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xeyes/transform.c
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/* | |
* transformed coordinate system objects for X | |
*/ | |
# 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; | |
} |