.String text)`	Writes the given text string in the current font, centered at (x, y).
`void`	`text(double x, double y, java.lang.String text, double degrees)`	Writes the given text string in the current font, centered at (x, y) and rotated by the specified number of degrees.
`void`	`textLeft(double x, double y, java.lang.String text)`	Writes the given text string in the current font, left-aligned at (x, y).
`void`	`textRight(double x, double y, java.lang.String text)`	Writes the given text string in the current font, right-aligned at (x, y).
`void`	`xorOff()`	Turns off xor mode.
`void`	`xorOn()`	Turns on xor mode.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - BLACK
```
public static final java.awt.Color BLACK
```
    The color black.
  - BLUE
```
public static final java.awt.Color BLUE
```
    The color blue.
  - CYAN
```
public static final java.awt.Color CYAN
```
    The color cyan.
  - DARK_GRAY
```
public static final java.awt.Color DARK_GRAY
```
    The color dark gray.
  - GRAY
```
public static final java.awt.Color GRAY
```
    The color gray.
  - GREEN
```
public static final java.awt.Color GREEN
```
    The color green.
  - LIGHT_GRAY
```
public static final java.awt.Color LIGHT_GRAY
```
    The color light gray.
  - MAGENTA
```
public static final java.awt.Color MAGENTA
```
    The color magenta.
  - ORANGE
```
public static final java.awt.Color ORANGE
```
    The color orange.
  - PINK
```
public static final java.awt.Color PINK
```
    The color pink.
  - RED
```
public static final java.awt.Color RED
```
    The color red.
  - WHITE
```
public static final java.awt.Color WHITE
```
    The color white.
  - YELLOW
```
public static final java.awt.Color YELLOW
```
    The color yellow.
  - BOOK_BLUE
```
public static final java.awt.Color BOOK_BLUE
```
    Shade of blue used in Introduction to Programming in Java. It is Pantone 300U. The RGB values are approximately (9, 90, 166).
  - BOOK_LIGHT_BLUE
```
public static final java.awt.Color BOOK_LIGHT_BLUE
```
    Shade of light blue used in Introduction to Programming in Java. The RGB values are approximately (103, 198, 243).
  - BOOK_RED
```
public static final java.awt.Color BOOK_RED
```
    Shade of red used in Algorithms, 4th edition. It is Pantone 1805U. The RGB values are approximately (150, 35, 31).
  - PRINCETON_ORANGE
```
public static final java.awt.Color PRINCETON_ORANGE
```
    Shade of orange used in Princeton's identity. It is PMS 158. The RGB values are approximately (245, 128, 37).
- 构造器详细资料
  - Draw
```
public Draw(java.lang.String name)
```
    Initializes an empty drawing object with the given name.
    
    参数:
    
    name - the title of the drawing window.
  - Draw
```
public Draw()
```
    Initializes an empty drawing object.
- 方法详细资料
  - setLocationOnScreen
```
public void setLocationOnScreen(int x,
                                int y)
```
    Sets the upper-left hand corner of the drawing window to be (x, y), where (0, 0) is upper left.
    
    参数:
    
    x - the number of pixels from the left
    
    y - the number of pixels from the top
    
    抛出:
    
    java.lang.IllegalArgumentException - if the width or height is 0 or negative
  - setDefaultCloseOperation
```
public void setDefaultCloseOperation(int value)
```
    Sets the default close operation.
    
    参数:
    
    value - the value, typically JFrame.EXIT_ON_CLOSE (close all windows) or JFrame.DISPOSE_ON_CLOSE (close current window)
  - setCanvasSize
```
public void setCanvasSize(int canvasWidth,
                          int canvasHeight)
```
    Sets the canvas (drawing area) to be width-by-height pixels. This also erases the current drawing and resets the coordinate system, pen radius, pen color, and font back to their default values. Ordinarly, this method is called once, at the very beginning of a program.
    
