static gint
draw_line (gint n,
gint startx,
gint starty,
gint pw,
gint ph,
gdouble cx1,
gdouble cy1,
gdouble cx2,
gdouble cy2,
GimpVector3 a,
GimpVector3 b)
{
gdouble x1, y1, x2, y2;
gint i = n;
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x1, &y1, &mapvals.viewpoint, &a);
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x2, &y2, &mapvals.viewpoint, &b);
if (clip_line (&x1, &y1, &x2, &y2, cx1, cy1, cx2, cy2) == TRUE)
{
linetab[i].x1 = RINT (x1);
linetab[i].y1 = RINT (y1);
linetab[i].x2 = RINT (x2);
linetab[i].y2 = RINT (y2);
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;
}
static void
draw_lights (gint startx,
gint starty,
gint pw,
gint ph)
{
gdouble dxpos, dypos;
gint xpos, ypos;
clear_light_marker ();
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&dxpos, &dypos, &mapvals.viewpoint,
&mapvals.lightsource.position);
xpos = RINT (dxpos);
ypos = RINT (dypos);
if (xpos >= 0 && xpos <= PREVIEW_WIDTH &&
ypos >= 0 && ypos <= PREVIEW_HEIGHT)
draw_light_marker (xpos, ypos);
}
static void
draw_handles (void)
{
gdouble dxpos, dypos;
gint startx, starty, pw, ph;
GimpVector3 viewpoint;
GimpVector3 light_position;
gint k = mapvals.light_selected;
gfloat length;
gfloat delta_x = 0.0;
gfloat delta_y = 0.0;
/* calculate handle position */
compute_preview_rectangle (&startx, &starty, &pw, &ph);
switch (mapvals.lightsource[k].type)
{
case NO_LIGHT:
return;
case POINT_LIGHT:
case SPOT_LIGHT:
/* swap z to reverse light position */
viewpoint = mapvals.viewpoint;
viewpoint.z = -viewpoint.z;
light_position = mapvals.lightsource[k].position;
gimp_vector_3d_to_2d (startx, starty, pw, ph, &dxpos, &dypos,
&viewpoint, &light_position);
handle_xpos = (gint) (dxpos + 0.5);
handle_ypos = (gint) (dypos + 0.5);
break;
case DIRECTIONAL_LIGHT:
light_position.x = light_position.y = 0.5;
light_position.z = 0;
viewpoint.z = -viewpoint.z;
gimp_vector_3d_to_2d (startx, starty, pw, ph, &dxpos, &dypos,
&viewpoint, &light_position);
length = PREVIEW_HEIGHT / 4;
delta_x = mapvals.lightsource[k].direction.x * length;
delta_y = mapvals.lightsource[k].direction.y * length;
handle_xpos = dxpos + delta_x;
handle_ypos = dypos + delta_y;
break;
}
gdk_gc_set_function (gc, GDK_COPY);
if (mapvals.lightsource[k].type != NO_LIGHT)
{
GdkColor color;
/* Restore background if it has been saved */
/* ======================================= */
if (backbuf.image != NULL)
{
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);
g_object_unref (backbuf.image);
backbuf.image = NULL;
}
/* calculate backbuffer */
switch (mapvals.lightsource[k].type)
{
case POINT_LIGHT:
backbuf.x = handle_xpos - LIGHT_SYMBOL_SIZE / 2;
backbuf.y = handle_ypos - LIGHT_SYMBOL_SIZE / 2;
backbuf.w = LIGHT_SYMBOL_SIZE;
backbuf.h = LIGHT_SYMBOL_SIZE;
break;
case DIRECTIONAL_LIGHT:
if (delta_x <= 0)
backbuf.x = handle_xpos;
else
backbuf.x = startx + pw/2;
if (delta_y <= 0)
backbuf.y = handle_ypos;
else
backbuf.y = starty + ph/2;
backbuf.x -= LIGHT_SYMBOL_SIZE/2;
backbuf.y -= LIGHT_SYMBOL_SIZE/2;
backbuf.w = fabs(delta_x) + LIGHT_SYMBOL_SIZE;
backbuf.h = fabs(delta_y) + LIGHT_SYMBOL_SIZE;
break;
case SPOT_LIGHT:
backbuf.x = handle_xpos - LIGHT_SYMBOL_SIZE / 2;
backbuf.y = handle_ypos - LIGHT_SYMBOL_SIZE / 2;
backbuf.w = LIGHT_SYMBOL_SIZE;
backbuf.h = LIGHT_SYMBOL_SIZE;
break;
case NO_LIGHT:
break;
}
/* Save background */
/* =============== */
if ((backbuf.x >= 0) &&
(backbuf.x <= PREVIEW_WIDTH) &&
(backbuf.y >= 0) && (backbuf.y <= PREVIEW_HEIGHT))
{
/* clip coordinates to preview widget sizes */
