[reportlab-users] Charts and Axes dimensions

Troy Caldwell troy.caldwell at covchurch.org
Mon Sep 28 10:34:30 EDT 2009

Andy,Thanks for the response. This helps a lot!


On Mon, Sep 28, 2009 at 7:28 AM, Andy Robinson <andy at reportlab.com> wrote:

> 2009/9/27 Troy Caldwell <troy.caldwell at covchurch.org>:

> > I realize that if I place the chart at 0,0, my labels for both axes will

> be

> > outside the bounds of the drawing. They appear, but they appear where I

> > don't want them. I'm trying to figure out a way to calculate the width

> of

> > the y axis, and the height of the x axis so I can then make the decision

> on

> > where to place the chart itself to keep the entire image where I want it.


> The framework was designed for people using these charts within

> financial publications, alongside other tables and content. Often

> you want to stack up several charts above each other and be sure all

> the categories line up from one chart to the next. Therefore, we

> decided to make the inner 'plot rectangle' explicit (and this is what

> x,y,width and height refer to in each chart class). A consequence

> of this is that it's your job to allow enough space for the axis

> labels, which of course depends on the typical length of the text in

> those labels, and the font size and position you specify.


> This might need one or two tries at 'design time' but I can't see why

> you'd need to redo it for a lot of chart instances.


> If you need to know the precise size, every shape (including the

> charts) has a method called 'getBounds' which will return its actual

> size, including any text labels off the edge of the axis. This would

> let you set things up exactly right, at the expense of basically

> drawing things twice.


> Best Regards,


> --

> Andy Robinson

> CEO/Chief Architect

> ReportLab Europe Ltd.

> Media House, 3 Palmerston Road, Wimbledon, London SW19 1PG, UK

> Tel +44-20-8545-1570

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