    参数:
    
    canvasWidth - the width as a number of pixels
    
    canvasHeight - the height as a number of pixels
    
    抛出:
    
    java.lang.IllegalArgumentException - unless both canvasWidth and canvasHeight are positive
  - setXscale
```
public void setXscale()
```
    Sets the x-scale to be the default (between 0.0 and 1.0).
  - setYscale
```
public void setYscale()
```
    Sets the y-scale to be the default (between 0.0 and 1.0).
  - setXscale
```
public void setXscale(double min,
                      double max)
```
    Sets the x-scale.
    
    参数:
    
    min - the minimum value of the x-scale
    
    max - the maximum value of the x-scale
    
    抛出:
    
    java.lang.IllegalArgumentException - if (max == min)
    
    java.lang.IllegalArgumentException - if either min or max is either NaN or infinite
  - setYscale
```
public void setYscale(double min,
                      double max)
```
    Sets the y-scale.
    
    参数:
    
    min - the minimum value of the y-scale
    
    max - the maximum value of the y-scale
    
    抛出:
    
    java.lang.IllegalArgumentException - if (max == min)
    
    java.lang.IllegalArgumentException - if either min or max is either NaN or infinite
  - clear
```
public void clear()
```
    Clears the screen to the default color (white).
  - clear
```
public void clear(java.awt.Color color)
```
    Clears the screen to the given color.
    
    参数:
    
    color - the color to make the background
    
    抛出:
    
    java.lang.IllegalArgumentException - if color is null
  - getPenRadius
```
public double getPenRadius()
```
    Gets the current pen radius.
    
    返回:
    
    the current pen radius
  - setPenRadius
```
public void setPenRadius()
```
    Sets the pen size to the default (.002).
  - setPenRadius
```
public void setPenRadius(double radius)
```
    Sets the radius of the pen to the given size.
    
    参数:
    
    radius - the radius of the pen
    
    抛出:
    
    java.lang.IllegalArgumentException - if radius is negative, NaN, or infinite
  - getPenColor
```
public java.awt.Color getPenColor()
```
    Gets the current pen color.
    
    返回:
    
    the current pen color
  - setPenColor
```
public void setPenColor()
```
    Sets the pen color to the default color (black).
  - setPenColor
```
public void setPenColor(java.awt.Color color)
```
    Sets the pen color to the given color.
    
    参数:
    
    color - the color to make the pen
    
    抛出:
    
    java.lang.IllegalArgumentException - if color is null
  - setPenColor
```
public void setPenColor(int red,
                        int green,
                        int blue)
```
    Sets the pen color to the given RGB color.
    
    参数:
    
    red - the amount of red (between 0 and 255)
    
    green - the amount of green (between 0 and 255)
    
    blue - the amount of blue (between 0 and 255)
    
    抛出:
    
    java.lang.IllegalArgumentException - if red, green, or blue is outside its prescribed range
  - xorOn
```
public void xorOn()
```
    Turns on xor mode.
  - xorOff
```
public void xorOff()
```
    Turns off xor mode.
  - getJLabel
```
public javax.swing.JLabel getJLabel()
```
    Gets the current JLabel for use in some other GUI.
    
    返回:
    
    the current JLabel
  - getFont
```
public java.awt.Font getFont()
```
    Gets the current font.
    
    返回:
    
    the current font
  - setFont
```
public void setFont()
```
    Sets the font to the default font (sans serif, 16 point).
  - setFont
```
public void setFont(java.awt.Font font)
```
    Sets the font to the given value.
    
    参数:
    
    font - the font
    
    抛出:
    
    java.lang.IllegalArgumentException - if font is null
  - line
```
public void line(double x0,
                 double y0,
                 double x1,
                 double y1)
```
    Draws a line from (x0, y0) to (x1, y1).
    
    参数:
    
    x0 - the x-coordinate of the starting point
    
    y0 - the y-coordinate of the starting point
    
    x1 - the x-coordinate of the destination point
    
    y1 - the y-coordinate of the destination point
    
    抛出:
    
    java.lang.IllegalArgumentException - if any coordinate is either NaN or infinite
  - point
```
public void point(double x,
                  double y)
```
    Draws a point at (x, y).
    
