Class MainCanvas 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----MainCanvas
public class MainCanvas
extends Canvas
A subclass of Canvas the implements the main drawing area of "What's In A Line?".

Variable Index

o ARROW_LENGTH
o ARROW_WIDTH
o BOARDER
o CIRCLE_MODE
o DRAG_BOTH
o DRAG_NONE
o DRAG_P1
o DRAG_P2
o GRAB_RADIUS
o LINE_MODE

Constructor Index

o MainCanvas(AwtFrame)
Class constructor.

Method Index

o drawLine(int, int, int, int)
Draw a line a line in the current color in MainCanvas coordinates.
o drawPrimitive(Point, Point)
Draw a reconing primitive (line or circle) based on the two inputs.
o drawString(String, int, int)
Draws the specified string at the specified MainCanvas coordinates.
o handleEvent(Event)
Handle the mouse events associated with drawing in the MainCanvas.
o minimumSize()
Returns the minimum size of MainCanvas.
o paint(Graphics)
Paint the canvas including the cartesian coordinates, primitives and any rendered pixels.
o preferredSize()
Returns the preferred size of MainCanvas.
o redrawPixels()
Redraw all the currently active pixels.
o resetDrawing()
Remove all drawn pixels from the MainCanvas.
o setCircleMode()
Set the primitive drawing mode to CIRCLE_MODE.
o setCircleValues(Point, Point)
Set circle parameters c (center) and r (radius) in CIRCLE_MODE.
o setLineEndPoints(Point, Point)
Set the line endpoints p1 and p2 in LINE_MODE.
o setLineMode()
Set the primitive drawing mode to LINE_MODE.
o writePixel(Point, float)
Write a pixel of the specified color at the specified location.

Variables

o LINE_MODE 
 public static final int LINE_MODE
o CIRCLE_MODE 
 public static final int CIRCLE_MODE
o BOARDER 
 public static final int BOARDER
o ARROW_LENGTH 
 public static final int ARROW_LENGTH
o ARROW_WIDTH 
 public static final int ARROW_WIDTH
o GRAB_RADIUS 
 public static final int GRAB_RADIUS
o DRAG_NONE 
 public static final int DRAG_NONE
o DRAG_P1 
 public static final int DRAG_P1
o DRAG_P2 
 public static final int DRAG_P2
o DRAG_BOTH 
 public static final int DRAG_BOTH

Constructors

o MainCanvas 
 public MainCanvas(AwtFrame f)
Class constructor.

Methods

o paint 
 public void paint(Graphics g)
Paint the canvas including the cartesian coordinates, primitives and any rendered pixels.

Overrides:
paint in class Canvas
o drawPrimitive 
 public void drawPrimitive(Point p1,
                           Point p2)
Draw a reconing primitive (line or circle) based on the two inputs.

o drawLine 
 public void drawLine(int x1,
                      int y1,
                      int x2,
                      int y2)
Draw a line a line in the current color in MainCanvas coordinates.

o drawString 
 public void drawString(String str,
                        int x,
                        int y)
Draws the specified string at the specified MainCanvas coordinates.

o handleEvent 
 public boolean handleEvent(Event event)
Handle the mouse events associated with drawing in the MainCanvas.

Overrides:
handleEvent in class Component
o setLineMode 
 public void setLineMode()
Set the primitive drawing mode to LINE_MODE.

o setCircleMode 
 public void setCircleMode()
Set the primitive drawing mode to CIRCLE_MODE.

o setLineEndPoints 
 public void setLineEndPoints(Point p1,
                              Point p2)
Set the line endpoints p1 and p2 in LINE_MODE.

o setCircleValues 
 public void setCircleValues(Point p1,
                             Point p2)
Set circle parameters c (center) and r (radius) in CIRCLE_MODE.

o writePixel 
 public void writePixel(Point p,
                        float value)
Write a pixel of the specified color at the specified location.

o resetDrawing 
 public void resetDrawing()
Remove all drawn pixels from the MainCanvas.

o preferredSize 
 public Dimension preferredSize()
Returns the preferred size of MainCanvas.

Overrides:
preferredSize in class Component
o minimumSize 
 public Dimension minimumSize()
Returns the minimum size of MainCanvas.

Overrides:
minimumSize in class Component
o redrawPixels 
 public void redrawPixels()
Redraw all the currently active pixels.