Change the color of the qwt plot axis, numbers and ticks

[locke]

I believe you have to override QwtScaleDraw with your own QwtScaleDraw::label routine. The label routine returns a QwtText which can have a color. Here's an example:

class ScaleDraw: public QwtScaleDraw
{
public:
    ScaleDraw ();
    virtual ~ScaleDraw () {};
 
    virtual QwtText label (double value) const
    {
        QwtText ret_val = QwtText (QString::number (value));
        ret_val.setColor (_color);
        return ret_val;
    };
 
private:
    QColor _color;
};

class ScaleDraw: public QwtScaleDraw
{
public:
    ScaleDraw ();
    virtual ~ScaleDraw () {};

    virtual QwtText label (double value) const
    {
        QwtText ret_val = QwtText (QString::number (value));
        ret_val.setColor (_color);
        return ret_val;
    };

private:
    QColor _color;
};

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Joey

Hi again, I think I triyed that solution before with no result.

Y create a similar code

class NewDraw: public QwtScaleDraw
{
public:
    NewDraw(QColor c)  {my_color = c;};
      virtual QwtText label (double value) const
      {
          QwtText ret_val = QwtText (QString::number (value));
          ret_val.setColor (my_color);
          return ret_val;
      };
 
  private:
      QColor my_color;
};

class NewDraw: public QwtScaleDraw
{
public:
    NewDraw(QColor c)  {my_color = c;};
      virtual QwtText label (double value) const
      {
          QwtText ret_val = QwtText (QString::number (value));
          ret_val.setColor (my_color);
          return ret_val;
      };

  private:
      QColor my_color;
};

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And when I want to chande de color:

QColor c = QColorDialog::getColor( Qt::white, this );
 
    my_Plot->setAxisScaleDraw(QwtPlot::xBottom, new NewDraw(c));

QColor c = QColorDialog::getColor( Qt::white, this );

    my_Plot->setAxisScaleDraw(QwtPlot::xBottom, new NewDraw(c));

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But it doesnt work. Instead of changing the color of the numbers, all the numbers and ticks disappear. Any idea? Thanx

[bigjoeystud]

The only time I've seen this is when you are putting things on the stack instead of allocating on the heap. However, if you are doing a new, that's probably right... Your code is virtually identical to mine so I'm at a loss. The only other thing I do differently is also set a font right before setting the color, but I doubt that has anything to do with it. You are only setting the AxisScaleDraw once, right?

Joey

[locke]

Yes, only once. I cannot find the solution and there is no much more threads related to this problem

[uguryildiz]

I tried the following and it works.

QwtScaleWidget *qwtsw = myqwtplot.axisWidget(QwtPlot::xBottom);	
	QPalette palette = qwtsw->palette();	
	palette.setColor( QPalette::WindowText, Qt::gray);	// for ticks
	palette.setColor( QPalette::Text, Qt::gray);	                // for ticks' labels
	qwtsw->setPalette( palette );

QwtScaleWidget *qwtsw = myqwtplot.axisWidget(QwtPlot::xBottom);	
	QPalette palette = qwtsw->palette();	
	palette.setColor( QPalette::WindowText, Qt::gray);	// for ticks
	palette.setColor( QPalette::Text, Qt::gray);	                // for ticks' labels
	qwtsw->setPalette( palette );

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