    参数:
    
    x - the x-coordinate of the point
    
    y - the y-coordinate of the point
    
    抛出:
    
    java.lang.IllegalArgumentException - if either x or y is either NaN or infinite
  - circle
```
public void circle(double x,
                   double y,
                   double radius)
```
    Draws a circle of the specified radius, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the circle
    
    y - the y-coordinate of the center of the circle
    
    radius - the radius of the circle
    
    抛出:
    
    java.lang.IllegalArgumentException - if radius is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - filledCircle
```
public void filledCircle(double x,
                         double y,
                         double radius)
```
    Draws a filled circle of the specified radius, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the circle
    
    y - the y-coordinate of the center of the circle
    
    radius - the radius of the circle
    
    抛出:
    
    java.lang.IllegalArgumentException - if radius is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - ellipse
```
public void ellipse(double x,
                    double y,
                    double semiMajorAxis,
                    double semiMinorAxis)
```
    Draws an ellipse with the specified semimajor and semiminor axes, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the ellipse
    
    y - the y-coordinate of the center of the ellipse
    
    semiMajorAxis - is the semimajor axis of the ellipse
    
    semiMinorAxis - is the semiminor axis of the ellipse
    
    抛出:
    
    java.lang.IllegalArgumentException - if either semiMajorAxis or semiMinorAxis is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - filledEllipse
```
public void filledEllipse(double x,
                          double y,
                          double semiMajorAxis,
                          double semiMinorAxis)
```
    Draws a filled ellipse with the specified semimajor and semiminor axes, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the ellipse
    
    y - the y-coordinate of the center of the ellipse
    
    semiMajorAxis - is the semimajor axis of the ellipse
    
    semiMinorAxis - is the semiminor axis of the ellipse
    
    抛出:
    
    java.lang.IllegalArgumentException - if either semiMajorAxis or semiMinorAxis is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - arc
```
public void arc(double x,
                double y,
                double radius,
                double angle1,
                double angle2)
```
    Draws a circular arc of the specified radius, centered at (x, y), from angle1 to angle2 (in degrees).
    
    参数:
    
    x - the x-coordinate of the center of the circle
    
    y - the y-coordinate of the center of the circle
    
    radius - the radius of the circle
    
    angle1 - the starting angle. 0 would mean an arc beginning at 3 o'clock.
    
    angle2 - the angle at the end of the arc. For example, if you want a 90 degree arc, then angle2 should be angle1 + 90.
    
    抛出:
    
    java.lang.IllegalArgumentException - if radius is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - square
```
public void square(double x,
                   double y,
                   double halfLength)
```
    Draws a square of the specified size, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the square
    
    y - the y-coordinate of the center of the square
    
    halfLength - one half the length of any side of the square
    
    抛出:
    
    java.lang.IllegalArgumentException - if halfLength is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - filledSquare
```
public void filledSquare(double x,
                         double y,
                         double halfLength)
```
    Draws a square of the specified size, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the square
    
    y - the y-coordinate of the center of the square
    
    halfLength - one half the length of any side of the square
    
    抛出:
    
    java.lang.IllegalArgumentException - if halfLength is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - rectangle
```
public void rectangle(double x,
                      double y,
                      double halfWidth,
                      double halfHeight)
```
    Draws a rectangle of the specified size, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the rectangle
    
    y - the y-coordinate of the center of the rectangle
    
    halfWidth - one half the width of the rectangle
    
    halfHeight - one half the height of the rectangle
    
    抛出:
    
    java.lang.IllegalArgumentException - if either halfWidth or halfHeight is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - filledRectangle
```
public void filledRectangle(double x,
                            double y,
                            double halfWidth,
                            double halfHeight)
```
    Draws a filled rectangle of the specified size, centered at (x, y).
    
    参数:
    
    x - the x-coordinate of the center of the rectangle
    
    y - the y-coordinate of the center of the rectangle
    
    halfWidth - one half the width of the rectangle
    
    halfHeight - one half the height of the rectangle
    
    抛出:
    
    java.lang.IllegalArgumentException - if either halfWidth or halfHeight is negative
    
    java.lang.IllegalArgumentException - if any argument is either NaN or infinite
  - polygon
```
public void polygon(double[] x,
                    double[] y)
```
    Draws a polygon with the vertices (x₀, y₀), (x₁, y₁), ..., (x_n–1, y_n–1).
    
