This method returns the corresponding glyph indices for the characters in the example. To transition from characters to glyphs, you call GetGlyphIndices. In the example so far, there are 3 runs: one with vertical glyphs and two without. Now that you know the run contains vertical glyphs, you need to get access to those glyphs. In the example image, this function returns 3 runs: 'English', 'дёе›Ѕ', and 'English.' Going from characters to glyphs The source and sink take in the glyph runs and let you check if they are oriented vertically or not.ДЄfter you implement your source and sink, you call the AnalyzeVerticalGlyphOrientation method. To determine the orientation of the text you have, you need to implement the IDWriteTextAnalysisSink1 and IDWriteTextAnalysisSource1 interfaces. This difference in orientation is seen in the example here. On the other hand, in a vertical layout, the Chinese text remains upright, and the Latin text is rotated 90 degrees. For example, in traditional horizontal layout, both the Latin text and the Chinese text are oriented vertically.

Analyzing character orientationД®very character has a preferred character orientation, or the direction that the character should be oriented in any directional layout. Then you can create and draw a vertical IDWriteTextLayout object.

To draw the text vertically, pass DWRITE_READING_DIRECTION_TOP_TO_BOTTOM to the IDWriteTextFormat::SetReadingDirection method and DWRITE_FLOW_DIRECTION_RIGHT_TO_LEFT to the IDWriteTextFormatSetFlowDirection method. You can draw vertical text with Direct2D by using the DrawTextLayout methods. Starting with the WindowsВ 8, DirectWrite has a number of new APIs that allow you to use vertical text in your apps.

Vertically center text g docs