Class RiemannSumRects

java.lang.Object
edu.hws.jcm.draw.Drawable
edu.hws.jcm.draw.RiemannSumRects
All Implemented Interfaces:
Computable, Serializable

public class RiemannSumRects extends Drawable implements Computable
A RiemannSumRects calculates a Riemann sum for a function. It implements Computable and InputObject. You can specify and change the number of intervals in the sum, as well as the method used to calculate the sum. Functions exist to return Value objects for the sum using different computations. This class was written by Gabriel Weinstock, with some modifications by David Eck
See Also:
  • Field Details

    • LEFTENDPOINT

      public static final int LEFTENDPOINT
      Summation method type.
      See Also:
    • RIGHTENDPOINT

      public static final int RIGHTENDPOINT
      Summation method type.
      See Also:
    • MIDPOINT

      public static final int MIDPOINT
      Summation method type.
      See Also:
    • CIRCUMSCRIBED

      public static final int CIRCUMSCRIBED
      Summation method type.
      See Also:
    • INSCRIBED

      public static final int INSCRIBED
      Summation method type.
      See Also:
    • TRAPEZOID

      public static final int TRAPEZOID
      Summation method type.
      See Also:
    • CURRENT_METHOD

      public static final int CURRENT_METHOD
      For use in getValueObject(), to indicate whatever summation method is currently set for drawing.
      See Also:
  • Constructor Details

    • RiemannSumRects

      public RiemannSumRects()
      Construct a RiemannSumRects object that initially has nothing to draw and that is set up to use the default number of intervals, 5.
    • RiemannSumRects

      public RiemannSumRects(Function f, Value i)
      Construct a new RiemannSumRects object.
      Parameters:
      i - a Value object representing the number of intervals. If null, five intervals are used.
      f - a Function object used to derive the Riemann sum. If null, nothing is drawn.
  • Method Details

    • getColor

      public Color getColor()
      Get the current color used to draw the rectangles
    • setColor

      public void setColor(Color c)
      Set the color used to draw the rectangles. The default color is a light yellow.
    • setOutlineColor

      public void setOutlineColor(Color c)
      Set the color that will be used to draw outlines around the rects. If this is null, then no outlines are drawn. The default is a medium-dark red that looks brownish next to the default yellow fill color.
    • getOutlineColor

      public Color getOutlineColor()
      Get the color that is used to draw outlines around the rects. If this is null, then no outlines are drawn.
    • setFunction

      public void setFunction(Function func)
      Set the function whose Riemann sums are to be computed. If null, nothing is drawn. The function, if non-null, must have arity 1, or an IllegalArgumentException is thrown.
    • getFuction

      public Function getFuction()
      Returns the function whose Riemann sums are computed. Can be null.
    • setMethod

      public void setMethod(int m)
      Set the method used to calculate the rectangles.
      Parameters:
      m - can be: LEFTENDPOINT, RIGHTENDPOINT, MIDPOINT, CIRCUMSCRIBED, INSCRIBED or TRAPEZOID (these are integers ranging from 0 to 5, respectively)
    • getMethod

      public int getMethod()
      Return the current method used to find the rectangle sums
    • compute

      public void compute()
      This is generally called by a Controller. Indicates that all data should be recomputed because input values that the data depends on might have changed.
      Specified by:
      compute in interface Computable
    • getIntervalCount

      public Value getIntervalCount()
      Get the number of intervals used.
      Returns:
      a Value object representing the number of intervals
    • setIntervalCount

      public void setIntervalCount(Value c)
      Set the interval count (the RiemannSumRects will be redrawn after this function is called). The value will be clamped to be a value between 1 and 5000. If the value is null, the default number of intervals, five, is used.
      Parameters:
      c - a Value object representing the interval count
    • draw

      public void draw(Graphics g, boolean coordsChanged)
      Draw the Rieman sum rects. This is generally called by an object of class CoordinateRect
      Specified by:
      draw in class Drawable
      Parameters:
      g - The graphics context in which the Drawble is to be drawn. (The drawing can change the color in g, but should not permanently change font, painting mode, etc. Thus, every drawable is responsible for setting the color it wants to use.)
      coordsChanged - Indicates whether the CoordinateRect has changed.
    • getValueObject

      public Value getValueObject(int which)
      Gets a Value object that gives the value of the Riemann sum for the specified method.
      Parameters:
      which - integer stating the method used to derive the sum; one of the constants LEFTENDPOINT, RIGHTENDPOINT, MIDPOINT, CIRCUMSCRIBED, INSCRIBED, TRAPEZOID, or CURRENT_METHOD.
      Returns:
      a Value object representing the sum for the given method