setting color of the text in qwtdial partially

i can able to set the color of the text in qwt dial.
but i need to set the color of the text partially.

Example:
if lowerbound is 0 and upperbound is 100

i need the text color for 0 to 40 to be one color(say green)
and text color for 40 to 100 to be another color(say blue)

Overload QwtRoundScaleDraw::label() and assign your derived class using QwtDial::setScaleDraw().
By using QwtText::setColor() you can set individual color for a label.

Uwe

Quote:

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Originally Posted by Uwe

Overload QwtRoundScaleDraw::label() and assign your derived class using QwtDial::setScaleDraw().
By using QwtText::setColor() you can set individual color for a label.

Uwe

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Thanks Uwe

i need the color of dial also as two different colors
like first half part of the dial as one color and remaining half of the dial as another color

Which parts of the dial - do you have a screenshot ?

Uwe

Attachment 11225

i have attached the image

Again you can do it by overloading methods from QwtRoundScaleDraw - here drawBackbone(). You could use a gradient or draw the arc in segments with different pens.
Have a look at the default implementations of QwtRoundScaleDraw, then it should be straightforward how to do it.

Uwe

Quote:

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Originally Posted by Uwe

Again you can do it by overloading methods from QwtRoundScaleDraw - here drawBackbone(). You could use a gradient or draw the arc in segments with different pens.
Have a look at the default implementations of QwtRoundScaleDraw, then it should be straightforward how to do it.

Uwe

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I referred QwtRoundScaleDraw .but i couldn't understand..

please can you give me example for drawBackbone in QwtRoundScaleDraw

Qwt is open source - there is no better example than simply looking at the code.

Uwe