    参数:
    
    x - an array of all the x-coordinates of the polygon
    
    y - an array of all the y-coordinates of the polygon
    
    抛出:
    
    java.lang.IllegalArgumentException - unless x[] and y[] are of the same length
    
    java.lang.IllegalArgumentException - if any coordinate is either NaN or infinite
    
    java.lang.IllegalArgumentException - if either x[] or y[] is null
  - filledPolygon
```
public void filledPolygon(double[] x,
                          double[] y)
```
    Draws a filled polygon with the vertices (x₀, y₀), (x₁, y₁), ..., (x_n–1, y_n–1).
    
    参数:
    
    x - an array of all the x-coordinates of the polygon
    
    y - an array of all the y-coordinates of the polygon
    
    抛出:
    
    java.lang.IllegalArgumentException - unless x[] and y[] are of the same length
    
    java.lang.IllegalArgumentException - if any coordinate is either NaN or infinite
    
    java.lang.IllegalArgumentException - if either x[] or y[] is null
  - picture
```
public void picture(double x,
                    double y,
                    java.lang.String filename)
```
    Draws the specified image centered at (x, y). The supported image formats are JPEG, PNG, and GIF. As an optimization, the picture is cached, so there is no performance penalty for redrawing the same image multiple times (e.g., in an animation). However, if you change the picture file after drawing it, subsequent calls will draw the original picture.
    
    参数:
    
    x - the center x-coordinate of the image
    
    y - the center y-coordinate of the image
    
    filename - the name of the image/picture, e.g., "ball.gif"
    
    抛出:
    
    java.lang.IllegalArgumentException - if the image filename is invalid
    
    java.lang.IllegalArgumentException - if either x or y is either NaN or infinite
  - picture
```
public void picture(double x,
                    double y,
                    java.lang.String filename,
                    double degrees)
```
    Draws the specified image centered at (x, y), rotated given number of degrees. The supported image formats are JPEG, PNG, and GIF.
    
    参数:
    
    x - the center x-coordinate of the image
    
    y - the center y-coordinate of the image
    
    filename - the name of the image/picture, e.g., "ball.gif"
    
    degrees - is the number of degrees to rotate counterclockwise
    
    抛出:
    
    java.lang.IllegalArgumentException - if the image filename is invalid
    
    java.lang.IllegalArgumentException - if x, y, degrees is NaN or infinite
    
    java.lang.IllegalArgumentException - if filename is null
  - picture
```
public void picture(double x,
                    double y,
                    java.lang.String filename,
                    double scaledWidth,
                    double scaledHeight)
```
    Draws the specified image centered at (x, y), rescaled to the specified bounding box. The supported image formats are JPEG, PNG, and GIF.
    
    参数:
    
    x - the center x-coordinate of the image
    
    y - the center y-coordinate of the image
    
    filename - the name of the image/picture, e.g., "ball.gif"
    
    scaledWidth - the width of the scaled image (in screen coordinates)
    
    scaledHeight - the height of the scaled image (in screen coordinates)
    
    抛出:
    
    java.lang.IllegalArgumentException - if either scaledWidth or scaledHeight is negative
    
    java.lang.IllegalArgumentException - if the image filename is invalid
    
    java.lang.IllegalArgumentException - if x or y is either NaN or infinite
    
    java.lang.IllegalArgumentException - if filename is null
  - picture
```
public void picture(double x,
                    double y,
                    java.lang.String filename,
                    double scaledWidth,
                    double scaledHeight,
                    double degrees)
```
    Draws the specified image centered at (x, y), rotated given number of degrees, and rescaled to the specified bounding box. The supported image formats are JPEG, PNG, and GIF.
    
