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-rw-r--r--plug-ins/map-object/map-object-preview.c745
1 files changed, 745 insertions, 0 deletions
diff --git a/plug-ins/map-object/map-object-preview.c b/plug-ins/map-object/map-object-preview.c
new file mode 100644
index 0000000..afc29b4
--- /dev/null
+++ b/plug-ins/map-object/map-object-preview.c
@@ -0,0 +1,745 @@
+/*************************************************/
+/* Compute a preview image and preview wireframe */
+/*************************************************/
+
+#include "config.h"
+
+#include <gtk/gtk.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "map-object-main.h"
+#include "map-object-ui.h"
+#include "map-object-image.h"
+#include "map-object-apply.h"
+#include "map-object-shade.h"
+#include "map-object-preview.h"
+
+
+gdouble mat[3][4];
+gint lightx, lighty;
+
+/* Protos */
+/* ====== */
+
+static void compute_preview (gint x,
+ gint y,
+ gint w,
+ gint h,
+ gint pw,
+ gint ph);
+static void draw_light_marker (cairo_t *cr,
+ gint xpos,
+ gint ypos);
+static void draw_line (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph,
+ gdouble cx1,
+ gdouble cy1,
+ gdouble cx2,
+ gdouble cy2,
+ GimpVector3 a,
+ GimpVector3 b);
+static void draw_wireframe (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph);
+static void draw_preview_wireframe (cairo_t *cr);
+static void draw_wireframe_plane (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph);
+static void draw_wireframe_sphere (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph);
+static void draw_wireframe_box (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph);
+static void draw_wireframe_cylinder (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph);
+
+/**************************************************************/
+/* Computes a preview of the rectangle starting at (x,y) with */
+/* dimensions (w,h), placing the result in preview_RGB_data. */
+/**************************************************************/
+
+static void
+compute_preview (gint x,
+ gint y,
+ gint w,
+ gint h,
+ gint pw,
+ gint ph)
+{
+ gdouble xpostab[PREVIEW_WIDTH];
+ gdouble ypostab[PREVIEW_HEIGHT];
+ gdouble realw;
+ gdouble realh;
+ GimpVector3 p1, p2;
+ GimpRGB color;
+ GimpRGB lightcheck, darkcheck;
+ gint xcnt, ycnt, f1, f2;
+ guchar r, g, b;
+ glong index = 0;
+
+ init_compute ();
+
+ if (! preview_surface)
+ return;
+
+ 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 * ((gdouble) xcnt / (gdouble) pw);
+
+ for (ycnt = 0; ycnt < ph; ycnt++)
+ ypostab[ycnt] = p1.y + realh * ((gdouble) ycnt / (gdouble) ph);
+
+ /* Compute preview using the offset tables */
+ /* ======================================= */
+
+ if (mapvals.transparent_background == TRUE)
+ {
+ gimp_rgba_set (&background, 0.0, 0.0, 0.0, 0.0);
+ }
+ else
+ {
+ gimp_context_get_background (&background);
+ gimp_rgb_set_alpha (&background, 1.0);
+ }
+
+ gimp_rgba_set (&lightcheck,
+ GIMP_CHECK_LIGHT, GIMP_CHECK_LIGHT, GIMP_CHECK_LIGHT, 1.0);
+ gimp_rgba_set (&darkcheck,
+ GIMP_CHECK_DARK, GIMP_CHECK_DARK, GIMP_CHECK_DARK, 1.0);
+ gimp_vector3_set (&p2, -1.0, -1.0, 0.0);
+
+ cairo_surface_flush (preview_surface);
+
+ for (ycnt = 0; ycnt < ph; ycnt++)
+ {
+ index = ycnt * preview_rgb_stride;
+ 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
+ gimp_rgb_composite (&color, &lightcheck,
+ GIMP_RGB_COMPOSITE_BEHIND);
+ }
+ else
+ {
+ if (color.a == 0.0)
+ color = darkcheck;
+ else
+ gimp_rgb_composite (&color, &darkcheck,
+ GIMP_RGB_COMPOSITE_BEHIND);
+ }
+ }
+
+ gimp_rgb_get_uchar (&color, &r, &g, &b);
+ GIMP_CAIRO_RGB24_SET_PIXEL((preview_rgb_data + index), r, g, b);
+ index += 4;
+ }
+ }
+ cairo_surface_mark_dirty (preview_surface);
+}
+
+/*************************************************/
+/* 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 */
+/****************************************/
+
+static void
+draw_light_marker (cairo_t *cr,
+ gint xpos,
+ gint ypos)
+{
+ GdkColor color;
+
+ if (mapvals.lightsource.type != POINT_LIGHT)
+ return;
+
+ cairo_set_line_width (cr, 1.0);
+
+ color.red = 0x0;
+ color.green = 0x4000;
+ color.blue = 0xFFFF;
+ gdk_cairo_set_source_color (cr, &color);
+
+ lightx = xpos;
