```
public class Canvas
extends Object
```
Canvas is a class to allow for simple graphical drawing on a canvas. This is a modification of the general purpose Canvas, specially made for the BlueJ "shapes" example.

Version:

2016.02.29

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`draw(Object referenceObject, String color, Shape shape)`	Draw a given shape onto the canvas.
`void`	`erase(Object referenceObject)`	Erase a given shape's from the screen.
`static Canvas`	`getCanvas()`	Factory method to get the canvas singleton object.
`void`	`setForegroundColor(String colorString)`	Set the foreground color of the Canvas.
`void`	`setVisible(boolean visible)`	Set the canvas visibility and brings canvas to the front of screen when made visible.
`void`	`wait(int milliseconds)`	Wait for a specified number of milliseconds before finishing.

Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - getCanvas
```
public static Canvas getCanvas()
```
    Factory method to get the canvas singleton object.
  - setVisible
```
public void setVisible(boolean visible)
```
    Set the canvas visibility and brings canvas to the front of screen when made visible. This method can also be used to bring an already visible canvas to the front of other windows.
    
    Parameters:
    
    visible - boolean value representing the desired visibility of the canvas (true or false)
  - draw
```
public void draw(Object referenceObject,
                 String color,
                 Shape shape)
```
    Draw a given shape onto the canvas.
    
    Parameters:
    
    referenceObject - an object to define identity for this shape
    
    color - the color of the shape
    
    shape - the shape object to be drawn on the canvas
  - erase
```
public void erase(Object referenceObject)
```
    Erase a given shape's from the screen.
    
    Parameters:
    
    referenceObject - the shape object to be erased
  - setForegroundColor
```
public void setForegroundColor(String colorString)
```
    Set the foreground color of the Canvas.
    
    Parameters:
    
    newColor - the new color for the foreground of the Canvas
  - wait
```
public void wait(int milliseconds)
```
    Wait for a specified number of milliseconds before finishing. This provides an easy way to specify a small delay which can be used when producing animations.
    
    Parameters:
    
    milliseconds - the number

Class Canvas

Method Summary

Methods inherited from class java.lang.Object

Method Detail

getCanvas

setVisible

draw

erase

setForegroundColor

wait