    参数:
    
    x - the center x-coordinate of the image
    
    y - the center y-coordinate of the image
    
    filename - the name of the image/picture, e.g., "ball.gif"
    
    scaledWidth - the width of the scaled image (in screen coordinates)
    
    scaledHeight - the height of the scaled image (in screen coordinates)
    
    degrees - is the number of degrees to rotate counterclockwise
    
    抛出:
    
    java.lang.IllegalArgumentException - if either scaledWidth or scaledHeight is negative
    
    java.lang.IllegalArgumentException - if the image filename is invalid
  - text
```
public void text(double x,
                 double y,
                 java.lang.String text)
```
    Writes the given text string in the current font, centered at (x, y).
    
    参数:
    
    x - the center x-coordinate of the text
    
    y - the center y-coordinate of the text
    
    text - the text to write
    
    抛出:
    
    java.lang.IllegalArgumentException - if text is null
    
    java.lang.IllegalArgumentException - if x or y is either NaN or infinite
  - text
```
public void text(double x,
                 double y,
                 java.lang.String text,
                 double degrees)
```
    Writes the given text string in the current font, centered at (x, y) and rotated by the specified number of degrees.
    
    参数:
    
    x - the center x-coordinate of the text
    
    y - the center y-coordinate of the text
    
    text - the text to write
    
    degrees - is the number of degrees to rotate counterclockwise
    
    抛出:
    
    java.lang.IllegalArgumentException - if text is null
    
    java.lang.IllegalArgumentException - if x, y, or degrees is either NaN or infinite
  - textLeft
```
public void textLeft(double x,
                     double y,
                     java.lang.String text)
```
    Writes the given text string in the current font, left-aligned at (x, y).
    
    参数:
    
    x - the x-coordinate of the text
    
    y - the y-coordinate of the text
    
    text - the text
    
    抛出:
    
    java.lang.IllegalArgumentException - if text is null
    
    java.lang.IllegalArgumentException - if x or y is either NaN or infinite
  - textRight
```
public void textRight(double x,
                      double y,
                      java.lang.String text)
```
    Writes the given text string in the current font, right-aligned at (x, y).
    
    参数:
    
    x - the x-coordinate of the text
    
    y - the y-coordinate of the text
    
    text - the text to write
    
    抛出:
    
    java.lang.IllegalArgumentException - if text is null
    
    java.lang.IllegalArgumentException - if x or y is either NaN or infinite
  - show
```
@Deprecated
public void show(int t)
```
    已过时。
    replaced by enableDoubleBuffering(), show(), and pause(int t)
    
    Copies the offscreen buffer to the onscreen buffer, pauses for t milliseconds and enables double buffering.
    
    参数:
    
    t - number of milliseconds
  - pause
```
public void pause(int t)
```
    Pause for t milliseconds. This method is intended to support computer animations.
    
    参数:
    
    t - number of milliseconds
  - show
```
public void show()
```
    Copies offscreen buffer to onscreen buffer. There is no reason to call this method unless double buffering is enabled.
  - enableDoubleBuffering
```
public void enableDoubleBuffering()
```
    Enable double buffering. All subsequent calls to drawing methods such as line(), circle(), and square() will be deferred until the next call to show(). Useful for animations.
  - disableDoubleBuffering
```
public void disableDoubleBuffering()
```
    Disable double buffering. All subsequent calls to drawing methods such as line(), circle(), and square() will be displayed on screen when called. This is the default.
  - save
```
public void save(java.lang.String filename)
```
    Saves the drawing to using the specified filename. The supported image formats are JPEG and PNG; the filename suffix must be .jpg or .png.
    
    参数:
    
    filename - the name of the file with one of the required suffixes
    
    抛出:
    
