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gimp/plug-ins/MapObject/mapobject_preview.c

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/*************************************************/
/* Compute a preview image and preview wireframe */
/*************************************************/
#include "mapobject_preview.h"
line linetab[WIRESIZE*2+8];
gdouble mat[3][4];
gint lightx,lighty;
BackBuffer backbuf={0,0,0,0,NULL};
/* Protos */
/* ====== */
void update_light (gint xpos,gint ypos);
void draw_light_marker (gint xpos,gint ypos);
void clear_light_marker (void);
gint draw_line (gint n, gint startx,gint starty,gint pw,gint ph,
gdouble cx1, gdouble cy1, gdouble cx2, gdouble cy2,
GckVector3 a,GckVector3 b);
void draw_wireframe_plane (gint startx,gint starty,gint pw,gint ph);
void draw_wireframe_sphere (gint startx,gint starty,gint pw,gint ph);
void draw_wireframe_box (gint startx,gint starty,gint pw,gint ph);
void draw_wireframe_cylinder (gint startx,gint starty,gint pw,gint ph);
void clear_wireframe (void);
/**************************************************************/
/* Computes a preview of the rectangle starting at (x,y) with */
/* dimensions (w,h), placing the result in preview_RGB_data. */
/**************************************************************/
void compute_preview(gint x,gint y,gint w,gint h,gint pw,gint ph)
{
gdouble xpostab[PREVIEW_WIDTH],ypostab[PREVIEW_HEIGHT],realw,realh;
GckVector3 p1,p2;
GckRGB color,lightcheck,darkcheck,temp;
guchar r,g,b;
gint xcnt,ycnt,f1,f2;
glong index=0;
init_compute();
p1=int_to_pos(x,y);
p2=int_to_pos(x+w,y+h);
/* First, compute the linear mapping (x,y,x+w,y+h) to (0,0,pw,ph) */
/* ============================================================== */
realw=(p2.x-p1.x);
realh=(p2.y-p1.y);
for (xcnt=0;xcnt<pw;xcnt++)
xpostab[xcnt]=p1.x+realw*((double)xcnt/(double)pw);
for (ycnt=0;ycnt<ph;ycnt++)
ypostab[ycnt]=p1.y+realh*((double)ycnt/(double)ph);
/* Compute preview using the offset tables */
/* ======================================= */
if (mapvals.transparent_background==TRUE)
gck_rgba_set(&background,0.0,0.0,0.0,0.0);
else
{
gimp_palette_get_background(&r,&g,&b);
background.r=(gdouble)r/255.0;
background.g=(gdouble)g/255.0;
background.b=(gdouble)b/255.0;
background.a=1.0;
}
gck_rgb_set(&lightcheck,0.75,0.75,0.75);
gck_rgb_set(&darkcheck, 0.50,0.50,0.50);
gck_vector3_set(&p2,-1.0,-1.0,0.0);
for (ycnt=0;ycnt<ph;ycnt++)
{
for (xcnt=0;xcnt<pw;xcnt++)
{
p1.x=xpostab[xcnt];
p1.y=ypostab[ycnt];
p2=p1;
color=(*get_ray_color)(&p1);
if (color.a<1.0)
{
f1=((xcnt % 32)<16);
f2=((ycnt % 32)<16);
f1=f1^f2;
if (f1)
{
if (color.a==0.0)
color=lightcheck;
else
{
gck_rgb_mul(&color,color.a);
temp=lightcheck;
gck_rgb_mul(&temp,1.0-color.a);
gck_rgb_add(&color,&temp);
}
}
else
{
if (color.a==0.0)
color=darkcheck;
else
{
gck_rgb_mul(&color,color.a);
temp=darkcheck;
gck_rgb_mul(&temp,1.0-color.a);
gck_rgb_add(&color,&temp);
}
}
}
preview_rgb_data[index++]=(guchar)(color.r*255.0);
