Question: EDIT: I got rid of the errors by doing a build project. I have 2 errors and can't figure them out with a JavaFX lab.
EDIT: I got rid of the errors by doing a build project.
I have 2 errors and can't figure them out with a JavaFX lab.
a) The type GraphManagerInterface cannot be a superinterface of GraphManager; a superinterface must be an interface --public class GraphManager implements GraphManagerInterface
b)function1 = new Function1(); - Eclipse is saying change function1 to Function1, and when I do, it says to change it back. So I'm not sure whats going on.
----------------------------------------
*
The manager deals with the specified functions, i.e., selecting the function that the user wants,
* setting the x-axis and y-axis extents that the user wants plotted, getting the function value at a
* specified x, and getting the y value to be drawn on the GUI.
* @author ralexander
*
*/
public class GraphManager implements GraphManagerInterface {
private double xLeft, xRight;
private double yTop = Integer.MIN_VALUE;
private double yBottom = Integer.MAX_VALUE;
private int functionChoice=-999;
Function function1, function2, function3, function4, function5, function6;
/**
* Constructor instantiates the functions specified.
*/
GraphManager() {
function1 = new Function1();
function2 = new Function2();
function3 = new Function3();
}
/**
* getFnValue calculates the value of the function requested by the user, at a specific x value.
* @param fnNum the choice of which function to evaluate
* @param x the value at which to evaluate the function
* @return the value of f(x)
*/
public double getFnValue (int fnNum, double x) {
switch(fnNum) {
case 1: return function1.fnValue(x);
case 2: return function2.fnValue(x);
case 3: return function3.fnValue(x);
default: return 0;
}
}
/**
* Sets the function choice
* @param choice an integer indexing the function desired
*/
public void setFunctionChoice(int choice) {
functionChoice = choice;
}
/**
* Gets the function index previously selected by the user
* @return an index 1-4 corresponding to a function
*/
public int getFunctionChoice() {
return functionChoice;
}
/**
* Gets the actual function instance
* @param choice the index of the function desired
* @return an instance of a sub-class of the Function class
*/
public Function getFunction(int choice) {
switch(choice) {
case 1: return function1;
case 2: return function2;
case 3: return function3;
default: return null;
}
}
/**
* Sets the left and right extents to be considered, and computes and sets the minimum and maximum
* values of f(x) for those left-right extents.
* @param xLeft user's desired left extent
* @param xRight user's desired right extent
* @param d width of the panel in pixels
*/
public void setExtents(double xLeft, double xRight, double d) {
this.xLeft = xLeft;
this.xRight = xRight;
double x0=xLeft, x1=0, y1;
Function fn = getFunction(functionChoice);
yTop = Integer.MIN_VALUE;
yBottom = Integer.MAX_VALUE;
y1 = fn.fnValue(x0);
if (y1>yTop && y1
if (y1Integer.MIN_VALUE) yBottom=y1;
for (int i=1; i
x1 = x0+((xRight-xLeft)/d);
y1 = fn.fnValue(x1);
if (y1>yTop && y1
if (y1Integer.MIN_VALUE) yBottom=y1;
x0=x1;
}
System.out.println("xLeft = "+xLeft+"; xRight = "+xRight+" maxY = "+yTop+"; minY = "+yBottom+" gridWidth = "+d);
}
/**
* Gets the left extent of the function to be considered
* @return the x value of the left extent as a double
*/
public double getLeftExtent () {
return xLeft;
}
/**
* Gets the right extent of the function to be considered
* @return the x value of the right extent as a double
*/
public double getRightExtent () {
return xRight;
}
/**
* Gets the top extent of the function to be considered
* @return the maximum f(x) value that occurs from left to right
*/
public double getTopExtent () {
return yTop;
}
/**
* Gets the bottom extent of the function to be considered
* @return the minimum f(x) value that occurs from left to right
*/
public double getBottomExtent () {
return yBottom;
}
/**
* Overrides toString, creating a string describing the functions' formulas
*/
public String toString() {
String rtnString = "";
rtnString+="1. "+function1.toString()+" ";
rtnString+="2. "+function2.toString()+" ";
rtnString+="3. "+function3.toString()+" ";
return rtnString;
}
}
----------------------
public interface GraphManagerInterface {
/**
* getFnValue calculates the value of the function requested by the user, at a specific x value.
* @param fnNum the choice of which function to evaluate
* @param x the value at which to evaluate the function
* @return the value of f(x)
*/
public double getFnValue (int fnNum, double x);
/**
* Gets the actual function instance
* @param choice the index of the function desired
* @return an instance of a sub-class of the Function class
*/
public Function getFunction(int choice);
/**
* Sets the left and right extents to be considered, and computes and sets the minimum and maximum
* values of f(x) for those left-right extents. Note that these values are NOT transformed to fit in the
* display grid, they are just the values of x and f(x)
* @param xLeft user's desired left extent
* @param xRight user's desired right extent
* @param gridWidth width of the panel in pixels
*/
public void setExtents(double xLeft, double xRight, double gridWidth);
/**
* Gets the left extent of the function to be considered
* @return the x value of the left extent as a double
*/
public double getLeftExtent ();
/**
* Gets the right extent of the function to be considered
* @return the x value of the right extent as a double
*/
public double getRightExtent ();
/**
* Gets the top extent of the function to be considered
* @return the maximum f(x) value that occurs from left to right
*/
public double getTopExtent ();
/**
* Gets the bottom extent of the function to be considered
* @return the minimum f(x) value that occurs from left to right
*/
public double getBottomExtent ();
}
---------------------
public class Function1 extends Function {
@Override
public double fnValue(double x) {
if (x==0.0)
return Double.MAX_VALUE;
else
return 1/x;
}
public String toString() {
return "1/x";
}
}
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