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/*
* transformed coordinate system objects for X
*/
/* $XFree86: xc/programs/xeyes/transform.c,v 1.3 2000/02/17 14:00:35 dawes Exp $ */
# include <X11/Xos.h>
# include <stdlib.h>
# include <X11/Xlib.h>
# include "transform.h"
#if 0
static XPoint *
TranslatePoints (TPoint *points, int n_points, Transform *t, int mode)
{
XPoint *xpoints;
int i;
double xoff = 0.0, yoff = 0.0;
xpoints = (XPoint *) malloc (n_points * sizeof (*xpoints));
if (!xpoints)
return NULL;
for (i = 0; i < n_points; i++) {
xpoints[i].x = Xx(points[i].x + xoff, points[i].y + yoff, t);
xpoints[i].y = Xy(points[i].x + xoff, points[i].y + yoff, t);
if (mode == CoordModePrevious) {
xoff += points[i].x;
yoff += points[i].y;
}
}
return xpoints;
}
static void
TFillPolygon (
Display *dpy,
Drawable d,
GC gc,
Transform *t,
TPoint *points,
int n_points,
int shape,
int mode)
{
XPoint *xpoints;
xpoints = TranslatePoints (points, n_points, t, mode);
if (xpoints) {
XFillPolygon (dpy, d, gc, xpoints, n_points, shape,
CoordModeOrigin);
free (xpoints);
}
}
static void
TDrawArc (
Display *dpy,
Drawable d,
GC gc,
Transform *t,
double x,
double y,
double width,
double height,
int angle1,
int angle2)
{
int xx, xy, xw, xh;
xx = Xx(x,y,t);
xy = Xy(x,y,t);
xw = Xwidth (width, height, t);
xh = Xheight (width, height, t);
if (xw < 0) {
xx += xw;
xw = -xw;
}
if (xh < 0) {
xy += xh;
xh = -xh;
}
XDrawArc (dpy, d, gc, xx, xy, xw, xh, angle1, angle2);
}
#endif
void
Trectangle(const Transform *t, const TRectangle *i, TRectangle *o)
{
o->x = t->mx * i->x + t->bx;
o->y = t->my * i->y + t->by;
o->width = t->mx * i->width;
o->height = t->my * i->height;
if (o->width < 0) {
o->x += o->width;
o->width = -o->width;
}
if (o->height < 0) {
o->y += o->height;
o->height = -o->height;
}
}
void
SetTransform (Transform *t,
int xx1, int xx2, int xy1, int xy2,
double tx1, double tx2, double ty1, double ty2)
{
t->mx = ((double) xx2 - xx1) / (tx2 - tx1);
t->bx = ((double) xx1) - t->mx * tx1;
t->my = ((double) xy2 - xy1) / (ty2 - ty1);
t->by = ((double) xy1) - t->my * ty1;
}
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