[GRASS-dev] [grass-code patches][283] Fix gis.m canvas division by zero on zoom-in and other enhancements

[grass-codepatches at wald.intevation.org]

code patches item #283, was opened at 2007-02-11 15:18
Status: Open
Priority: 3
Submitted By: Māris Nartišs (marisn)
Assigned to: Nobody (None)
Summary: Fix gis.m canvas division by zero on zoom-in and other enhancements 
Patch status: None
Patch type: fix
GRASS component: gis.m
GRASS version: CVS HEAD
GRASS CVS checkout date, if applies (YYMMDD): 070211


Initial Comment:
This patch fixes following bugs and usability problems:
* If user zooms too far in, it gets prompt about it and not about division by zero (this should be enhanced more to promt to user sooner than map width exceeds resolution);
* Warning if user querys map but has no layer selected;
* Zoom in/out by rectangle now draws black/yellow dashed rectangle as pure yellow was not visible on yellow maps;
* If user zooms in/out by rectangle and has moved mouse for less than 15 pixels, it is asumed to be a click. Prevents users from zooming in/out too much by accident;
* Measure tool now works also by single cilck like in other GIS apps (QGIS, ArcView etc.). Old style (by draging) also works;
* Warning if user zooms to map but has no map selected.

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