How to set different colors?

[n-2204]

QVector<QColor> colors = { QColor(255,0,0), QColor(0,255,0), QColor(0,0,255),
QColor(0,0,0), QColor(255,255,255), QColor(0,128,64) };
for(int i=0;i<6;i++)
line->setPen(colors[i]);
}
i unable to set diff color..using this code only same color lines drawn..as i value in not incremented when second time line drawn ?
what changes req..?any suggestions

[jsulm]

@n-2204 said in How to set different colors?:

i unable to set diff color..using this code only same color lines drawn

Of course it can't work this way! And it is not what I suggested! Please read my post once more...
That's why I asked how your class actually draws. You still did not answer this question (I have no idea how CHPlotCurve does the drawing)...

[n-2204]

I'm using these predefined classes..
@jsulm CHPlotCurve -Class to draw the data as a line curve in the graph canvas area(x-y plane).
CHPlotCurve--derived from QwtPlotCurve class
void CHPlotCurve::setSamples(QwtSeriesData<QPointF> *). CHPlotCurveData is derived from QwtSeriesData<QPointF>. This function is part of the one of the base class of CHPlotCurve.
There are two ways to set color is using setBrush or setpen

[jsulm]

@n-2204 If there is no support for different colors for different segments of a line then you can still draw each segment separately as one line.

[n-2204]

@jsulm yes.. line able to draw.. but how i set color for these line.. like line drawn then how can i set a color to that??

[jsulm]

@n-2204 Come on you already set the color! So, what is your question now?

[n-2204]

@jsulm yes.. this color will be same for each line drawn .. but i need to set diff color for 1,2 3 etc lines... thats why i tried using loop

[jsulm]

@n-2204 If you can set color for one line then you can set color for every line. Something like:

// Line 1
QPointF pt1(X, Y);
WHAT_EVER_LINE_DATA_IS linedata1;
linedata1->append(pt1);
CHPlotCurve* line1 = (CHPlotCurve*)pGr->insertCurve("line", CHPlotGraph2D::Line, false);
line1->setSamples(linedata1);
line1->setPen(Qt::blue, 2, Qt::SolidLine);

// Line 2
QPointF pt2(X2, Y2);
WHAT_EVER_LINE_DATA_IS linedata2;
linedata2->append(pt2);
CHPlotCurve* line2 = (CHPlotCurve*)pGr->insertCurve("line", CHPlotGraph2D::Line, false);
line2->setSamples(linedata2);
line2->setPen(Qt::red, 2, Qt::SolidLine)

Also, please consider that this CHPlotCurve is not part of Qt, you should consider checking its documentation and ask in a different forum (if there is one).

[n-2204]

@jsulm ya thanks I knw this .. but problem is I'm taking point from table ..i can't do like this

[jsulm]

@n-2204 said in How to set different colors?:

I'm taking point from table

So what?
Take the points from the table, I don't see how this stops you from doing it the way I suggested...

[n-2204]

@jsulm I have 8 rows in table so i will do 8 times first store every row data then do this ? is this a way ?
Thanks for your answers.
every time i take point ..create line data and pass to line
CHPlotCurveData* linedata1 = new CHPlotCurveData();
CHPlotCurve* line = (CHPlotCurve*)pGr->insertCurve("line", CHPlotGraph2D::Line, false);

[jsulm]

@n-2204 Simply iterate over the rows of your table in a loop. For each row take the point coordinates, create the line, set color...

[n-2204]

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