SlopeApplet API

SlopeApplet

Class to demonstrate the calculations associated with the slope of a line.

Applet Parameters:

xrange double..double (default = 0.0..1.0): Ex. <param name="xrange" value="-5.0..5.0">; x-value range
yrange double..double (default = 0.0..1.0): Ex. <param name="yrange" value="-5.0..5.0">; y-value range
showformula boolean true/false (default = false): Ex. <param name="showformula" value="true">; determines whether or not the slope formula is displayed
showequation boolean true/false (default = false): Ex. <param name="showequation" value="true">; determines whether or not the equation of the line is displayed
slope double (default = 1.0): Ex. <param name="slope" value="2.0">; Initial slope of the line
yintercept double (default = 0.0): Ex. <param name="yintercept" value="1.0">; Initial y-intercept of the line
secondline String parallel/perpendicular/userdefined/none (default = none): Ex. <param name="secondline" value="parallel">; Sets whether a second line exists, and if so, what type it should be; none = no second line; parallel = second line will always be parallel to the first, location set by user clicks; perpendicular = second line will always be perpendicular to the first, location set by user clicks; userdefined = second line is defined by slope/y-intercept or by two points, independent of the first line
slope2 double (default = 1.0): Ex. <param name="slope2" value="2.0">; Initial slope of the second line; Only used if secondline=userdefined
yintercept2 double (default = 0.0): Ex. <param name="yintercept" value="1.0">; Initial y-intercept of the second y-intercept; Only used if secondline=userdefined
showtitle boolean (default=false): Ex. <param name="showtitle" value="true">; If true, the title "Slope=Change in y / Change in x =Rise/Run" will appear at the top of the applet.

Public Constants:

None

Public Methods:

public void setSlope(String m): Sets the slope of the first line
public void setYIntercept(String b): Sets the y-intercept of the first line
public void setSlope(String m, int which): Sets the slope of the "which" line
public void setYIntercept(String b, int which): Sets the y-intercept of the "which" line
public void setPoints(String X1,String Y1,String X2,String Y2): Sets the first line by giving two coordinates on the line
public void setPoints(String X1,String Y1,String X2,String Y2,int which): Sets the "which" line by giving two coordinates on the line
public void showFormula(boolean show): Turns the formula on/off; corresponds to the "showformula" parameter
public void setSecondLine(String which): Sets the type of SecondLine; none = no second line; parallel = second line will always be parallel to the first, location set by user clicks; perpendicular = second line will always be perpendicular to the first, location set by user clicks; userdefined = second line is defined by slope/y-intercept or by two points, independent of the first line; corresponds to the "secondline" parameter
public boolean infSlope(int which): Returns whether the "which" line has infinite slope (i.e. the line is vertical)
public boolean isSlope(double m, int which): Returns whether the "which" line has a slope = "m"
public boolean isYInter(double b, int which): Returns whether the "which" line has a y-intercept = "b"
public boolean intersects(double x, double y, int which ): Returns whether the "which" line passes through the point (x,y)
public double getSlope(int which): Returns the slope of the "which" line
public double getYIntercept(int which): Returns the y-intercept of the "which" line