129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/* $Xorg: transform.c,v 1.4 2001/02/09 02:05:33 xorgcvs Exp $ */
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/*
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Copyright 1993, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/* $XFree86: xc/programs/oclock/transform.c,v 3.4 2001/07/25 15:05:15 dawes Exp $ */
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/*
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* transformed coordinate system objects for X
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*/
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#include <X11/Xlib.h>
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#include "transform.h"
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#include <stdlib.h>
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static XPoint *
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TranslatePoints(TPoint *points, int n_points,
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Transform *t, int mode)
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{
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XPoint *xpoints;
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int i;
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double xoff = 0.0, yoff = 0.0;
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xpoints = (XPoint *) malloc ((unsigned)n_points * sizeof (*xpoints));
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if (!xpoints)
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return NULL;
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for (i = 0; i < n_points; i++) {
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xpoints[i].x = Xx(points[i].x + xoff, points[i].y + yoff, t);
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xpoints[i].y = Xy(points[i].x + xoff, points[i].y + yoff, t);
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if (mode == CoordModePrevious) {
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xoff += points[i].x;
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yoff += points[i].y;
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}
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}
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return xpoints;
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}
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void
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TFillPolygon (register Display *dpy, Drawable d, GC gc, Transform *t,
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TPoint *points, int n_points, int shape, int mode)
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{
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XPoint *xpoints;
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xpoints = TranslatePoints (points, n_points, t, mode);
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if (xpoints) {
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XFillPolygon (dpy, d, gc, xpoints, n_points, shape,
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CoordModeOrigin);
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free (xpoints);
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}
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}
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void
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TDrawArc (register Display *dpy, Drawable d, GC gc, Transform *t,
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double x, double y, double width, double height,
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int angle1, int angle2)
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{
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int xx, xy, xw, xh;
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xx = Xx(x,y,t);
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xy = Xy(x,y,t);
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xw = Xwidth (width, height, t);
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xh = Xheight (width, height, t);
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if (xw < 0) {
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xx += xw;
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xw = -xw;
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}
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if (xh < 0) {
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xy += xh;
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xh = -xh;
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}
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XDrawArc (dpy, d, gc, xx, xy, xw, xh, angle1, angle2);
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}
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void
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TFillArc (register Display *dpy, Drawable d, GC gc, Transform *t,
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double x, double y, double width, double height,
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int angle1, int angle2)
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{
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int xx, xy, xw, xh;
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xx = Xx(x,y,t);
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xy = Xy(x,y,t);
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xw = Xwidth (width, height, t);
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xh = Xheight (width, height, t);
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if (xw < 0) {
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xx += xw;
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xw = -xw;
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}
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if (xh < 0) {
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xy += xh;
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xh = -xh;
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}
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XFillArc (dpy, d, gc, xx, xy, xw, xh, angle1, angle2);
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}
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void
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SetTransform (Transform *t, int xx1, int xx2, int xy1, int xy2,
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double tx1, double tx2, double ty1, double ty2)
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{
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t->mx = ((double) xx2 - xx1) / (tx2 - tx1);
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t->bx = ((double) xx1) - t->mx * tx1;
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t->my = ((double) xy2 - xy1) / (ty2 - ty1);
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t->by = ((double) xy1) - t->my * ty1;
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}
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