preview_rgb_data[index++]=(guchar)(color.g*255.0);
preview_rgb_data[index++]=(guchar)(color.b*255.0);
}
}
/* Convert to visual type */
/* ====================== */
gck_rgb_to_gdkimage(appwin->visinfo,preview_rgb_data,image,pw,ph);
}
/*************************************************/
/* Check if the given position is within the */
/* light marker. Return TRUE if so, FALSE if not */
/*************************************************/
gint check_light_hit(gint xpos,gint ypos)
{
gdouble dx,dy,r;
if (mapvals.lightsource.type==POINT_LIGHT)
{
dx=(gdouble)lightx-xpos;
dy=(gdouble)lighty-ypos;
r=sqrt(dx*dx+dy*dy)+0.5;
if ((gint)r>7)
return(FALSE);
else
return(TRUE);
}
return(FALSE);
}
/****************************************/
/* Draw a marker to show light position */
/****************************************/
void draw_light_marker(gint xpos,gint ypos)
{
gck_gc_set_foreground(appwin->visinfo,gc,0,50,255);
gck_gc_set_background(appwin->visinfo,gc,0,0,0);
gdk_gc_set_function(gc,GDK_COPY);
if (mapvals.lightsource.type==POINT_LIGHT)
{
lightx=xpos;
lighty=ypos;
/* Save background */
/* =============== */
backbuf.x=lightx-7;
backbuf.y=lighty-7;
backbuf.w=14;
backbuf.h=14;
/* X doesn't like images that's outside a window, make sure */
/* we get the backbuffer image from within the boundaries */
/* ======================================================== */
if (backbuf.x<0)
backbuf.x=0;
else if ((backbuf.x+backbuf.w)>PREVIEW_WIDTH)
backbuf.w=(PREVIEW_WIDTH-backbuf.x);
if (backbuf.y<0)
backbuf.y=0;
else if ((backbuf.y+backbuf.h)>PREVIEW_HEIGHT)
backbuf.h=(PREVIEW_WIDTH-backbuf.y);
backbuf.image=gdk_image_get(previewarea->window,backbuf.x,backbuf.y,backbuf.w,backbuf.h);
gdk_draw_arc(previewarea->window,gc,TRUE,lightx-7,lighty-7,14,14,0,360*64);
}
}
void clear_light_marker()
{
/* Restore background if it has been saved */
/* ======================================= */
if (backbuf.image!=NULL)
{
gck_gc_set_foreground(appwin->visinfo,gc,255,255,255);
gck_gc_set_background(appwin->visinfo,gc,0,0,0);
gdk_gc_set_function(gc,GDK_COPY);
gdk_draw_image(previewarea->window,gc,backbuf.image,0,0,backbuf.x,backbuf.y,
backbuf.w,backbuf.h);
gdk_image_destroy(backbuf.image);
backbuf.image=NULL;
}
}
void draw_lights(gint startx,gint starty,gint pw,gint ph)
{
gdouble dxpos,dypos;
gint xpos,ypos;
clear_light_marker();
gck_3d_to_2d(startx,starty,pw,ph,&dxpos,&dypos,&mapvals.viewpoint,
&mapvals.lightsource.position);
xpos=(gint)(dxpos+0.5);
ypos=(gint)(dypos+0.5);
if (xpos>=0 && xpos<=PREVIEW_WIDTH && ypos>=0 && ypos<=PREVIEW_HEIGHT)
draw_light_marker(xpos,ypos);
}
/*************************************************/
/* Update light position given new screen coords */
/*************************************************/
void update_light(gint xpos,gint ypos)
{
gint startx,starty,pw,ph;
pw=PREVIEW_WIDTH >> mapvals.preview_zoom_factor;
ph=PREVIEW_HEIGHT >> mapvals.preview_zoom_factor;
startx=(PREVIEW_WIDTH-pw)>>1;
starty=(PREVIEW_HEIGHT-ph)>>1;
gck_2d_to_3d(startx,starty,pw,ph,xpos,ypos,&mapvals.viewpoint,&mapvals.lightsource.position);
