QGIS » Quantum GIS Desktop

This document describes missing bits in the new symbology and labeling engines

Symbology¶

Categorized renderer¶

• The term "color ramp" as a term for different types of "color tables" is problematic. A ramp is for me the equivalent of a gradient. I just discovered today that color ramps also cover "random colors" and "color brewer" color tables. Which is nice. I would call the parent "color table" and the three types: color ramp (or gradient), random colors, color brewer.
  : +1 --Anitagraser 16:18, 19 January 2011 (UTC)

Rule based Renderer¶

• Needs ability to re-order rules once they are added (up and down buttons)
• Needs alias columns for the legend. Currently the rule is displayed in the legend, which is not very nice (should be fixed in #3222)
• Needs an icon for the GUI (combobox with the renderer choice)
• Needs to ability to use symbol levels. Currently it is impossible. A simple fix is to use only the first matching rule when symbol levels are on (patch proposed in #3222). A better fix would be to have the possibility to choose whether or not to stop after first matching rules (with or without symbol levels). Even better would be, for each rule, to say if this is the last rule to be matched (ignoring the following if it's matched) or not.
• Improvements from Mayeul once they are ready (#3222)
• The GUI feels inconsistent: It uses the terms "rule" and "filter" randomly - while I guess both mean the same thing.
• Maybe this could also offer data-defined symbology (e.g. data-defined fill color)
• Ability to turn off selected rules/groups of rules.
• Ability to copy and paste a rule.

Point Displacement¶

• Needs an icon for the GUI (combobox with the renderer choice)

SVG patterns¶

• Need for data-defined rotation of the patterns

Simple Markers¶

• Should allow to specify stroke-width for simple markers. Used to work in old symbology. (see #3458)
• Should allow to specify fill pattern for simple markers. The patch at #3430 does this, and enables layers using the feature to be switched from old symbology to new symbology successfully.

SVG symbols¶

• need for hierarchical display of SVG symbols, corresponding to the folders in the SVG directory

SVG repository for symbols, patterns and markers¶

• separation of SVG symbols for point symbols, markers and patterns
• Online symbol repositories for easy extraction/installation of symbols from the web

Line Decorations/Marker Lines¶

• The polyline symbology type "Line decoration" should be removed because it is already covered by type "Outline: Marker Line".
• Likewise, the polygon symbol layer type "Outline: Line decoration" is unnecessary and should be removed.

Labeling¶

• Old label engine settings should be replaced by new label engine settings in layer properties, or removed and delegated to the current label settings dialogue
• multiple scale ranges for different label settings instead of just one min/max scale range per layer, this would remove the need to introduce additional layers, just for the purpose of different label settings for a specific scale range
• Buffer transparency missing in new label settings
• Ability to rotate label either based on a field or with a fixed value independently of choosing an x and y field for the label position.
• Labels should be preserved as text in SVG output (as used to be the case in old labeling engine).
• Curved labels need as "improvement" (as at the momement are barely usable): in this ticket #4855 there are samples to allow understand that if a line is simple, almast flat, but made of a few nodes than the curved labels is not drawn. On the other end curved lines created with the cad tools or with the freehand plugin (so with many many nodes) get always the curved label.
• There is a serious issue #4634 with both "around centroid" and "over centroid" options (maybe related also to this #4079)
• There are options that when used are causing QGIS to crash #3802
• labels buffers are broken #3652

Symbology and Labeling tickets¶

See QGIS bugtracker, Symbology and Labelling components.