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#include "gedit.h"
#include <math.h>
#define NUM_POINTS 12
extern polygon_t *BeginPolygon();
extern void PointToXYZ();
static point_t drag;
void
ScaleCircle(p, poly, scale)
view_info_t *p;
polygon_t *poly;
double scale;
{
double a = 0.0, a_incr = M_PI * 2.0 / NUM_POINTS;
double other = 0.0, ocos, osin;
int i;
for (i=0; i<NUM_POINTS; ++i) {
osin = sin (a);
ocos = cos (a);
poly->point[i] = drag;
switch (p->layout) {
case VL_NYX:
case VL_NXNY:
poly->point[i].point.x += osin * scale;
poly->point[i].point.y += ocos * scale;
poly->point[i].point.z += other;
break;
case VL_NYZ:
poly->point[i].point.x += other;
poly->point[i].point.y += ocos * scale;
poly->point[i].point.z += osin * scale;
break;
case VL_NXZ:
poly->point[i].point.x += osin * scale;
poly->point[i].point.y += other;
poly->point[i].point.z += ocos * scale;
break;
default:
poly->point[i].point.x += osin * scale;
poly->point[i].point.y += ocos * scale;
poly->point[i].point.z += other;
break;
}
a += a_incr;
PointToXYZ (p, &poly->point[i]);
}
if (scale > 0.0) {
ComputePlaneEquation (poly);
}
}
void
BeginCirclePoint (w, p, x, y)
Widget w;
view_info_t *p;
int x, y;
{
polygon_t *poly;
poly = BeginPolygon();
poly->num_points = NUM_POINTS;
drag_origin.x = x;
drag_origin.y = y;
PointXY (w, p, x, y, &drag);
ScaleCircle (p, poly, 0.0);
}
void
DragCirclePoint(w, p, x, y)
Widget w;
view_info_t *p;
int x, y;
{
double dx = x - drag_origin.x, dy = y - drag_origin.y;
double scale = sqrt (dx * dx + dy * dy) * pixel_scale;
Display *dpy = XtDisplay(w);
XSetFunction (dpy, p->gc, GXxor);
XSetFunction (dpy, p->other_view->gc, GXxor);
DrawPolygon (w, cur_polygon, True);
DrawPolygon (p->other_widget, cur_polygon, True);
ScaleCircle (p, cur_polygon, scale);
DrawPolygon (w, cur_polygon, True);
DrawPolygon (p->other_widget, cur_polygon, True);
XSetFunction (dpy, p->gc, GXcopy);
XSetFunction (dpy, p->other_view->gc, GXcopy);
}
void
CompleteCirclePoint(w, p, x, y)
Widget w;
view_info_t *p;
int x, y;
{
CompletePolygon (w, cur_polygon);
}
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