Feature #3659: How do I control the color of text in Wt::WCartesianChart - Wt - Redmine

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Feature #3659

closed

How do I control the color of text in Wt::WCartesianChart

Added by Mikey Nosihcan about 10 years ago. Updated almost 10 years ago.

Status:

Closed

Priority:

High

Assignee:

Benoit Daccache

Target version:

3.3.4

Start date:

11/11/2014

Due date:

% Done:

Estimated time:

Description

0 down vote favorite

I am using Wt::WCartesianChart. (C++11 on Ubuntu 14.04 with default gcc tool chain) I wrote the following code:

void DecorateChart( WCartesianChart* chart )
{
    WAxis& x_axis = chart->axis( Wt::Chart::Axis::XAxis );
    WColor clrX( 255, 0, 0 );
    WPen pX;
    pX.setColor( clrX );
    pX.setWidth( 3 );
    x_axis.setPen( pX );
   ...
}

This code works fine. x axis on the chart is displayed in bright red. But the label fonts are still rendered in black.

How do I control the color of fonts on the x Axis, and in general, the color of fonts in Wt::Chart widgets - WFont does not seem have a way to control colors - no pen, no brush, no color properties.

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Updated by Mikey Nosihcan about 10 years ago

I am still quite new to Wt, and reading through the docs I found WStandardPalette, so I also tried:

    WColor clrS( 0, 255,255 );
    WPen cp = chart->palette( )->strokePen( 0 );
    cp.setColor( clrS );

So that the fonts would show in bright blue/green but this did seem to have any effect. I am unclear as to how add, access and use pens and brushes with WStandardPalette.

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Updated by Koen Deforche about 10 years ago

Tracker changed from Support to Feature
Assignee set to Koen Deforche

That doesn't change the color in the palette (standard palette doesn't allow that).

You will want to implement a custom palette (specialize Wt::Chart::WChartPalette).

As to the original question: an API call indeed seems to be missing to configure the pen color used for rendering text.

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Updated by Mikey Nosihcan about 10 years ago

You will want to implement a custom palette (specialize Wt::Chart::WChartPalette).

OK - will do that, see what it gets me. I did see the docs talking about that, haven't had a chance to get into it yet.

An API call indeed seems to be missing to configure the pen color used for rendering text.

I guess that should become a feature request. I am working with mathematical charts, and I also prefer a dark background with various colors showing different axes in different colors and their relationships to one another - having fonts to match the axis color and that will show up well on dark backgrounds is quite important.

But over-all I am very excited with Wt - I have worked a good deal with gtkmm and Qt so I was up and running with it very quickly. I have been waitng for a tool like this for a long time - finally I can use C to write browser based apps - it's like the holy grail of development for me.

Tnx

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