+ lighty = ypos;
+
+ cairo_arc (cr, lightx, lighty, 7, 0, 2 * G_PI);
+ cairo_fill (cr);
+}
+
+static void
+draw_lights (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph)
+{
+ gdouble dxpos, dypos;
+ gint xpos, ypos;
+
+ 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 (cr, 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.zoom;
+ ph = PREVIEW_HEIGHT * mapvals.zoom;
+ startx = (PREVIEW_WIDTH - pw) / 2;
+ starty = (PREVIEW_HEIGHT - ph) / 2;
+
+ gimp_vector_2d_to_3d (startx, starty, pw, ph, xpos, ypos,
+ &mapvals.viewpoint, &mapvals.lightsource.position);
+
+ gtk_widget_queue_draw (previewarea);
+}
+
+/**************************/
+/* Compute preview image. */
+/**************************/
+
+void
+compute_preview_image (void)
+{
+ GdkDisplay *display = gtk_widget_get_display (previewarea);
+ GdkCursor *cursor;
+ gint pw, ph;
+
+ pw = PREVIEW_WIDTH * mapvals.zoom;
+ ph = PREVIEW_HEIGHT * mapvals.zoom;
+
+ cursor = gdk_cursor_new_for_display (display, GDK_WATCH);
+ gdk_window_set_cursor (gtk_widget_get_window (previewarea), cursor);
+ gdk_cursor_unref (cursor);
+
+ compute_preview (0, 0, width - 1, height - 1, pw, ph);
+
+ cursor = gdk_cursor_new_for_display (display, GDK_HAND2);
+ gdk_window_set_cursor(gtk_widget_get_window (previewarea), cursor);
+ gdk_cursor_unref (cursor);
+}
+
+gboolean
+preview_expose (GtkWidget *widget,
+ GdkEventExpose *eevent)
+{
+ gint startx, starty, pw, ph;
+ cairo_t *cr;
+
+ cr = gdk_cairo_create (eevent->window);
+
+ pw = PREVIEW_WIDTH * mapvals.zoom;
+ ph = PREVIEW_HEIGHT * mapvals.zoom;
+ startx = (PREVIEW_WIDTH - pw) / 2;
+ starty = (PREVIEW_HEIGHT - ph) / 2;
+
+ cairo_set_source_surface (cr, preview_surface, startx, starty);
+ cairo_rectangle (cr, startx, starty, pw, ph);
+ cairo_clip (cr);
+
+ cairo_paint (cr);
+
+ cairo_reset_clip (cr);
+
+ if (mapvals.showgrid)
+ draw_preview_wireframe (cr);
+
+ cairo_reset_clip (cr);
+ draw_lights (cr, startx, starty, pw, ph);
+
+ cairo_destroy (cr);
+
+ return FALSE;
+}
+
+/**************************/
+/* Draw preview wireframe */
+/**************************/
+
+void
+draw_preview_wireframe (cairo_t *cr)
+{
+ gint startx, starty, pw, ph;
+
+ pw = PREVIEW_WIDTH * mapvals.zoom;
+ ph = PREVIEW_HEIGHT * mapvals.zoom;
+ startx = (PREVIEW_WIDTH - pw) / 2;
+ starty = (PREVIEW_HEIGHT - ph) / 2;
+
+ draw_wireframe (cr, startx, starty, pw, ph);
+}
+
+/****************************/
+/* Draw a wireframe preview */
+/****************************/
+
+void
+draw_wireframe (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph)
+{
+ cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
+ switch (mapvals.maptype)
+ {
+ case MAP_PLANE:
+ draw_wireframe_plane (cr, startx, starty, pw, ph);
+ break;
+ case MAP_SPHERE:
+ draw_wireframe_sphere (cr, startx, starty, pw, ph);
+ break;
+ case MAP_BOX:
+ draw_wireframe_box (cr, startx, starty, pw, ph);
+ break;
+ case MAP_CYLINDER:
+ draw_wireframe_cylinder (cr, startx, starty, pw, ph);
+ break;
+ }
+}
+
+static void
+draw_wireframe_plane (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph)
+{
+ GimpVector3 v1, v2, a, b, c, d, dir1, dir2;
+ gint cnt;
+ gdouble x1, y1, x2, y2, fac;
+
+ cairo_rectangle (cr, startx, starty, pw, ph);
+ cairo_clip (cr);
+
+ /* 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;
+
+ 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);
+
+ cairo_move_to (cr, RINT (x1) + 0.5, RINT (y1) + 0.5);
+ cairo_line_to (cr, RINT (x2) + 0.5, RINT (y2) + 0.5);
+
+ 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);
+
+ cairo_move_to (cr, RINT (x1) + 0.5, RINT (y1) + 0.5);
+ cairo_line_to (cr, RINT (x2) + 0.5, RINT (y2) + 0.5);
+
+ gimp_vector3_sub (&a, &a, &dir1);
+ gimp_vector3_sub (&b, &b, &dir1);
+ gimp_vector3_add (&c, &c, &dir2);
+ gimp_vector3_add (&d, &d, &dir2);
+ }
+
+ cairo_set_line_width (cr, 3.0);
+ cairo_stroke_preserve (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+ cairo_stroke (cr);
+}
+
+static void
+draw_wireframe_sphere (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph)
+{
+ GimpVector3 p[2 * (WIRESIZE + 5)];
+ gint cnt, cnt2;
+ gdouble x1, y1, x2, y2, twopifac;
+
+ cairo_rectangle (cr, startx, starty, pw, ph);
+ cairo_clip (cr);
+
