SSRS 2012 - Dynamic sizing of charts

With SSRS 2008 Microsoft introduced a nice feature to he chart item - the ability to dynamically resize it at run-time. All you need is an expression that defines how the size gets calculated.

To see how it works and what the advantages are we will modify our Gantt chart from Gantt charts in SSRS 2012 - the chart approach.

Gantt charts in SSRS 2012 - the chart approach

This post is the second part of a series concerning Gantt charts in SSRS 2012. The initial post was Gantt charts in SSRS 2012 - three approaches to rule them all.

The chart approach is the most obvious solution.
TL;DR: It's a horizontal stacked bar chart trimmed to look like a Gantt chart. If you already know that approach - which can be found widely throughout the net - you can skip that post and wait for the next ones in this series.