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; }