Details
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Type:
Bug
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Status:
Analysis
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Priority:
Major
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Resolution: Unresolved
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Affects Version/s: UDIG 1.1.RC1, UDIG 1.2.M2
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Fix Version/s: UDIG 1.4.1
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Component/s: visualization using map layer and style
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Labels:None
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Environment:SWT enabled OSes (ie, Not Linux)
Description
SWTGraphics.paint( Shape s) uses GC.drawPath() to render a Feature. If that feature is a line that has a small 'kink' or 'zig-zag' in it the line can be rendered incorrectly. See attached screenshot.
Adding gc.setLineJoin(SWT.JOIN_ROUND) to the draw command fixes this. The problem is that the default style of JOIN_MITER leaves a big long pointy exterior on the outside of the corner where the line turns back on itself.
Here is the patch that I used to correct this issue:
public void draw( Shape s ) {
if( Display.getCurrent() == null )
SWT.error (SWT.ERROR_THREAD_INVALID_ACCESS);
Path path = convertToPath(s, display);
if( path!=null )
}
Images:
1. snapshot21 - what it should look like
2. snapshot22 - what it does look like with line join of miter
3. snapshot23 - the offending piece of data