draw_lights(startx,starty,pw,ph);
}
/******************************************************************/
/* Draw preview image. if DoCompute is TRUE then recompute image. */
/******************************************************************/
void draw_preview_image(gint docompute)
{
gint startx,starty,pw,ph;
gck_gc_set_foreground(appwin->visinfo,gc,255,255,255);
gck_gc_set_background(appwin->visinfo,gc,0,0,0);
gdk_gc_set_function(gc,GDK_COPY);
linetab[0].x1=-1;
pw=PREVIEW_WIDTH >> mapvals.preview_zoom_factor;
ph=PREVIEW_HEIGHT >> mapvals.preview_zoom_factor;
startx=(PREVIEW_WIDTH-pw)>>1;
starty=(PREVIEW_HEIGHT-ph)>>1;
if (docompute==TRUE)
{
gck_cursor_set(previewarea->window,GDK_WATCH);
compute_preview(0,0,width-1,height-1,pw,ph);
gck_cursor_set(previewarea->window,GDK_HAND2);
clear_light_marker();
}
if (pw!=PREVIEW_WIDTH)
gdk_window_clear(previewarea->window);
gdk_draw_image(previewarea->window,gc,image,0,0,startx,starty,pw,ph);
draw_lights(startx,starty,pw,ph);
}
/**************************/
/* Draw preview wireframe */
/**************************/
void draw_preview_wireframe(void)
{
gint startx,starty,pw,ph;
gck_gc_set_foreground(appwin->visinfo,gc,255,255,255);
gck_gc_set_background(appwin->visinfo,gc,0,0,0);
gdk_gc_set_function(gc,GDK_INVERT);
pw=PREVIEW_WIDTH >> mapvals.preview_zoom_factor;
ph=PREVIEW_HEIGHT >> mapvals.preview_zoom_factor;
startx=(PREVIEW_WIDTH-pw)>>1;
starty=(PREVIEW_HEIGHT-ph)>>1;
clear_wireframe();
draw_wireframe(startx,starty,pw,ph);
}
/****************************/
/* Draw a wireframe preview */
/****************************/
void draw_wireframe(gint startx,gint starty,gint pw,gint ph)
{
switch (mapvals.maptype)
{
case MAP_PLANE:
draw_wireframe_plane(startx,starty,pw,ph);
break;
case MAP_SPHERE:
draw_wireframe_sphere(startx,starty,pw,ph);
break;
case MAP_BOX:
draw_wireframe_box(startx,starty,pw,ph);
break;
case MAP_CYLINDER:
draw_wireframe_cylinder(startx,starty,pw,ph);
break;
}
}
void draw_wireframe_plane(gint startx,gint starty,gint pw,gint ph)
{
GckVector3 v1,v2,a,b,c,d,dir1,dir2;
gint cnt,n=0;
gdouble x1,y1,x2,y2,cx1,cy1,cx2,cy2,fac;
/* Find rotated box corners */
/* ======================== */
gck_vector3_set(&v1,0.5,0.0,0.0);
gck_vector3_set(&v2,0.0,0.5,0.0);
gck_vector3_rotate(&v1,gck_deg_to_rad(mapvals.alpha),
gck_deg_to_rad(mapvals.beta),gck_deg_to_rad(mapvals.gamma));
gck_vector3_rotate(&v2,gck_deg_to_rad(mapvals.alpha),
gck_deg_to_rad(mapvals.beta),gck_deg_to_rad(mapvals.gamma));
dir1=v1; gck_vector3_normalize(&dir1);
dir2=v2; gck_vector3_normalize(&dir2);
fac=1.0/(gdouble)WIRESIZE;
gck_vector3_mul(&dir1,fac);
gck_vector3_mul(&dir2,fac);
gck_vector3_add(&a,&mapvals.position,&v1);
gck_vector3_sub(&b,&a,&v2);
gck_vector3_add(&a,&a,&v2);
gck_vector3_sub(&d,&mapvals.position,&v1);
gck_vector3_sub(&d,&d,&v2);
c=b;
cx1=(gdouble)startx;
cy1=(gdouble)starty;
cx2=cx1+(gdouble)pw;
cy2=cy1+(gdouble)ph;
for (cnt=0;cnt<=WIRESIZE;cnt++)
{
gck_3d_to_2d(startx,starty,pw,ph,&x1,&y1,&mapvals.viewpoint,&a);
