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transform.c

/*
 * 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
TFillArc (dpy, d, gc, t, x, y, width, height, angle1, angle2)
    Display *dpy;
    Drawable      d;
    GC            gc;
    Transform     *t;
    double  x, y, width, height;
    int           angle1, 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;
      }
      XFillArc (dpy, d, gc, xx, xy, xw, xh, angle1, angle2);
}

void
SetTransform (t, xx1, xx2, xy1, xy2, tx1, tx2, ty1, ty2)
    Transform     *t;
    int           xx1, xx2, xy1, xy2;
    double  tx1, tx2, ty1, 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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