: Class DrawingCanvas

galapagos
Class DrawingCanvas

public class DrawingCanvas
extends java.awt.Canvas

Generic Canvas descendant object for drawing lines. This object does not have any intelligence or memory. This object can have zero or more drawers who will be notified when the component refeshing is needed. This object will pass the Graphics object to the associated DrawingController objects. The notified controllers can then draw whatever they want on the passed Graphics object.

See Also:: Serialized Form

Field Summary

protected int EMPTY
          A class constant for denoting an empty list.

Constructor Summary

DrawingCanvas()
          A default constructor that creates an instance of the PlottingCanvas class.

Method Summary

void addOwner(galapagos.DrawingController owner)
          A mutator method that adds another DrawingController that will draw its trajectory on this canvas.

void clear()
          Erases the current contents of the PlottingCanvas by painting the whole canvas with the background color.

void drawPolygon(java.awt.Graphics g, java.awt.Polygon polygon, java.awt.Color color)


void init()
          Initializes the necessary objects for double-buffering drawing.

void paint(java.awt.Graphics g)
          Painting of the canvas is done by drawing the whole contents using the double-buffering technique.

void plot(java.awt.Graphics graphic, java.awt.Color color, double size, galapagos.Position pt1, galapagos.Position pt2)
          Draws a line between two points pt1 and pt2 on the parameter graphic.

void setGrid(boolean showGrid)
          A mutator method that sets the flag for drawing the grid lines.

void setOrigin(int x, int y)
          A mutator method that sets the origin point.

void setUnit(double pixelsPerUnit)
          A mutator method that sets the scaling factor.

void update(java.awt.Graphics g)

Field Summary
`protected int`	`EMPTY` A class constant for denoting an empty list.

Constructor Summary
`DrawingCanvas()` A default constructor that creates an instance of the PlottingCanvas class.

Method Summary
`void`	`addOwner(galapagos.DrawingController owner)` A mutator method that adds another DrawingController that will draw its trajectory on this canvas.
`void`	`clear()` Erases the current contents of the PlottingCanvas by painting the whole canvas with the background color.
`void`	`drawPolygon(java.awt.Graphics g, java.awt.Polygon polygon, java.awt.Color color)`
`void`	`init()` Initializes the necessary objects for double-buffering drawing.
`void`	`paint(java.awt.Graphics g)` Painting of the canvas is done by drawing the whole contents using the double-buffering technique.
`void`	`plot(java.awt.Graphics graphic, java.awt.Color color, double size, galapagos.Position pt1, galapagos.Position pt2)` Draws a line between two points pt1 and pt2 on the parameter graphic.
`void`	`setGrid(boolean showGrid)` A mutator method that sets the flag for drawing the grid lines.
`void`	`setOrigin(int x, int y)` A mutator method that sets the origin point.
`void`	`setUnit(double pixelsPerUnit)` A mutator method that sets the scaling factor.
`void`	`update(java.awt.Graphics g)`

galapagos Class DrawingCanvas

galapagos
Class DrawingCanvas