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Class graphing.ZoomGraphWindow 

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Canvas
                   |
                   +----graphing.GraphWindow
                           |
                           +----graphing.ZoomGraphWindow
public class ZoomGraphWindow
extends GraphWindow
A ZoomGraphWindow is a GraphWindow together with methods to change scale easily (zooming in and zooming out). The mouse draws out a rubber band on the screen and doZoomToBox() snaps the viewing rectangle to this box.

Variable Index

o bandColor
The color of the rubber band

Constructor Index

o ZoomGraphWindow()
o ZoomGraphWindow(double, double, double, double)
Constructs a ZoomGraphWindow with the specified ranges of x and y axes.
o ZoomGraphWindow(double, double, double, double, double, double)
Constructs a ZoomGraphWindow with the specified ranges of x and y axes.

Method Index

o bandIsVisible()
o deleteBand()
o doZoomIn()
Zooms the viewing rectangle in on the center of the screen.
o doZoomOut()
Pulls the viewing rectangle back out of the center of the screen.
o doZoomToBox()
Snaps the viewing rectangle to the rubber band drawn out by the mouse.
o drawGraph(double, double, double, double, double, double)
Overrides the drawGraph() method of GraphWindow.
o lostFocus(Event, Object)
When we loose focus, the rubber band vanishes.
o mouseDown(Event, int, int)
o mouseDrag(Event, int, int)
o mouseUp(Event, int, int)
o paint(Graphics)
o selects(int, int)
Tells whether the point (x,y) is inside the region selected by the rubber band
o update(Graphics)
This class overrides Component.update() to reduce flicker

Variables

o bandColor 
  public Color bandColor
The color of the rubber band

Constructors

o ZoomGraphWindow 
  public ZoomGraphWindow(double xMin,
                         double xMax,
                         double xScale,
                         double yMin,
                         double yMax,
                         double yScale)
Constructs a ZoomGraphWindow with the specified ranges of x and y axes. The axes show tickmarks separated by xScale and yScale.

o ZoomGraphWindow 
  public ZoomGraphWindow(double xMin,
                         double xMax,
                         double yMin,
                         double yMax)
Constructs a ZoomGraphWindow with the specified ranges of x and y axes. The axes show no tickmarks.

o ZoomGraphWindow 
  public ZoomGraphWindow()

Methods

o update 
  public void update(Graphics g)
This class overrides Component.update() to reduce flicker

Overrides:
update in class Component
o paint 
  public void paint(Graphics g)
Overrides:
paint in class GraphWindow
o drawGraph 
  public void drawGraph(double xMin,
                        double xMax,
                        double xScale,
                        double yMin,
                        double yMax,
                        double yScale)
Overrides the drawGraph() method of GraphWindow.

Overrides:
drawGraph in class GraphWindow
o selects 
  public boolean selects(int x,
                         int y)
Tells whether the point (x,y) is inside the region selected by the rubber band

o mouseDown 
  public boolean mouseDown(Event e,
                           int x,
                           int y)
Overrides:
mouseDown in class Component
o mouseDrag 
  public boolean mouseDrag(Event e,
                           int x,
                           int y)
Overrides:
mouseDrag in class Component
o mouseUp 
  public boolean mouseUp(Event e,
                         int x,
                         int y)
Overrides:
mouseUp in class Component
o lostFocus 
  public boolean lostFocus(Event e,
                           Object w)
When we loose focus, the rubber band vanishes. But the window will still be primed for doZoomToBox() if zoomActive is set.

Overrides:
lostFocus in class Component
o bandIsVisible 
  public boolean bandIsVisible()
o deleteBand 
  public void deleteBand()
o doZoomIn 
  public void doZoomIn()
Zooms the viewing rectangle in on the center of the screen.

o doZoomToBox 
  public void doZoomToBox()
Snaps the viewing rectangle to the rubber band drawn out by the mouse.

o doZoomOut 
  public void doZoomOut()
Pulls the viewing rectangle back out of the center of the screen. 

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