gck_3d_to_2d(startx,starty,pw,ph,&x2,&y2,&mapvals.viewpoint,&b);
if (gck_clip_line(&x1,&y1,&x2,&y2,cx1,cy1,cx2,cy2)==TRUE)
{
linetab[n].x1=(gint)(x1+0.5);
linetab[n].y1=(gint)(y1+0.5);
linetab[n].x2=(gint)(x2+0.5);
linetab[n].y2=(gint)(y2+0.5);
linetab[n].linewidth=1;
linetab[n].linestyle=GDK_LINE_SOLID;
gdk_gc_set_line_attributes(gc,linetab[n].linewidth,linetab[n].linestyle,GDK_CAP_NOT_LAST,GDK_JOIN_MITER);
gdk_draw_line(previewarea->window,gc,linetab[n].x1,linetab[n].y1,linetab[n].x2,linetab[n].y2);
n++;
}
gck_3d_to_2d(startx,starty,pw,ph,&x1,&y1,&mapvals.viewpoint,&c);
gck_3d_to_2d(startx,starty,pw,ph,&x2,&y2,&mapvals.viewpoint,&d);
if (gck_clip_line(&x1,&y1,&x2,&y2,cx1,cy1,cx2,cy2)==TRUE)
{
linetab[n].x1=(gint)(x1+0.5);
linetab[n].y1=(gint)(y1+0.5);
linetab[n].x2=(gint)(x2+0.5);
linetab[n].y2=(gint)(y2+0.5);
linetab[n].linewidth=1;
linetab[n].linestyle=GDK_LINE_SOLID;
gdk_gc_set_line_attributes(gc,linetab[n].linewidth,linetab[n].linestyle,GDK_CAP_NOT_LAST,GDK_JOIN_MITER);
gdk_draw_line(previewarea->window,gc,linetab[n].x1,linetab[n].y1,linetab[n].x2,linetab[n].y2);
n++;
}
gck_vector3_sub(&a,&a,&dir1);
gck_vector3_sub(&b,&b,&dir1);
gck_vector3_add(&c,&c,&dir2);
gck_vector3_add(&d,&d,&dir2);
}
/* Mark end of lines */
/* ================= */
linetab[n].x1=-1;
}
void draw_wireframe_sphere(gint startx,gint starty,gint pw,gint ph)
{
GckVector3 p[2*(WIRESIZE+5)];
gint cnt,cnt2,n=0;
gdouble x1,y1,x2,y2,twopifac,cx1,cy1,cx2,cy2;
/* Compute wireframe points */
/* ======================== */
twopifac=(2.0*M_PI)/WIRESIZE;
for (cnt=0;cnt<WIRESIZE;cnt++)
{
p[cnt].x=mapvals.radius*cos((gdouble)cnt*twopifac);
p[cnt].y=0.0;
p[cnt].z=mapvals.radius*sin((gdouble)cnt*twopifac);
gck_vector3_rotate(&p[cnt],gck_deg_to_rad(mapvals.alpha),
gck_deg_to_rad(mapvals.beta),gck_deg_to_rad(mapvals.gamma));
gck_vector3_add(&p[cnt],&p[cnt],&mapvals.position);
}
p[cnt]=p[0];
for (cnt=WIRESIZE+1;cnt<2*WIRESIZE+1;cnt++)
{
p[cnt].x=mapvals.radius*cos((gdouble)(cnt-(WIRESIZE+1))*twopifac);
p[cnt].y=mapvals.radius*sin((gdouble)(cnt-(WIRESIZE+1))*twopifac);
p[cnt].z=0.0;
gck_vector3_rotate(&p[cnt],gck_deg_to_rad(mapvals.alpha),
gck_deg_to_rad(mapvals.beta),gck_deg_to_rad(mapvals.gamma));
gck_vector3_add(&p[cnt],&p[cnt],&mapvals.position);
}
p[cnt]=p[WIRESIZE+1];
cnt++;
cnt2=cnt;
/* Find rotated axis */
/* ================= */
gck_vector3_set(&p[cnt],0.0,-0.35,0.0);
gck_vector3_rotate(&p[cnt],gck_deg_to_rad(mapvals.alpha),
gck_deg_to_rad(mapvals.beta),gck_deg_to_rad(mapvals.gamma));
p[cnt+1]=mapvals.position;
gck_vector3_set(&p[cnt+2],0.0,0.0,-0.35);
gck_vector3_rotate(&p[cnt+2],gck_deg_to_rad(mapvals.alpha),
gck_deg_to_rad(mapvals.beta),gck_deg_to_rad(mapvals.gamma));
p[cnt+3]=mapvals.position;
p[cnt+4]=p[cnt];
gck_vector3_mul(&p[cnt+4],-1.0);
p[cnt+5]=p[cnt+1];
gck_vector3_add(&p[cnt],&p[cnt],&mapvals.position);
gck_vector3_add(&p[cnt+2],&p[cnt+2],&mapvals.position);
gck_vector3_add(&p[cnt+4],&p[cnt+4],&mapvals.position);
/* Draw the circles (equator and zero meridian) */
