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| author | dkf <donal.k.fellows@manchester.ac.uk> | 2019-03-13 19:16:12 (GMT) |
|---|---|---|
| committer | dkf <donal.k.fellows@manchester.ac.uk> | 2019-03-13 19:16:12 (GMT) |
| commit | 913c2ffec66a261d7cea357c21cdcda60132c0a5 (patch) | |
| tree | 50834dfff8ea8a4494f981b6559bbfa604ee7707 /generic/tkCanvBmap.c | |
| parent | 87a95ec0329c9fd676ed4a5d9d10247eb245a4ec (diff) | |
| download | tk-913c2ffec66a261d7cea357c21cdcda60132c0a5.zip tk-913c2ffec66a261d7cea357c21cdcda60132c0a5.tar.gz tk-913c2ffec66a261d7cea357c21cdcda60132c0a5.tar.bz2 | |
Document. Factor out basic rotation function.
Diffstat (limited to 'generic/tkCanvBmap.c')
| -rw-r--r-- | generic/tkCanvBmap.c | 13 |
1 files changed, 3 insertions, 10 deletions
diff --git a/generic/tkCanvBmap.c b/generic/tkCanvBmap.c index 948379d..34c74f3 100644 --- a/generic/tkCanvBmap.c +++ b/generic/tkCanvBmap.c @@ -817,16 +817,9 @@ RotateBitmap( double angleRad) { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; - double x, y, nx, ny; - double s = sin(angleRad); - double c = cos(angleRad); - - x = bmapPtr->x - originX; - y = bmapPtr->y - originY; - nx = x * c - y * s; - ny = x * s + y * c; - bmapPtr->x = nx + originX; - bmapPtr->y = ny + originY; + + TkRotatePoint(originX, originY, sin(angleRad), cos(angleRad), + &bmapPtr->x, &bmapPtr->y); ComputeBitmapBbox(canvas, bmapPtr); } |