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Thread: Need help with pie charts locations

  1. #1
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    Default Need help with pie charts locations

    How to make centers for multiple pie charts using for loop?


  2. #2
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    Default Re: Need help with pie charts locations

    What code are you having problems with? Please post the code and your questions.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with pie charts locations

    Quote Originally Posted by Norm View Post
    What code are you having problems with? Please post the code and your questions.
    public int getCenterPoint(int x1,int y1){

    int xCenter = getWidth()/ 2;
    int yCenter = getHeight()/ 2;
    int radius = (int) (Math.min(getWidth(), getHeight()) * 0.4);
    int diameter = 2 * radius;
    int row = dcRef.columns[0].array.length; // number of rows

    for (int i=0; i<row; i++) { // here is the problem (dead code)

    x1 = xCenter - radius ;
    y1 = yCenter - radius;
    x1 = x1 + diameter + i;
    return x1;
    }


    return y1;
    }

    How to get centers for multiple pie charts?
    Last edited by Wise girl; June 13th, 2012 at 02:44 PM.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Need help with pie charts locations

    The return x1 inside the loop will end the loop immediately.
    The getCenterPoint() method returns an int value. Does a point have two values: x & y How is one int value a point?

    Please describe what that method is supposed to do. It is passed: x & y (a point?) and then does what?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with pie charts locations

    Yes, it returns points x & y. I will call this method then in another method that plots the pie charts.

  6. #6
    Super Moderator Norm's Avatar
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    Default Re: Need help with pie charts locations

    The method only returns one int, not two ints. It either returns x or it returns y, not both.
    Can you describe the steps the method should take to compute values and what value(s) it should return?
    There is a class: Point that can hold an x & y value if you want to return them.

    The x1 and y1 values passed to the method are not used???
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with pie charts locations

    I wanna call that method in this method

    private void execute(String actionLine, Graphics g ) {
    System.out.println("action=" + actionLine);


    Color color[] = {Color.pink,
    Color.blue,
    Color.white,
    Color.blue,
    Color.red};


    int row = dcRef.columns[0].array.length;
    int col = dcRef.columns.length;

    double sum = 0.0;
    for (int i = 0; i < row; i++) {
    for (int j = 0; j < col; j++){
    sum += dcRef.columns[j].array[i];

    }
    }


    for (int i=0; i<row; i++) {

    this.getCenterPoint(x1, y1); // call

    for (int j=0; j<col; j++){

    int startAngle = (int)( j* 360 / sum);
    int arcAngle = (int)( i * 360 / sum);

    if (i == row-1) {
    arcAngle = 360 - startAngle;
    }

    Color co = color[j];
    g.setColor(co);


    g.fillArc(x1 , y1, width, height ,startAngle, arcAngle );

    startAngle+=arcAngle;


    }

    }
    }

  8. #8
    Super Moderator Norm's Avatar
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    Default Re: Need help with pie charts locations

    Please explain what you want the getCenterPoint method to do. What parameters does it need, what values will it compute and what will it return.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Need help with pie charts locations

    I want it to hold the values of x & y

  10. #10
    Super Moderator Norm's Avatar
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    Default Re: Need help with pie charts locations

    Methods do not HOLD values.
    Use the Point class if you want something to hold the values of x & y
    If you don't understand my answer, don't ignore it, ask a question.

  11. #11
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    Default Re: Need help with pie charts locations

    Ok, I will try that.

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