if ((backbuf.x + backbuf.w) > PREVIEW_WIDTH)
backbuf.w = (PREVIEW_WIDTH - backbuf.x);
if ((backbuf.y + backbuf.h) > PREVIEW_HEIGHT)
backbuf.h = (PREVIEW_HEIGHT - backbuf.y);
backbuf.image = gdk_drawable_get_image (previewarea->window,
backbuf.x, backbuf.y,
backbuf.w, backbuf.h);
}
color.red = 0x0;
color.green = 0x0;
color.blue = 0x0;
gdk_gc_set_rgb_bg_color (gc, &color);
color.red = 0x0;
color.green = 0x4000;
color.blue = 0xFFFF;
gdk_gc_set_rgb_fg_color (gc, &color);
/* draw circle at light position */
switch (mapvals.lightsource[k].type)
{
case POINT_LIGHT:
case SPOT_LIGHT:
gdk_draw_arc (previewarea->window, gc, TRUE,
handle_xpos - LIGHT_SYMBOL_SIZE / 2,
handle_ypos - LIGHT_SYMBOL_SIZE / 2,
LIGHT_SYMBOL_SIZE,
LIGHT_SYMBOL_SIZE, 0, 360 * 64);
break;
case DIRECTIONAL_LIGHT:
gdk_draw_arc (previewarea->window, gc, TRUE,
handle_xpos - LIGHT_SYMBOL_SIZE / 2,
handle_ypos - LIGHT_SYMBOL_SIZE / 2,
LIGHT_SYMBOL_SIZE,
LIGHT_SYMBOL_SIZE, 0, 360 * 64);
gdk_draw_line (previewarea->window, gc,
handle_xpos, handle_ypos, startx+pw/2 , starty + ph/2);
break;
case NO_LIGHT:
break;
}
}
}
static void
draw_handles (void)
{
gdouble dxpos, dypos;
gint startx, starty, pw, ph;
GimpVector3 viewpoint;
GimpVector3 light_position;
gint k = mapvals.light_selected;
gfloat length;
gfloat delta_x = 0.0;
gfloat delta_y = 0.0;
/* calculate handle position */
compute_preview_rectangle (&startx, &starty, &pw, &ph);
switch (mapvals.lightsource[k].type)
{
case NO_LIGHT:
return;
case POINT_LIGHT:
case SPOT_LIGHT:
/* swap z to reverse light position */
viewpoint = mapvals.viewpoint;
viewpoint.z = -viewpoint.z;
light_position = mapvals.lightsource[k].position;
gimp_vector_3d_to_2d (startx, starty, pw, ph, &dxpos, &dypos,
&viewpoint, &light_position);
handle_xpos = (gint) (dxpos + 0.5);
handle_ypos = (gint) (dypos + 0.5);
break;
case DIRECTIONAL_LIGHT:
light_position.x = light_position.y = 0.5;
light_position.z = 0;
viewpoint.z = -viewpoint.z;
gimp_vector_3d_to_2d (startx, starty, pw, ph, &dxpos, &dypos,
&viewpoint, &light_position);
length = PREVIEW_HEIGHT / 4;
delta_x = mapvals.lightsource[k].direction.x * length;
delta_y = mapvals.lightsource[k].direction.y * length;
handle_xpos = dxpos + delta_x;
handle_ypos = dypos + delta_y;
break;
}
if (mapvals.lightsource[k].type != NO_LIGHT)
{
GdkColor color;
cairo_t *cr;
cr = gdk_cairo_create (gtk_widget_get_window (previewarea));
cairo_set_line_width (cr, 1.0);
color.red = 0x0;
color.green = 0x4000;
color.blue = 0xFFFF;
gdk_cairo_set_source_color (cr, &color);
/* draw circle at light position */
switch (mapvals.lightsource[k].type)
{
case POINT_LIGHT:
case SPOT_LIGHT:
cairo_arc (cr, handle_xpos, handle_ypos,
LIGHT_SYMBOL_SIZE/2, 0, 2 * M_PI);
cairo_fill (cr);
break;
case DIRECTIONAL_LIGHT:
cairo_arc (cr, handle_xpos, handle_ypos,
LIGHT_SYMBOL_SIZE/2, 0, 2 * M_PI);
cairo_fill (cr);
cairo_move_to (cr, handle_xpos, handle_ypos);
cairo_line_to (cr, startx + pw/2, starty + ph/2);
cairo_stroke (cr);
break;
case NO_LIGHT:
break;
}
cairo_destroy (cr);
}
}
static void
draw_wireframe_sphere (gint startx,
gint starty,
gint pw,
gint ph)
{
GimpVector3 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 * G_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);
gimp_vector3_rotate (&p[cnt],
gimp_deg_to_rad (mapvals.alpha),
gimp_deg_to_rad (mapvals.beta),
gimp_deg_to_rad (mapvals.gamma));
gimp_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;
gimp_vector3_rotate (&p[cnt],
gimp_deg_to_rad (mapvals.alpha),