+ /* 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) */
+ /* ============================================ */
+
+ 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]);
+
+ cairo_move_to (cr, (gint) (x1 + 0.5) + 0.5, (gint) (y1 + 0.5) + 0.5);
+ cairo_line_to (cr, (gint) (x2 + 0.5) + 0.5, (gint) (y2 + 0.5) + 0.5);
+ }
+ }
+
+ /* 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]);
+
+ cairo_move_to (cr, RINT (x1) + 0.5, RINT (y1) + 0.5);
+ cairo_line_to (cr, RINT (x2) + 0.5, RINT (y2) + 0.5);
+
+ cnt2 += 2;
+ }
+
+ cairo_set_line_width (cr, 3.0);
+ cairo_stroke_preserve (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+ cairo_stroke (cr);
+}
+
+static void
+draw_line (cairo_t *cr,
+ 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;
+
+ 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);
+
+ cairo_move_to (cr, RINT (x1) + 0.5, RINT (y1) + 0.5);
+ cairo_line_to (cr, RINT (x2) + 0.5, RINT (y2) + 0.5);
+}
+
+static void
+draw_wireframe_box (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph)
+{
+ GimpVector3 p[8], tmp, scale;
+ gint i;
+ gdouble cx1, cy1, cx2, cy2;
+
+ cairo_rectangle (cr, startx, starty, pw, ph);
+ cairo_clip (cr);
+
+ /* Compute wireframe points */
+ /* ======================== */
+
+ init_compute ();
+
+ scale = mapvals.scale;
+ gimp_vector3_mul (&scale, 0.5);
+
+ gimp_vector3_set (&p[0], -scale.x, -scale.y, scale.z);
+ gimp_vector3_set (&p[1], scale.x, -scale.y, scale.z);
+ gimp_vector3_set (&p[2], scale.x, scale.y, scale.z);
+ gimp_vector3_set (&p[3], -scale.x, scale.y, scale.z);
+
+ gimp_vector3_set (&p[4], -scale.x, -scale.y, -scale.z);
+ gimp_vector3_set (&p[5], scale.x, -scale.y, -scale.z);
+ gimp_vector3_set (&p[6], scale.x, scale.y, -scale.z);
+ gimp_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);
+ gimp_vector3_add (&p[i], &tmp, &mapvals.position);
+ }
+
+ /* Draw the box */
+ /* ============ */
+
+ cx1 = (gdouble) startx;
+ cy1 = (gdouble) starty;
+ cx2 = cx1 + (gdouble) pw;
+ cy2 = cy1 + (gdouble) ph;
+
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[0],p[1]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[1],p[2]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[2],p[3]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[3],p[0]);
+
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[4],p[5]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[5],p[6]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[6],p[7]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[7],p[4]);
+
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[0],p[4]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[1],p[5]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[2],p[6]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[3],p[7]);
+
+ cairo_set_line_width (cr, 3.0);
+ cairo_stroke_preserve (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+ cairo_stroke (cr);
+}
+
+static void
+draw_wireframe_cylinder (cairo_t *cr,
+ gint startx,
+ gint starty,
+ gint pw,
+ gint ph)
+{
+ GimpVector3 p[2*8], a, axis, scale;
+ gint i;
+ gdouble cx1, cy1, cx2, cy2;
+ gfloat m[16], l, angle;
+
+ cairo_rectangle (cr, startx, starty, pw, ph);
+ cairo_clip (cr);
+
+ /* Compute wireframe points */
+ /* ======================== */
+
+ init_compute ();
+
+ scale = mapvals.scale;
+ gimp_vector3_mul (&scale, 0.5);
+
+ l = mapvals.cylinder_length / 2.0;
+ angle = 0;
+
+ gimp_vector3_set (&axis, 0.0, 1.0, 0.0);
+
+ for (i = 0; i < 8; i++)
+ {
+ rotatemat (angle, &axis, m);
+
+ gimp_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);
+ gimp_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++)
+ {
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[i],p[i+1]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[i+8],p[i+9]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[i],p[i+8]);
+ }
+
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[7],p[0]);
+ draw_line (cr, startx,starty,pw,ph, cx1,cy1,cx2,cy2, p[15],p[8]);
+
+ cairo_set_line_width (cr, 3.0);
+ cairo_stroke_preserve (cr);
+ cairo_set_line_width (cr, 1.0);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+ cairo_stroke (cr);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 00:56:18 +0000