Eirik Bakke created NETBEANS-4166:
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Summary: Review likely inaccurate int-based character width
calculations in editor UI
Key: NETBEANS-4166
URL: https://issues.apache.org/jira/browse/NETBEANS-4166
Project: NetBeans
Issue Type: Bug
Components: editor - Painting & Printing
Affects Versions: 11.3
Environment: Windows and MacOS with HiDPI/retina displays, Java 9 and
above
Reporter: Eirik Bakke
While fixing NETBEANS-346, I discovered several other editor painting
coordinate calculations which are likely inaccurate due to rounding errors.
Fixing these will be a bit of work, though, and it may be preferable to wait
until specific bugs are identified before doing so, so that the changes can be
verified to have had the desired effect.
The following members should likely be changed from an int to a float, and
initialized from font metrics to full precision:
* org.netbeans.editor.EditorUI.defaultSpaceWidth
* org.netbeans.modules.editor.lib.drawing.DrawEngine.spaceWidth,
defaultSpaceWidth, and possibly fragmentWidth
* org.netbeans.modules.editor.lib.drawing.DrawGraphics.defaultSpaceWidth
These changes will propagate to related APIs.
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