/* ============================================ */
cx1=(gdouble)startx;
cy1=(gdouble)starty;
cx2=cx1+(gdouble)pw;
cy2=cy1+(gdouble)ph;
for (cnt=0;cnt<cnt2-1;cnt++)
{
if (p[cnt].z>mapvals.position.z && p[cnt+1].z>mapvals.position.z)
{
gck_3d_to_2d(startx,starty,pw,ph,&x1,&y1,&mapvals.viewpoint,&p[cnt]);
gck_3d_to_2d(startx,starty,pw,ph,&x2,&y2,&mapvals.viewpoint,&p[cnt+1]);
if (gck_clip_line(&x1,&y1,&x2,&y2,cx1,cy1,cx2,cy2)==TRUE)
{
linetab[n].x1=(gint)(x1+0.5);
linetab[n].y1=(gint)(y1+0.5);
linetab[n].x2=(gint)(x2+0.5);
linetab[n].y2=(gint)(y2+0.5);
linetab[n].linewidth=3;
linetab[n].linestyle=GDK_LINE_SOLID;
gdk_gc_set_line_attributes(gc,linetab[n].linewidth,linetab[n].linestyle,GDK_CAP_NOT_LAST,GDK_JOIN_MITER);
gdk_draw_line(previewarea->window,gc,linetab[n].x1,linetab[n].y1,linetab[n].x2,linetab[n].y2);
n++;
}
}
}
/* Draw the axis (pole to pole and center to zero meridian) */
/* ======================================================== */
for (cnt=0;cnt<3;cnt++)
{
gck_3d_to_2d(startx,starty,pw,ph,&x1,&y1,&mapvals.viewpoint,&p[cnt2]);
gck_3d_to_2d(startx,starty,pw,ph,&x2,&y2,&mapvals.viewpoint,&p[cnt2+1]);
if (gck_clip_line(&x1,&y1,&x2,&y2,cx1,cy1,cx2,cy2)==TRUE)
{
linetab[n].x1=(gint)(x1+0.5);
linetab[n].y1=(gint)(y1+0.5);
linetab[n].x2=(gint)(x2+0.5);
linetab[n].y2=(gint)(y2+0.5);
if (p[cnt2].z<mapvals.position.z || p[cnt2+1].z<mapvals.position.z)
{
linetab[n].linewidth=1;
linetab[n].linestyle=GDK_LINE_DOUBLE_DASH;
}
else
{
linetab[n].linewidth=3;
linetab[n].linestyle=GDK_LINE_SOLID;
}
gdk_gc_set_line_attributes(gc,linetab[n].linewidth,linetab[n].linestyle,GDK_CAP_NOT_LAST,GDK_JOIN_MITER);
gdk_draw_line(previewarea->window,gc,linetab[n].x1,linetab[n].y1,linetab[n].x2,linetab[n].y2);
n++;
}
cnt2+=2;
}
/* Mark end of lines */
/* ================= */
linetab[n].x1=-1;
}
gint draw_line(gint n, gint startx,gint starty,gint pw,gint ph,
gdouble cx1, gdouble cy1, gdouble cx2, gdouble cy2,
GckVector3 a,GckVector3 b)
{
gdouble x1,y1,x2,y2;
gint i = n;
gck_3d_to_2d(startx,starty,pw,ph,&x1,&y1,&mapvals.viewpoint,&a);
gck_3d_to_2d(startx,starty,pw,ph,&x2,&y2,&mapvals.viewpoint,&b);
if (gck_clip_line(&x1,&y1,&x2,&y2,cx1,cy1,cx2,cy2)==TRUE)
{
linetab[i].x1=(gint)(x1+0.5);
linetab[i].y1=(gint)(y1+0.5);
linetab[i].x2=(gint)(x2+0.5);
linetab[i].y2=(gint)(y2+0.5);
linetab[i].linewidth=3;
linetab[i].linestyle=GDK_LINE_SOLID;
gdk_gc_set_line_attributes(gc,linetab[i].linewidth,linetab[i].linestyle,
GDK_CAP_NOT_LAST,GDK_JOIN_MITER);
gdk_draw_line(previewarea->window,gc,linetab[i].x1,linetab[i].y1,
linetab[i].x2,linetab[i].y2);
i++;
}
return(i);
}
void draw_wireframe_box(gint startx,gint starty,gint pw,gint ph)
{
GckVector3 p[8], tmp, scale;
gint n=0,i;
gdouble cx1,cy1,cx2,cy2;
/* Compute wireframe points */
/* ======================== */
init_compute();
scale = mapvals.scale;
gck_vector3_mul(&scale,0.5);
gck_vector3_set(&p[0], -scale.x, -scale.y, scale.z);
gck_vector3_set(&p[1], scale.x, -scale.y, scale.z);
gck_vector3_set(&p[2], scale.x, scale.y, scale.z);
