I am using SQL Server Reporting Services 2008 R2. I use Visual Studio 2008 to develop my reports.
I have a report that contains a Line Chart. The Y-axis of the chart has a range of 0 up to 100. While in design view of the report, if I go to the chart and right-click directly above the X-axis and directly right of the Y-axis, the shortcut menu will allow me to click on Chart Area Properties. After the dialog box appears, I click Fill in the left pane. Now I can set background fill options. I go to Fill Style and choose Gradient, I set the primary color to Automatic, the secondary color to Red, and the Gradient Style to TopBottom (in my case the Automatic [or default] color is white).
When saving my settings and previewing the report, the chart is filled with solid red starting at 0 (on the Y-axis) and as it goes up toward 100, the red begins to fade, until everything is white by the time it reaches 100. All this is expected behavior.
What I would like to be able to do is to limit the gradient range between 0 and 20. I want the solid red, which starts at 0, to begin to fade so that by the time it gets to 20, the red is completely gone, and everything from 20 to 100 is the automatic white color.
I was thinking that if I go back to the Chart Area Properties dialog box, and specifically, the Gradient Style dropdown list, I should be able to enter some kind of expression that would control the range of the gradient. I have tried creating a couple of different expressions, but have had no success. Does anyone know how I can do this?