Programming Forums > Application Development > Java

rross46 · Nov 6th, 2005, 5:52 AM

Hi.

I am trying to make a button bean, well a set of them having arrows facing in directions (n,s,e,w). I am having great difficulty drawing the triangles which will represent the direction.

I understand you use drawPolygon(i think) to do this but...

In the help features of Net Beans 4.1, it says drawPolygon(int[],int[],int[]);
When i go to try put this in, it totally does not like it.

(Toggle Plain Text)

public LeftButtonBean() {
        super();
        setPreferredSize(new Dimension (50,50));
        setBorder(null);
        buttonColour=Color.black;
    }
    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        g.setColor(buttonColour);
        g.drawPolygon();
        
      
    }

right i have that so far, i have left paramaters out of the draw polygon, which gives me "error, cannot find symbol method drawPolygon()".

Right does anyone know how i should go about this, the help just confuses me with its representations of what the parameters needed are.

Before anyone asks, i am a novice in Java programming. Please don't ask "why are you using java?" lol.

Thanks in advance guys.

Polyphemus_ · Nov 6th, 2005, 8:30 AM

Why are you using java?

No, serious now. The function drawPolygon() does not exist. The function drawPolygon(int[] xPoints, int[] yPoints, int nPoints) does. You can have two functions with the same name, but different parameters. You can give them completely different content, although it isn't recommended - it will be difficult to know by heart what parameter does what

.

rross46 · Nov 6th, 2005, 10:54 AM

can you give me an example of acceptable parameters lol? and example of it in use please?

andro · Nov 6th, 2005, 4:42 PM

It wants 3 things:

int[] xPoints: A list of the X coords.
int[] yPoints: A list of the Y coords.
int nPoints: Number of points.

rross46 · Nov 7th, 2005, 8:16 AM

Well i think i got the format for entering the parameters.

get no errors with it, but it displays nothing lol.

i had declared; int xPoints[]=new int[num]; int yPoints[]=new int[num];
i had one for n, but it did'nt like that so i just entered a number, so when i call the method its like g.drawPolygon(xPoints,yPoints,num);

Note num aint a var or anything lol, ive been playing around with numbers to try get it to display, but no joy :mad:

Nov 6th, 2005, 5:52 AM	#1
rross46 Newbie Join Date: Nov 2005 Posts: 4 Rep Power: 0	Simple, yet annoying problem with Java Beans Hi. I am trying to make a button bean, well a set of them having arrows facing in directions (n,s,e,w). I am having great difficulty drawing the triangles which will represent the direction. I understand you use drawPolygon(i think) to do this but... In the help features of Net Beans 4.1, it says drawPolygon(int[],int[],int[]); When i go to try put this in, it totally does not like it. (Toggle Plain Text) public LeftButtonBean() { super(); setPreferredSize(new Dimension (50,50)); setBorder(null); buttonColour=Color.black; } public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(buttonColour); g.drawPolygon(); } public LeftButtonBean() { super(); setPreferredSize(new Dimension (50,50)); setBorder(null); buttonColour=Color.black; } public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(buttonColour); g.drawPolygon(); } right i have that so far, i have left paramaters out of the draw polygon, which gives me "error, cannot find symbol method drawPolygon()". Right does anyone know how i should go about this, the help just confuses me with its representations of what the parameters needed are. Before anyone asks, i am a novice in Java programming. Please don't ask "why are you using java?" lol. Thanks in advance guys.

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Nov 6th, 2005, 8:30 AM	#2
Polyphemus_ Expert Programmer Join Date: Aug 2005 Location: Rotterdam, the Netherlands Posts: 942 Rep Power: 4	Why are you using java? No, serious now. The function drawPolygon() does not exist. The function drawPolygon(int[] xPoints, int[] yPoints, int nPoints) does. You can have two functions with the same name, but different parameters. You can give them completely different content, although it isn't recommended - it will be difficult to know by heart what parameter does what .

Nov 6th, 2005, 10:54 AM	#3
rross46 Newbie Join Date: Nov 2005 Posts: 4 Rep Power: 0	can you give me an example of acceptable parameters lol? and example of it in use please?

Nov 6th, 2005, 4:42 PM	#4
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 310 Rep Power: 3	It wants 3 things: int[] xPoints: A list of the X coords. int[] yPoints: A list of the Y coords. int nPoints: Number of points.

Nov 7th, 2005, 8:16 AM	#5
rross46 Newbie Join Date: Nov 2005 Posts: 4 Rep Power: 0	Well i think i got the format for entering the parameters. get no errors with it, but it displays nothing lol. i had declared; int xPoints[]=new int[num]; int yPoints[]=new int[num]; i had one for n, but it did'nt like that so i just entered a number, so when i call the method its like g.drawPolygon(xPoints,yPoints,num); Note num aint a var or anything lol, ive been playing around with numbers to try get it to display, but no joy :mad:

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Programming Forums > Application Development > Java

Simple, yet annoying problem with Java Beans