    java.lang.IllegalArgumentException - if filename is null
  - actionPerformed
```
public void actionPerformed(java.awt.event.ActionEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    actionPerformed 在接口中 java.awt.event.ActionListener
  - addListener
```
public void addListener(DrawListener listener)
```
    Adds a DrawListener to listen to keyboard and mouse events.
    
    参数:
    
    listener - the {\tt DrawListener} argument
  - isMousePressed
```
public boolean isMousePressed()
```
    Returns true if the mouse is being pressed.
    
    返回:
    
    true if the mouse is being pressed; false otherwise
  - mousePressed
```
@Deprecated
public boolean mousePressed()
```
    已过时。
    replaced by isMousePressed()
    
    Returns true if the mouse is being pressed.
    
    返回:
    
    true if the mouse is being pressed; false otherwise
  - mouseX
```
public double mouseX()
```
    Returns the x-coordinate of the mouse.
    
    返回:
    
    the x-coordinate of the mouse
  - mouseY
```
public double mouseY()
```
    Returns the y-coordinate of the mouse.
    
    返回:
    
    the y-coordinate of the mouse
  - mouseEntered
```
public void mouseEntered(java.awt.event.MouseEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    mouseEntered 在接口中 java.awt.event.MouseListener
  - mouseExited
```
public void mouseExited(java.awt.event.MouseEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    mouseExited 在接口中 java.awt.event.MouseListener
  - mousePressed
```
public void mousePressed(java.awt.event.MouseEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    mousePressed 在接口中 java.awt.event.MouseListener
  - mouseReleased
```
public void mouseReleased(java.awt.event.MouseEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    mouseReleased 在接口中 java.awt.event.MouseListener
  - mouseClicked
```
public void mouseClicked(java.awt.event.MouseEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    mouseClicked 在接口中 java.awt.event.MouseListener
  - mouseDragged
```
public void mouseDragged(java.awt.event.MouseEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    mouseDragged 在接口中 java.awt.event.MouseMotionListener
  - mouseMoved
```
public void mouseMoved(java.awt.event.MouseEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    mouseMoved 在接口中 java.awt.event.MouseMotionListener
  - hasNextKeyTyped
```
public boolean hasNextKeyTyped()
```
    Returns true if the user has typed a key.
    
    返回:
    
    true if the user has typed a key; false otherwise
  - nextKeyTyped
```
public char nextKeyTyped()
```
    The next key typed by the user.
    
    返回:
    
    the next key typed by the user
  - isKeyPressed
```
public boolean isKeyPressed(int keycode)
```
    Returns true if the keycode is being pressed.
    This method takes as an argument the keycode (corresponding to a physical key). It can handle action keys (such as F1 and arrow keys) and modifier keys (such as shift and control). See KeyEvent for a description of key codes.
    
    参数:
    
    keycode - the keycode to check
    
    返回:
    
    true if keycode is currently being pressed; false otherwise
  - keyTyped
```
public void keyTyped(java.awt.event.KeyEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    keyTyped 在接口中 java.awt.event.KeyListener
  - keyPressed
```
public void keyPressed(java.awt.event.KeyEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    keyPressed 在接口中 java.awt.event.KeyListener
  - keyReleased
```
public void keyReleased(java.awt.event.KeyEvent e)
```
    This method cannot be called directly.
    
    指定者:
    
    keyReleased 在接口中 java.awt.event.KeyListener
  - main
```
public static void main(java.lang.String[] args)
```
    Test client.
    
    参数:
    
    args - the command-line arguments

构造器	说明
`Draw()`	Initializes an empty drawing object.
`Draw(java.lang.String name)`	Initializes an empty drawing object with the given name.

类 Draw

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

BLACK

BLUE

CYAN

DARK_GRAY

GRAY

GREEN

LIGHT_GRAY

MAGENTA

ORANGE

PINK

RED

WHITE

YELLOW

BOOK_BLUE

BOOK_LIGHT_BLUE

BOOK_RED

PRINCETON_ORANGE

构造器详细资料

Draw

Draw

方法详细资料

setLocationOnScreen

setDefaultCloseOperation

setCanvasSize

setXscale

setYscale

setXscale

setYscale

clear

clear

getPenRadius

setPenRadius

setPenRadius

getPenColor

setPenColor

setPenColor

setPenColor

xorOn

xorOff

getJLabel

getFont

setFont

setFont

line

point

circle

filledCircle

ellipse

filledEllipse

arc

square

filledSquare

rectangle

filledRectangle

polygon

filledPolygon

picture

picture

picture

picture

text

text

textLeft

textRight

show

pause

show

enableDoubleBuffering

disableDoubleBuffering

save

actionPerformed

addListener

isMousePressed

mousePressed