Package edu.hws.jcm.draw
Class ParametricCurve
java.lang.Object
edu.hws.jcm.draw.Drawable
edu.hws.jcm.draw.ParametricCurve
- All Implemented Interfaces:
Computable
,Serializable
A ParametricCurve is defined by two functions, x(t) and y(t) of a variable, t,
for t in a specified interval. The curve is simply defined as a sequence of line
segments connecting points of the form (x(t),y(t)), except where one of the functions
is undefined. Also, in some cases a
discontinuity will be detected and no line will be drawn between two of the points.
- See Also:
-
Field Summary
-
Constructor Summary
ConstructorsConstructorDescriptionCreate a ParametricCurve with nothing to graph.ParametricCurve
(Function xFunc, Function yFunc) Create a parametric curve with x and y coordinates given by the specified functions of the parameter t.Create a parametric curve with the specified values. -
Method Summary
Modifier and TypeMethodDescriptionvoid
compute()
Recompute data for the graph and make sure that the area of the display canvas that shows the graph is redrawn.void
Draw the graph (possibly recomputing the data if the CoordinateRect has changed).getColor()
Get the color that is used to draw the graph.Get the value object, possibly null, that determines the number of points on the curve.getTMax()
Get the Value object, possibly null, that gives the right endpoint of the domain of the parameter.getTMin()
Get the Value object, possibly null, that gives the left endpoint of the domain of the parameter.Get the (possibly null) function that gives the x-coordinate of the curve.Get the (possibly null) function that gives the y-coordinate of the curve.void
Set the color to be used for drawing the graph.void
setFunctions
(Function x, Function y) Sets the functions that gives the coordinates of the curve to be graphed.void
setIntervals
(Value intervalCount) Specify the number of subintervals into which the domain of the parametric curve is divided.void
Set the Value objects that specify the domain of the paratmeter.void
Set the Value object that gives the right endpoint of the domain of the parameter.void
Set the Value object that gives the left endpoint of the domain of the parameter.void
Set the function that gives the x-coordinate of the curve to be graphed.void
Set the function that gives the y-coordinate of the curve to be graphed.Methods inherited from class edu.hws.jcm.draw.Drawable
getVisible, needsRedraw, setOwnerData, setVisible
-
Constructor Details
-
ParametricCurve
public ParametricCurve()Create a ParametricCurve with nothing to graph. The functions and other values can be set later. -
ParametricCurve
Create a parametric curve with x and y coordinates given by the specified functions of the parameter t. Defaults values are used for tmin, tmax, and the number of intervals. If either function is null, nothing is drawn. -
ParametricCurve
Create a parametric curve with the specified values.- Parameters:
xFunc
- A Function of one variable giving the x-coordinate of points on the curve. If this is null, then nothing will be drawn.yFunc
- A Function of one variable giving the y-coordinate of points on the curve. If this is null, then nothing will be drawn.tmin
- A Value object giving one endpoint of the domain of the parameter. If this is null, the default value -5 is used.tmax
- A Value object giving the second endpoint of the domain of the parameter. If this is null, the default value 5 is used. Note that it is not required that tmax be greater than tmin.intervals
- A Value object giving the number of intervals into which the domain is subdivided. If this is null, the default value 200 is used. The number of points on the curve will be the number of intervals plus one (unless a function is undefined at some value of the parameter or if a discontinuity is detected). The number of intervals is clamped to the range 1 to 10000. Values outside this range would certainly be unreasonable.
-
-
Method Details
-
setColor
Set the color to be used for drawing the graph. -
getColor
Get the color that is used to draw the graph. -
setFunctions
Sets the functions that gives the coordinates of the curve to be graphed. If either function is null, then nothing is drawn. If non-null, each function must be a function of one variable. -
setXFunction
Set the function that gives the x-coordinate of the curve to be graphed. If this is null, then nothing is drawn. If non-null, it must be a function of one variable. -
setYFunction
Set the function that gives the y-coordinate of the curve to be graphed. If this is null, then nothing is drawn. If non-null, it must be a function of one variable. -
getXFunction
Get the (possibly null) function that gives the x-coordinate of the curve. -
getYFunction
Get the (possibly null) function that gives the y-coordinate of the curve. -
setIntervals
Specify the number of subintervals into which the domain of the parametric curve is divided. The interval (tmin,tmax) is divided into subintervals. X and y coordinates of the parametric curve are computed at each endpoint of these subintervals, and then the points are connected by lines. If the parameter of this function is null, or if no interval count is ever specified, then a default value of 200 is used. -
getIntervals
Get the value object, possibly null, that determines the number of points on the curve. -
setLimits
Set the Value objects that specify the domain of the paratmeter. -
getTMin
Get the Value object, possibly null, that gives the left endpoint of the domain of the parameter. -
getTMax
Get the Value object, possibly null, that gives the right endpoint of the domain of the parameter. -
setTMin
Set the Value object that gives the left endpoint of the domain of the parameter. If this is null, then a default value of -5 is used for the left endpoint. (Note: actually, it's not required that tmin be less than tmax, so this might really be the "right" endpoint.) -
setTMax
Set the Value object that gives the right endpoint of the domain of the parameter. If this is null, then a default value of 5 is used for the right endpoint. (Note: actually, it's not required that tmin be less than tmax, so this might really be the "left" endpoint.) -
compute
public void compute()Recompute data for the graph and make sure that the area of the display canvas that shows the graph is redrawn. This method is ordinarily called by a Controller.- Specified by:
compute
in interfaceComputable
-
draw
Draw the graph (possibly recomputing the data if the CoordinateRect has changed). This is not usually called directly.- Specified by:
draw
in classDrawable
- 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.
-