diff options
Diffstat (limited to 'generic/tkCanvUtil.c')
| -rw-r--r-- | generic/tkCanvUtil.c | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/generic/tkCanvUtil.c b/generic/tkCanvUtil.c index 129e63f..5a8381a 100644 --- a/generic/tkCanvUtil.c +++ b/generic/tkCanvUtil.c @@ -10,7 +10,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tkCanvUtil.c,v 1.9 2003/01/08 23:02:30 drh Exp $ + * RCS: @(#) $Id: tkCanvUtil.c,v 1.10 2003/01/17 19:54:09 drh Exp $ */ #include "tkInt.h" @@ -1582,18 +1582,27 @@ TkCanvTranslatePath (canvPtr, numVertex, coordArr, closedPath, outArr) double limit[4]; /* Boundries at which clipping occurs */ double staticSpace[480]; /* Temp space from the stack */ - /* Constrain all vertices of the path to be within a box that is 1000 - ** pixels larger than the size of the visible canvas. + /* + ** Constrain all vertices of the path to be within a box that is no + ** larger than 32000 pixels wide or height. The top-left corner of + ** this clipping box is 1000 pixels above and to the left of the top + ** left corner of the window on which the canvas is displayed. + ** + ** This means that a canvas will not display properly on a canvas + ** window that is larger than 31000 pixels wide or high. That is not + ** a problem today, but might someday become a factor for ultra-high + ** resolutions displays. ** - ** The complete canvas is used rather than just the redrawing pixmap, - ** so that the line path will always be the same length. Having the - ** same path length is important if the line is dotted or dashed. + ** The X11 protocol allows us (in theory) to expand the size of the + ** clipping box to 32767 pixels. But we have found experimentally that + ** XFree86 sometimes fails to draw lines correctly if they are longer + ** than about 32500 pixels. So we have left a little margin in the + ** size to mask that bug. */ - assert( canvPtr->tkwin!=NULL ); - lft = canvPtr->xOrigin - 1000; - top = canvPtr->yOrigin - 1000; - rgh = lft + Tk_Width(canvPtr->tkwin) + 2000; - btm = top + Tk_Height(canvPtr->tkwin) + 2000; + lft = canvPtr->xOrigin - 1000.0; + top = canvPtr->yOrigin - 1000.0; + rgh = lft + 32000.0; + btm = top + 32000.0; /* Try the common case first - no clipping. Loop over the input ** coordinates and translate them into appropriate output coordinates. |