Class GObject

This class is the common superclass of all graphical objects that can be displayed on a GWindow. Because it is an abstract class, you are not allowed to construct an object whose class is GObject directly. What you do instead is construct one of the concrete subclasses like GRect or GLine. The purpose of this class definition is to define methods that apply to all graphical objects regardless of their specific class.

contains(x, y)

Checks to see whether a point is contained in this object.

Usage:	if gcomp.contains(x, y):
Parameters:	x   The x-coordinate of the point being tested y   The y-coordinate of the point being tested
Returns:	True if the point (x, y) is inside the object, and False otherwise

 

getBounds()

Returns the bounding rectangle for this object.

Usage:	bounds = gcomp.getBounds()
Returns:	The bounding box for this object

 

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getColor()

Returns the color used to display this object.

Usage:	color = gobj.getColor()
Returns:	The color used to display this object

 

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getHeight()

Returns the height of this object, which is defined to be the height of the bounding box.

Usage:	height = gobj.getHeight()
Returns:	The height of this object on the screen

 

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getLineWidth()

Returns the width of the lines used to draw the object.

Usage:	width = gobj.getLineWidth()
Returns:	The line width in pixels

 

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getLocation()

Returns the location of this object as a GPoint.

Usage:	pt = gobj.getLocation()
Returns:	The location of this object as a GPoint

 

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getSize()

Returns the size of the bounding box for this object.

Usage:	size = gobj.getSize()
Returns:	The size of this object

 

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getWidth()

Returns the width of this object, which is defined to be the width of the bounding box.

Usage:	width = gobj.getWidth()
Returns:	The width of this object on the screen

 

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getX()

Returns the x-coordinate of the object.

Usage:	x = gobj.getX()
Returns:	The x-coordinate of the object

 

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getY()

Returns the y-coordinate of the object.

Usage:	y = gobj.getY()
Returns:	The y-coordinate of the object

 

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isVisible()

Checks to see whether this object is visible.

Usage:	if gobj.isVisible():
Returns:	True if the object is visible, otherwise False

 

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move(dx, dy)

Moves the object on the screen using the displacements dx and dy.

Usage:	gobj.move(dx, dy)
Parameters:	dx   The distance to move the object in the x direction (positive is rightward) dy   The distance to move the object in the y direction (positive is downward)

 

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movePolar(r, theta)

Moves the object using displacements given in polar coordinates. The parameter r specifies the distance to move and theta specifies the angle in which the motion occurs. The angle is measured in degrees increasing counterclockwise from the +x axis.

Usage:	gobj.movePolar(r, theta)
Parameters:	r   The distance to move theta   The angle in which to move, measured in degrees increasing counterclockwise from the +x axis

 

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rotate(theta)

Rotates the object on the screen theta degrees around its origin. Note: The rotate method is not yet implemented.

Usage:	gobj.rotate(theta)
Parameter:	theta   The angle of rotation in degrees counterclockwise

 

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scale(sf)

Scales the object on the screen by the scale factor sf, which applies in both dimensions. Note: The scale method is not yet implemented.

Usage:	gobj.scale(sf)
Parameter:	sf   The factor used to scale all coordinates in both dimensions

 

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sendBackward()

Moves this object one step toward the back in the z dimension. If it was already at the back of the stack, nothing happens.

Usage:

gobj.sendBackward()

 

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sendForward()

Moves this object one step toward the front in the z dimension. If it was already at the front of the stack, nothing happens.

Usage:

gobj.sendForward()

 

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sendToBack()

Moves this object to the back of the display in the z dimension. By moving it to the back, this object will appear to be behind the other graphical objects on the display and may be obscured by other objects in front.

Usage:

gobj.sendToBack()

 

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sendToFront()

Moves this object to the front of the display in the z dimension. By moving it to the front, this object will appear to be on top of the other graphical objects on the display and may hide any objects that are further back.

Usage:

gobj.sendToFront()

 

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setColor(color)

Sets the color of this object.

Usage:	gobj.setColor(color)
Parameter:	color   The color of this object

 

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setLineWidth(width)

Sets the width of the lines used to draw the object.

Usage:	gobj.setLineWidth(width)
Parameter:	width   The line width in pixels

 

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setLocation(x, y)

Sets the location of this object to the point (x, y).

Usage:	gobj.setLocation(x, y)
Parameters:	x   The new x-coordinate for the object y   The new y-coordinate for the object

 

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setVisible(flag)

Sets whether this object is visible.

Usage:	gobj.setVisible(visible)
Parameter:	visible   True to make the object visible, False to hide it

 

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