Graphics Ques & Array List Wrapping

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M Smith - 30 Mar 2004 00:28 GMT

Hi im turning to you guys for two trivial questions, the first, I am drawing
a line using g.drawPolyline() how can I make each line a different colour,
the g.setColour() allows me to set the colour of the entire canvas as the
repaint method is required to show a newly drawn line ?

My second question is, how do I wrap an Array List as in place an entire
list into the first index of another array list or basic array, I presume it
needs to be wrapped but is there an easier way ?.

Hope that's semi clear, Thanks Pete

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Andrew Thompson - 30 Mar 2004 00:35 GMT

> My second question is, how do I wrap an Array List as in place an entire
> list into the first index of another array list or basic array, I presume it
> needs to be wrapped but is there an easier way ?.

That has nothing to do with GUI's, try..
<http://www.physci.org/codes/javafaq.jsp#cljh>

OR, once you have learned what the
various groups are for, maybe..
<http://www.physci.org/codes/javafaq.jsp#cljp>

But no, stick with the former for the moment.

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Andrew Thompson
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Thomas Weidenfeller - 30 Mar 2004 07:48 GMT

> Hi im turning to you guys for two trivial questions, the first, I am drawing
> a line using g.drawPolyline() how can I make each line a different colour,

By drawing individual lines instead of a polyline.

See a good textbook about Java, or comp.lang.java.help.

/Thomas

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Babu Kalakrishnan - 30 Mar 2004 08:02 GMT

> Hi im turning to you guys for two trivial questions, the first, I am drawing
> a line using g.drawPolyline() how can I make each line a different colour,
> the g.setColour() allows me to set the colour of the entire canvas as the
> repaint method is required to show a newly drawn line ?

Obviously you cannot use the drawPolyLine method to achieve what you want.
Instead write your own method that does what you want and call it.

For instance :

private drawColoredPolyLine(     Graphics g,
                int[] xPoints,
                int[]yPoints,
                int nPoints,
                Color[] colors)
{
    for (int i=1; i < nPoints, i++)
    {
        g.setColor(colors[i-1]);
        g.drawLine( xPoints[i-1],yPoints[i-1],
                yPoints[i],yPoints[i]);
    }
}

That isn't very clear. Why do you need a special wrapping to do that ? An
ArrayList is an object, and I don't see any problem in adding it directly
to another ArrayList (or placing it into an Array of objects)

BK

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Graphics Ques & Array List Wrapping

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