edu.hws.jcm.draw
Class Crosshair

java.lang.Object
  edu.hws.jcm.draw.Drawable
      edu.hws.jcm.draw.DrawGeometric
          edu.hws.jcm.draw.Crosshair

All Implemented Interfaces:

Computable, java.io.Serializable

public class Crosshair
extends DrawGeometric

A Crosshair is a small cross, 15 pixels wide and high, that is drawn in a CoordinateRect at a specified point. A Crosshair is a Computable object, so should be added to a Controller to be recomputed when the coordinates of the point change.

See Also:

Serialized Form

Field Summary

Fields inherited from class edu.hws.jcm.draw.DrawGeometric

a, b, c, color, CROSS, d, fillColor, h, INFINITE_LINE_ABSOLUTE, INFINITE_LINE_RELATIVE, LINE_ABSOLUTE, LINE_CENTERED, LINE_RELATIVE, lineWidth, OVAL_ABSOLUTE, OVAL_CENTERED, OVAL_RELATIVE, RECT_ABSOLUTE, RECT_CENTERED, RECT_RELATIVE, shape, v, x1, x2, y1, y2

Fields inherited from class edu.hws.jcm.draw.Drawable

canvas, coords

Constructor Summary

Crosshair(Value x, Function f)
Create a cross that appears on the graph of the function y=f(x) at the point with coordinates (x,f(x)).

Crosshair(Value x, Value y)
Create a cross that appears at the point with coordinates (x,y).

Method Summary

Methods inherited from class edu.hws.jcm.draw.DrawGeometric

compute, draw, getColor, getFillColor, getH, getLineWidth, getV, getX1, getX2, getY1, getY2, setColor, setFillColor, setH, setLineWidth, setPoints, setPoints, setShape, setV, setX1, setX2, setY1, setY2

Methods inherited from class edu.hws.jcm.draw.Drawable

getVisible, needsRedraw, setOwnerData, setVisible

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Crosshair

public Crosshair(Value x,
                 Value y)

Create a cross that appears at the point with coordinates (x,y).

Crosshair

public Crosshair(Value x,
                 Function f)

Create a cross that appears on the graph of the function y=f(x) at the point with coordinates (x,f(x)). f should be a function of one variable.