DRAWINGTOOL
CLASS SPECIFICATIONS
These classes are not
part of Java but are available through the library named apcslib. You must have the file apcslib.jar in the appropriate
directory where Java can access it. To
have these classes available in your program, use this command:
import apcslib.*;
Other features of apcslib
will be covered in later lessons.
DrawingTool |
protected
double protected xPos protected yPos protected
direction; protected int
width; protected
boolean isDown; protected Color
color; ... |
<<constructors>> DrawingTool() DrawingTool(SketchPad) ... <<accessors>> public
Color getColor() public
double getDirection() public
Point2D.Double getPosition() public
int getWidth() public
String toString() <<modifiers>> public
void backward(double) public
void down() public
void drawString(String) public void drawCircle(double) public
void forward(double) public
void home() public
void move(double) public
void move(double, double) public
void setColor(Color) public
void setDirection(double) public
void setWidth(int) public
String toString() public
void turn (double) public
void turnLeft(double) public
void turnRight(double) public void up() ... |
A DrawingTool object
·
Appears in a SketchPad
Window (this window is 250 pixels wide and 250 pixels high initially, but
can be constructed with different dimensions.)
·
The origin (0, 0) is at
the center of the drawing window.
·
Is directed either up,
down, left, or right.
·
Is either in drawing mode
or in moving mode.
public
DrawingTool()
postcondition
·
A new DrawingTool is created and placed in the center (0, 0) of a SketchPad window that is 250
pixels wide and 250 pixels high.
·
This object is set to
drawing mode.
·
The direction for this
object is up (90º).
·
The DrawingTool color is
set to blue.
·
The DrawingTool width is
1.
public DrawingTool(SketchPad
win)
postcondition
·
A new DrawingTool is created and placed in the center (0, 0) of the SketchPad window win.
·
This object is set to
drawing mode.
·
The direction for this
object is up (90º).
·
The DrawingTool color is
set to blue.
·
The DrawingTool width is
1.
public String toString();
postcondition
result = color
public Color getColor();
postcondition
result = color
public double getDirection();
postcondition
result = direction
public int getWidth();
postcondition
result = width
public backward (double
distance);
postcondition
·
This DrawingTool object is moved backward from current direction by distance pixels from the old
(previous) location.
·
If this object is in
drawing mode, a line segment is drawn across the distance path just traversed.
·
The direction is
unchanged.
·
A 0.5 second delay occurs
following this method’s execution.
public void down();
postcondition
·
This object is set to
drawing mode.
public drawString(String
text);
postcondition
·
The string text is drawn at the current location using the current color.
public drawCircle
(double r);
postcondition
·
If the object is in
drawing mode, a circle of radius r is drawn around the
current location using the current width and color.
public forward(double
distance);
postcondition
·
This DrawingTool object is moved in the current direction by distance pixels from the old
(previous) location.
·
If this object is in
drawing mode, a line segment is drawn across the distance path just traversed.
·
A 0.5 second delay occurs
following this method’s execution.
public home();
postcondition
·
The location of the DrawingTool object is set to the center of the SketchPad window.
·
The drawing direction of
the object is ups.
public move(double d);
postcondition
·
This DrawingTool object is moved in the current direction by d pixels from the old
(previous) location.
·
If this object is in
drawing mode, a line segment is drawn across the d path just traversed.
public move(double x,
double y);
postcondition
·
This DrawingTool object is moved from the current position to the position specified by
the coordinates x and y.
·
If this object is in
drawing mode, a line segment is drawn from the old (previous) position to
the absolute position specified by x and y.
public setColor(Color
c);
precondition
·
c is a valid Color
postcondition
·
The color of the DrawingTool object is set to c.
public setDirection(double
d);
postcondition
·
Sets the direction to d degrees. The orientation is d degrees counterclockwise
from the positive x-axis
public setWidth(int w);
precondition
·
w is >= 1
postcondition
·
The width of the DrawingTool object is set to w pixels.
public turn(double d);
postcondition
·
Changes the current
direction counterclockwise by d degrees from the current
direction.
public turnLeft(double
degrees);
postcondition
·
Changes the current
direction counterclockwise by d degrees from the current
direction.
public turnRight(double
degrees);
postcondition
·
Changes the current
direction clockwise by d degrees from the current
direction.
public up();
postcondition
·
This object is set to
moving mode.