I have a point shapefile with several numeric fields, among them FuelFlow and Slope. I have successfully applied colour to the various points according to the value of the FuelFlow field. Now I would like to control some other attribute of the map symbols (shape? size?) according to the value in the Slope field. Something like slope between 0 and 10 gets one display style, 10-20 gets a second style, 20-30 etc.
I get the sense that this is possible in QGIS (using v 2.2.0 - Windows) according to some of the tools in the Style dialog, but I don't know where to start. Can someone point me in the right direction. I believe I saw one online posting about using a CASE statement in the style definition, but now 1) I can't find it in the UI and 2) I don't know how to construct the CASE statement.