gimp_deg_to_rad (mapvals.beta),
gimp_deg_to_rad (mapvals.gamma));
gimp_vector3_add (&p[cnt], &p[cnt], &mapvals.position);
}
p[cnt] = p[WIRESIZE+1];
cnt++;
cnt2 = cnt;
/* Find rotated axis */
/* ================= */
gimp_vector3_set (&p[cnt], 0.0, -0.35, 0.0);
gimp_vector3_rotate (&p[cnt],
gimp_deg_to_rad (mapvals.alpha),
gimp_deg_to_rad (mapvals.beta),
gimp_deg_to_rad (mapvals.gamma));
p[cnt+1] = mapvals.position;
gimp_vector3_set (&p[cnt+2], 0.0, 0.0, -0.35);
gimp_vector3_rotate (&p[cnt+2],
gimp_deg_to_rad (mapvals.alpha),
gimp_deg_to_rad (mapvals.beta),
gimp_deg_to_rad (mapvals.gamma));
p[cnt+3] = mapvals.position;
p[cnt + 4] = p[cnt];
gimp_vector3_mul (&p[cnt + 4], -1.0);
p[cnt + 5] = p[cnt + 1];
gimp_vector3_add (&p[cnt], &p[cnt], &mapvals.position);
gimp_vector3_add (&p[cnt + 2], &p[cnt + 2], &mapvals.position);
gimp_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)
{
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x1, &y1, &mapvals.viewpoint, &p[cnt]);
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x2, &y2, &mapvals.viewpoint, &p[cnt + 1]);
if (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++)
{
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x1, &y1, &mapvals.viewpoint, &p[cnt2]);
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x2, &y2, &mapvals.viewpoint, &p[cnt2 + 1]);
if (clip_line (&x1, &y1, &x2, &y2, cx1, cy1, cx2, cy2) == TRUE)
{
linetab[n].x1 = RINT (x1);
linetab[n].y1 = RINT (y1);
linetab[n].x2 = RINT (x2);
linetab[n].y2 = RINT (y2);
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;
}
static void
draw_wireframe_plane (gint startx,
gint starty,
gint pw,
gint ph)
{
GimpVector3 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 */
/* ======================== */
gimp_vector3_set (&v1, 0.5, 0.0, 0.0);
gimp_vector3_set (&v2, 0.0, 0.5, 0.0);
gimp_vector3_rotate (&v1,
gimp_deg_to_rad (mapvals.alpha),
gimp_deg_to_rad (mapvals.beta),
gimp_deg_to_rad (mapvals.gamma));
gimp_vector3_rotate (&v2,
gimp_deg_to_rad (mapvals.alpha),
gimp_deg_to_rad (mapvals.beta),
gimp_deg_to_rad (mapvals.gamma));
dir1 = v1; gimp_vector3_normalize (&dir1);
dir2 = v2; gimp_vector3_normalize (&dir2);
fac = 1.0 / (gdouble) WIRESIZE;
gimp_vector3_mul (&dir1, fac);
gimp_vector3_mul (&dir2, fac);
gimp_vector3_add (&a, &mapvals.position, &v1);
gimp_vector3_sub (&b, &a, &v2);
gimp_vector3_add (&a, &a, &v2);
gimp_vector3_sub (&d, &mapvals.position, &v1);
gimp_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++)
{
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x1, &y1, &mapvals.viewpoint, &a);
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x2, &y2, &mapvals.viewpoint, &b);
if (clip_line (&x1, &y1, &x2, &y2, cx1, cy1, cx2, cy2) == TRUE)
{
linetab[n].x1 = RINT (x1);
linetab[n].y1 = RINT (y1);
linetab[n].x2 = RINT (x2);
linetab[n].y2 = RINT (y2);
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++;
}
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x1, &y1, &mapvals.viewpoint, &c);
gimp_vector_3d_to_2d (startx, starty, pw, ph,
&x2, &y2, &mapvals.viewpoint, &d);
if (clip_line (&x1, &y1, &x2, &y2, cx1, cy1, cx2, cy2) == TRUE)
{
linetab[n].x1 = RINT (x1);
linetab[n].y1 = RINT (y1);
linetab[n].x2 = RINT (x2);
linetab[n].y2 = RINT (y2);
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++;
}
gimp_vector3_sub (&a, &a, &dir1);
gimp_vector3_sub (&b, &b, &dir1);
gimp_vector3_add (&c, &c, &dir2);
gimp_vector3_add (&d, &d, &dir2);
}
/* Mark end of lines */
/* ================= */
linetab[n].x1 = -1;
}
