For this reason, the WPF class I'm really interested in is PathFigure, which is a single collection of connected straight lines and curves. You probably don't want to deal with a text string jumping across a disconnection in the path. In placing text on a path, it's pretty much essential that the lines and curves comprising the path be connected end to end with each other.
StreamGeometry offers better performance, but the individual points that define the path become fixed and cannot be animated.
In WPF, the graphics path is encapsulated in both the PathGeometry and StreamGeometry classes. Some of these lines and curves might be connected to each other. The hard part is properly informing the WPF layout system of the correct size of the resultant graphic.Ī graphics path is a collection of straight lines and curves. In putting text on a path, the big problem really isn't figuring out how to move and rotate the text characters. As is also common in WPF, the difficult part of the job turns out to be something other than what might originally be assumed. When programming for Windows Presentation Foundation (WPF), a significant bonus accompanies the programming of text on a path: you can animate the individual points defining the path and watch the characters bounce around in response.Īs usual in WPF, there is more than one way to do this job, and I'll demonstrate several approaches.
In graphics programming, a collection of straight lines and curves is called a "path," so this task is sometimes described as "text on a path," and that's what I'll tackle in this column. One desirable technique is positioning text characters along a curved line, as shown in Figure 1. By treating text characters as graphical objects, the programmer can make text dance and fly on the screen. Computer graphics can also release text from the confines of its customary line-by-line progression. Text can be made inviting or forbidding, soothing or stormy. Whether printed or displayed on a computer screen, the choice of font can enhance or detract from the impact of the text. Text is more than just its literal meaning. Code download available from the MSDN Code Gallery Contents
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