gck_vector3_set(&p[3], -scale.x, scale.y, scale.z);
gck_vector3_set(&p[4], -scale.x, -scale.y, -scale.z);
gck_vector3_set(&p[5], scale.x, -scale.y, -scale.z);
gck_vector3_set(&p[6], scale.x, scale.y, -scale.z);
gck_vector3_set(&p[7], -scale.x, scale.y, -scale.z);
/* Rotate and translate points */
/* =========================== */
for (i=0;i<8;i++)
{
vecmulmat(&tmp,&p[i],rotmat);
gck_vector3_add(&p[i],&tmp,&mapvals.position);
}
/* Draw the box */
/* ============ */
cx1=(gdouble)startx;
cy1=(gdouble)starty;
cx2=cx1+(gdouble)pw;
cy2=cy1+(gdouble)ph;
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[0],p[1]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[1],p[2]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[2],p[3]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[3],p[0]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[4],p[5]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[5],p[6]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[6],p[7]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[7],p[4]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[0],p[4]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[1],p[5]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[2],p[6]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[3],p[7]);
/* Mark end of lines */
/* ================= */
linetab[n].x1=-1;
}
void draw_wireframe_cylinder(gint startx,gint starty,gint pw,gint ph)
{
GckVector3 p[2*8], a, axis, scale;
gint n=0,i;
gdouble cx1,cy1,cx2,cy2;
gfloat m[16], l, angle;
/* Compute wireframe points */
/* ======================== */
init_compute();
scale = mapvals.scale;
gck_vector3_mul(&scale,0.5);
l = mapvals.cylinder_length/2.0;
angle = 0;
gck_vector3_set(&axis, 0.0,1.0,0.0);
for (i=0;i<8;i++)
{
rotatemat(angle, &axis, m);
gck_vector3_set(&a, mapvals.cylinder_radius,0.0,0.0);
vecmulmat(&p[i], &a, m);
p[i+8] = p[i];
p[i].y += l;
p[i+8].y -= l;
angle += 360.0/8.0;
}
/* Rotate and translate points */
/* =========================== */
for (i=0;i<16;i++)
{
vecmulmat(&a,&p[i],rotmat);
gck_vector3_add(&p[i],&a,&mapvals.position);
}
/* Draw the box */
/* ============ */
cx1=(gdouble)startx;
cy1=(gdouble)starty;
cx2=cx1+(gdouble)pw;
cy2=cy1+(gdouble)ph;
for (i=0;i<7;i++)
{
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[i],p[i+1]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[i+8],p[i+9]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[i],p[i+8]);
}
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[7],p[0]);
n = draw_line(n, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[15],p[8]);
/* Mark end of lines */
/* ================= */
linetab[n].x1=-1;
}
void clear_wireframe(void)
{
gint n=0;
while (linetab[n].x1!=-1)
{
gdk_gc_set_line_attributes(gc,linetab[n].linewidth,linetab[n].linestyle,GDK_CAP_NOT_LAST,GDK_JOIN_MITER);
gdk_draw_line(previewarea->window,gc,linetab[n].x1,linetab[n].y1,
linetab[n].x2,linetab[n].y2);
n++;
}
}
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