QGIS » QGIS Application

The cool new histogram feature attached to the graduated symbology doesn't work with sized-based gratuation method.

1. Load a point dataset with a numerical column to use for graduation
2. Open the layer's symbology properties, and set the symbology to graduated
3. Pick the numerical column, set the method to size, and set size from 1 to 35 millimeters (the largest value should be high to better highlight the issue)
4. Make sure you have 5 classes and hit the classify button
5. Apply the classification, and check the layer legend (see attached classification-5_classes.png)
6. Go to the histogram tab, and add 5 steps by clicking on the histogram (add one step in between the already-present steps)
7. Apply the classification, and check the layer legend (see attached histogram-5_classes_added-wrong_size.png)
8. You'll notice the newly added steps through the histogram fail to size proportionally according to the settings

This is probably worth fixing before the release of 2.10, which will introduce the graduation histogram to the general users for the first time.