/* * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation * All rights reserved. * * This file is part of the Gnome Library. * * The Gnome Library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * The Gnome Library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with the Gnome Library; see the file COPYING.LIB. If not, * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* @NOTATION@ */ /* Line/curve item type for GnomeCanvas widget * * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties. * * * Author: Federico Mena */ #include #include #include #include #include #include #include #include "libgnomecanvas.h" #define noVERBOSE #define DEFAULT_SPLINE_STEPS 12 /* this is what Tk uses */ #define NUM_ARROW_POINTS 6 /* number of points in an arrowhead */ #define NUM_STATIC_POINTS 256 /* number of static points to use to avoid allocating arrays */ #define GROW_BOUNDS(bx1, by1, bx2, by2, x, y) { \ if (x < bx1) \ bx1 = x; \ \ if (x > bx2) \ bx2 = x; \ \ if (y < by1) \ by1 = y; \ \ if (y > by2) \ by2 = y; \ } enum { PROP_0, PROP_POINTS, PROP_FILL_COLOR, PROP_FILL_COLOR_GDK, PROP_FILL_COLOR_RGBA, PROP_FILL_STIPPLE, PROP_WIDTH_PIXELS, PROP_WIDTH_UNITS, PROP_CAP_STYLE, PROP_JOIN_STYLE, PROP_LINE_STYLE, PROP_FIRST_ARROWHEAD, PROP_LAST_ARROWHEAD, PROP_SMOOTH, PROP_SPLINE_STEPS, PROP_ARROW_SHAPE_A, PROP_ARROW_SHAPE_B, PROP_ARROW_SHAPE_C }; static void gnome_canvas_line_class_init (GnomeCanvasLineClass *class); static void gnome_canvas_line_init (GnomeCanvasLine *line); static void gnome_canvas_line_destroy (GnomeCanvasItem *object); static void gnome_canvas_line_set_property (GObject *object, guint param_id, const GValue *value, GParamSpec *pspec); static void gnome_canvas_line_get_property (GObject *object, guint param_id, GValue *value, GParamSpec *pspec); static void gnome_canvas_line_update (GnomeCanvasItem *item, gdouble *affine, ArtSVP *clip_path, gint flags); static void gnome_canvas_line_realize (GnomeCanvasItem *item); static void gnome_canvas_line_unrealize (GnomeCanvasItem *item); static void gnome_canvas_line_draw (GnomeCanvasItem *item, GdkDrawable *drawable, gint x, gint y, gint width, gint height); static gdouble gnome_canvas_line_point (GnomeCanvasItem *item, gdouble x, gdouble y, gint cx, gint cy, GnomeCanvasItem **actual_item); static void gnome_canvas_line_bounds (GnomeCanvasItem *item, gdouble *x1, gdouble *y1, gdouble *x2, gdouble *y2); static void gnome_canvas_line_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf); static GnomeCanvasItemClass *parent_class; GType gnome_canvas_line_get_type (void) { static GType line_type; if (!line_type) { const GTypeInfo object_info = { sizeof (GnomeCanvasLineClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) gnome_canvas_line_class_init, (GClassFinalizeFunc) NULL, NULL, /* class_data */ sizeof (GnomeCanvasLine), 0, /* n_preallocs */ (GInstanceInitFunc) gnome_canvas_line_init, NULL /* value_table */ }; line_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasLine", &object_info, 0); } return line_type; } static void gnome_canvas_line_class_init (GnomeCanvasLineClass *class) { GObjectClass *gobject_class; GnomeCanvasItemClass *item_class; gobject_class = (GObjectClass *) class; item_class = (GnomeCanvasItemClass *) class; parent_class = g_type_class_peek_parent (class); gobject_class->set_property = gnome_canvas_line_set_property; gobject_class->get_property = gnome_canvas_line_get_property; g_object_class_install_property (gobject_class, PROP_POINTS, g_param_spec_boxed ("points", NULL, NULL, GNOME_TYPE_CANVAS_POINTS, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_FILL_COLOR, g_param_spec_string ("fill_color", NULL, NULL, NULL, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_FILL_COLOR_GDK, g_param_spec_boxed ("fill_color_gdk", NULL, NULL, GDK_TYPE_COLOR, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_FILL_COLOR_RGBA, g_param_spec_uint ("fill_color_rgba", NULL, NULL, 0, G_MAXUINT, 0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_FILL_STIPPLE, g_param_spec_object ("fill_stipple", NULL, NULL, GDK_TYPE_DRAWABLE, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_WIDTH_PIXELS, g_param_spec_uint ("width_pixels", NULL, NULL, 0, G_MAXUINT, 0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_WIDTH_UNITS, g_param_spec_double ("width_units", NULL, NULL, 0.0, G_MAXDOUBLE, 0.0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_CAP_STYLE, g_param_spec_enum ("cap_style", NULL, NULL, GDK_TYPE_CAP_STYLE, GDK_CAP_BUTT, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_JOIN_STYLE, g_param_spec_enum ("join_style", NULL, NULL, GDK_TYPE_JOIN_STYLE, GDK_JOIN_MITER, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_LINE_STYLE, g_param_spec_enum ("line_style", NULL, NULL, GDK_TYPE_LINE_STYLE, GDK_LINE_SOLID, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_FIRST_ARROWHEAD, g_param_spec_boolean ("first_arrowhead", NULL, NULL, FALSE, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_LAST_ARROWHEAD, g_param_spec_boolean ("last_arrowhead", NULL, NULL, FALSE, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_SMOOTH, g_param_spec_boolean ("smooth", NULL, NULL, FALSE, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_SPLINE_STEPS, g_param_spec_uint ("spline_steps", NULL, NULL, 0, G_MAXUINT, DEFAULT_SPLINE_STEPS, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_ARROW_SHAPE_A, g_param_spec_double ("arrow_shape_a", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE, 0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_ARROW_SHAPE_B, g_param_spec_double ("arrow_shape_b", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE, 0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); g_object_class_install_property (gobject_class, PROP_ARROW_SHAPE_C, g_param_spec_double ("arrow_shape_c", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE, 0, (G_PARAM_READABLE | G_PARAM_WRITABLE))); item_class->destroy = gnome_canvas_line_destroy; item_class->update = gnome_canvas_line_update; item_class->realize = gnome_canvas_line_realize; item_class->unrealize = gnome_canvas_line_unrealize; item_class->draw = gnome_canvas_line_draw; item_class->point = gnome_canvas_line_point; item_class->bounds = gnome_canvas_line_bounds; item_class->render = gnome_canvas_line_render; } static void gnome_canvas_line_init (GnomeCanvasLine *line) { line->width = 0.0; line->cap = GDK_CAP_BUTT; line->join = GDK_JOIN_MITER; line->line_style = GDK_LINE_SOLID; line->shape_a = 0.0; line->shape_b = 0.0; line->shape_c = 0.0; line->spline_steps = DEFAULT_SPLINE_STEPS; } static void gnome_canvas_line_destroy (GnomeCanvasItem *object) { GnomeCanvasLine *line; g_return_if_fail (object != NULL); g_return_if_fail (GNOME_IS_CANVAS_LINE (object)); line = GNOME_CANVAS_LINE (object); /* remember, destroy can be run multiple times! */ if (line->coords) g_free (line->coords); line->coords = NULL; if (line->first_coords) g_free (line->first_coords); line->first_coords = NULL; if (line->last_coords) g_free (line->last_coords); line->last_coords = NULL; if (line->stipple) g_object_unref (line->stipple); line->stipple = NULL; if (line->fill_svp) art_svp_free (line->fill_svp); line->fill_svp = NULL; if (line->first_svp) art_svp_free (line->first_svp); line->first_svp = NULL; if (line->last_svp) art_svp_free (line->last_svp); line->last_svp = NULL; if (GNOME_CANVAS_ITEM_CLASS (parent_class)->destroy) GNOME_CANVAS_ITEM_CLASS (parent_class)->destroy (object); } /* Computes the bounding box of the line, including its arrow points. Assumes that the number of * points in the line is not zero. */ static void get_bounds (GnomeCanvasLine *line, gdouble *bx1, gdouble *by1, gdouble *bx2, gdouble *by2) { gdouble *coords; gdouble x1, y1, x2, y2; gdouble width; gint i; if (!line->coords) { *bx1 = *by1 = *bx2 = *by2 = 0.0; return; } /* Find bounding box of line's points */ x1 = x2 = line->coords[0]; y1 = y2 = line->coords[1]; for (i = 1, coords = line->coords + 2; i < line->num_points; i++, coords += 2) GROW_BOUNDS (x1, y1, x2, y2, coords[0], coords[1]); /* Add possible over-estimate for wide lines */ if (line->width_pixels) width = line->width / line->item.canvas->pixels_per_unit; else width = line->width; x1 -= width; y1 -= width; x2 += width; y2 += width; /* For mitered lines, make a second pass through all the points. Compute the location of * the two miter vertex points and add them to the bounding box. */ if (line->join == GDK_JOIN_MITER) for (i = line->num_points, coords = line->coords; i >= 3; i--, coords += 2) { gdouble mx1, my1, mx2, my2; if (gnome_canvas_get_miter_points (coords[0], coords[1], coords[2], coords[3], coords[4], coords[5], width, &mx1, &my1, &mx2, &my2)) { GROW_BOUNDS (x1, y1, x2, y2, mx1, my1); GROW_BOUNDS (x1, y1, x2, y2, mx2, my2); } } /* Add the arrow points, if any */ if (line->first_arrow && line->first_coords) for (i = 0, coords = line->first_coords; i < NUM_ARROW_POINTS; i++, coords += 2) GROW_BOUNDS (x1, y1, x2, y2, coords[0], coords[1]); if (line->last_arrow && line->last_coords) for (i = 0, coords = line->last_coords; i < NUM_ARROW_POINTS; i++, coords += 2) GROW_BOUNDS (x1, y1, x2, y2, coords[0], coords[1]); /* Done */ *bx1 = x1; *by1 = y1; *bx2 = x2; *by2 = y2; } /* Computes the bounding box of the line, in canvas coordinates. Assumes that the number of points in the polygon is * not zero. Affine is the i2c transformation. */ static void get_bounds_canvas (GnomeCanvasLine *line, gdouble *bx1, gdouble *by1, gdouble *bx2, gdouble *by2, gdouble affine[6]) { /* It would be possible to tighten the bounds somewhat by transforming the individual points before aggregating them into the bbox. But it hardly seems worth it. */ ArtDRect bbox_world; ArtDRect bbox_canvas; get_bounds (line, &bbox_world.x0, &bbox_world.y0, &bbox_world.x1, &bbox_world.y1); art_drect_affine_transform (&bbox_canvas, &bbox_world, affine); /* include 1 pixel of fudge */ *bx1 = bbox_canvas.x0 - 1; *by1 = bbox_canvas.y0 - 1; *bx2 = bbox_canvas.x1 + 1; *by2 = bbox_canvas.y1 + 1; } /* Recalculates the arrow polygons for the line */ static void reconfigure_arrows (GnomeCanvasLine *line) { gdouble *poly, *coords; gdouble dx, dy, length; gdouble sin_theta, cos_theta, tmp; gdouble frac_height; /* Line width as fraction of arrowhead width */ gdouble backup; /* Distance to backup end points so the line ends in the middle of the arrowhead */ gdouble vx, vy; /* Position of arrowhead vertex */ gdouble shape_a, shape_b, shape_c; gdouble width; gint i; if (line->num_points == 0) return; /* Set up things */ if (line->first_arrow) { if (line->first_coords) { line->coords[0] = line->first_coords[0]; line->coords[1] = line->first_coords[1]; } else line->first_coords = g_new (double, 2 * NUM_ARROW_POINTS); } else if (line->first_coords) { line->coords[0] = line->first_coords[0]; line->coords[1] = line->first_coords[1]; g_free (line->first_coords); line->first_coords = NULL; } i = 2 * (line->num_points - 1); if (line->last_arrow) { if (line->last_coords) { line->coords[i] = line->last_coords[0]; line->coords[i + 1] = line->last_coords[1]; } else line->last_coords = g_new (double, 2 * NUM_ARROW_POINTS); } else if (line->last_coords) { line->coords[i] = line->last_coords[0]; line->coords[i + 1] = line->last_coords[1]; g_free (line->last_coords); line->last_coords = NULL; } if (!line->first_arrow && !line->last_arrow) return; if (line->width_pixels) width = line->width / line->item.canvas->pixels_per_unit; else width = line->width; /* Add fudge value for better-looking results */ shape_a = line->shape_a; shape_b = line->shape_b; shape_c = line->shape_c + width / 2.0; if (line->width_pixels) { shape_a /= line->item.canvas->pixels_per_unit; shape_b /= line->item.canvas->pixels_per_unit; shape_c /= line->item.canvas->pixels_per_unit; } shape_a += 0.001; shape_b += 0.001; shape_c += 0.001; /* Compute the polygon for the first arrowhead and adjust the first point in the line so * that the line does not stick out past the leading edge of the arrowhead. */ frac_height = (line->width / 2.0) / shape_c; backup = frac_height * shape_b + shape_a * (1.0 - frac_height) / 2.0; if (line->first_arrow) { poly = line->first_coords; poly[0] = poly[10] = line->coords[0]; poly[1] = poly[11] = line->coords[1]; dx = poly[0] - line->coords[2]; dy = poly[1] - line->coords[3]; length = sqrt (dx * dx + dy * dy); if (length < GNOME_CANVAS_EPSILON) sin_theta = cos_theta = 0.0; else { sin_theta = dy / length; cos_theta = dx / length; } vx = poly[0] - shape_a * cos_theta; vy = poly[1] - shape_a * sin_theta; tmp = shape_c * sin_theta; poly[2] = poly[0] - shape_b * cos_theta + tmp; poly[8] = poly[2] - 2.0 * tmp; tmp = shape_c * cos_theta; poly[3] = poly[1] - shape_b * sin_theta - tmp; poly[9] = poly[3] + 2.0 * tmp; poly[4] = poly[2] * frac_height + vx * (1.0 - frac_height); poly[5] = poly[3] * frac_height + vy * (1.0 - frac_height); poly[6] = poly[8] * frac_height + vx * (1.0 - frac_height); poly[7] = poly[9] * frac_height + vy * (1.0 - frac_height); /* Move the first point towards the second so that the corners at the end of the * line are inside the arrowhead. */ line->coords[0] = poly[0] - backup * cos_theta; line->coords[1] = poly[1] - backup * sin_theta; } /* Same process for last arrowhead */ if (line->last_arrow) { coords = line->coords + 2 * (line->num_points - 2); poly = line->last_coords; poly[0] = poly[10] = coords[2]; poly[1] = poly[11] = coords[3]; dx = poly[0] - coords[0]; dy = poly[1] - coords[1]; length = sqrt (dx * dx + dy * dy); if (length < GNOME_CANVAS_EPSILON) sin_theta = cos_theta = 0.0; else { sin_theta = dy / length; cos_theta = dx / length; } vx = poly[0] - shape_a * cos_theta; vy = poly[1] - shape_a * sin_theta; tmp = shape_c * sin_theta; poly[2] = poly[0] - shape_b * cos_theta + tmp; poly[8] = poly[2] - 2.0 * tmp; tmp = shape_c * cos_theta; poly[3] = poly[1] - shape_b * sin_theta - tmp; poly[9] = poly[3] + 2.0 * tmp; poly[4] = poly[2] * frac_height + vx * (1.0 - frac_height); poly[5] = poly[3] * frac_height + vy * (1.0 - frac_height); poly[6] = poly[8] * frac_height + vx * (1.0 - frac_height); poly[7] = poly[9] * frac_height + vy * (1.0 - frac_height); coords[2] = poly[0] - backup * cos_theta; coords[3] = poly[1] - backup * sin_theta; } } /* Convenience function to set the line's GC's foreground color */ static void set_line_gc_foreground (GnomeCanvasLine *line) { GdkColor c; if (!line->gc) return; c.pixel = line->fill_pixel; gdk_gc_set_foreground (line->gc, &c); } /* Recalculate the line's width and set it in its GC */ static void set_line_gc_width (GnomeCanvasLine *line) { gint width; if (!line->gc) return; if (line->width_pixels) width = (gint) line->width; else width = (gint) (line->width * line->item.canvas->pixels_per_unit + 0.5); gdk_gc_set_line_attributes (line->gc, width, line->line_style, (line->first_arrow || line->last_arrow) ? GDK_CAP_BUTT : line->cap, line->join); } /* Sets the stipple pattern for the line */ static void set_stipple (GnomeCanvasLine *line, GdkBitmap *stipple, gint reconfigure) { if (line->stipple && !reconfigure) g_object_unref (line->stipple); line->stipple = stipple; if (stipple && !reconfigure) g_object_ref (stipple); if (line->gc) { if (stipple) { gdk_gc_set_stipple (line->gc, stipple); gdk_gc_set_fill (line->gc, GDK_STIPPLED); } else gdk_gc_set_fill (line->gc, GDK_SOLID); } } static void gnome_canvas_line_set_property (GObject *object, guint param_id, const GValue *value, GParamSpec *pspec) { GnomeCanvasItem *item; GnomeCanvasLine *line; GnomeCanvasPoints *points; GdkColor color = { 0, 0, 0, 0, }; GdkColor *pcolor; gboolean color_changed; gint have_pixel; g_return_if_fail (object != NULL); g_return_if_fail (GNOME_IS_CANVAS_LINE (object)); item = GNOME_CANVAS_ITEM (object); line = GNOME_CANVAS_LINE (object); color_changed = FALSE; have_pixel = FALSE; switch (param_id) { case PROP_POINTS: points = g_value_get_boxed (value); if (line->coords) { g_free (line->coords); line->coords = NULL; } if (!points) line->num_points = 0; else { line->num_points = points->num_points; line->coords = g_new (double, 2 * line->num_points); memcpy (line->coords, points->coords, 2 * line->num_points * sizeof (gdouble)); } /* Drop the arrowhead polygons if they exist -- they will be regenerated */ if (line->first_coords) { g_free (line->first_coords); line->first_coords = NULL; } if (line->last_coords) { g_free (line->last_coords); line->last_coords = NULL; } /* Since the line's points have changed, we need to re-generate arrowheads in * addition to recalculating the bounds. */ gnome_canvas_item_request_update (item); break; case PROP_FILL_COLOR: if (g_value_get_string (value)) gdk_color_parse (g_value_get_string (value), &color); line->fill_rgba = ((color.red & 0xff00) << 16 | (color.green & 0xff00) << 8 | (color.blue & 0xff00) | 0xff); color_changed = TRUE; break; case PROP_FILL_COLOR_GDK: pcolor = g_value_get_boxed (value); if (pcolor) { GdkColormap *colormap; color = *pcolor; colormap = gtk_widget_get_colormap (GTK_WIDGET (item->canvas)); gdk_rgb_find_color (colormap, &color); have_pixel = TRUE; } line->fill_rgba = ((color.red & 0xff00) << 16 | (color.green & 0xff00) << 8 | (color.blue & 0xff00) | 0xff); color_changed = TRUE; break; case PROP_FILL_COLOR_RGBA: line->fill_rgba = g_value_get_uint (value); color_changed = TRUE; break; case PROP_FILL_STIPPLE: set_stipple (line, (GdkBitmap *) g_value_get_object (value), FALSE); gnome_canvas_item_request_redraw_svp (item, line->fill_svp); break; case PROP_WIDTH_PIXELS: line->width = g_value_get_uint (value); line->width_pixels = TRUE; set_line_gc_width (line); gnome_canvas_item_request_update (item); break; case PROP_WIDTH_UNITS: line->width = fabs (g_value_get_double (value)); line->width_pixels = FALSE; set_line_gc_width (line); gnome_canvas_item_request_update (item); break; case PROP_CAP_STYLE: line->cap = g_value_get_enum (value); gnome_canvas_item_request_update (item); break; case PROP_JOIN_STYLE: line->join = g_value_get_enum (value); gnome_canvas_item_request_update (item); break; case PROP_LINE_STYLE: line->line_style = g_value_get_enum (value); set_line_gc_width (line); gnome_canvas_item_request_update (item); break; case PROP_FIRST_ARROWHEAD: line->first_arrow = g_value_get_boolean (value); gnome_canvas_item_request_update (item); break; case PROP_LAST_ARROWHEAD: line->last_arrow = g_value_get_boolean (value); gnome_canvas_item_request_update (item); break; case PROP_SMOOTH: /* FIXME */ break; case PROP_SPLINE_STEPS: /* FIXME */ break; case PROP_ARROW_SHAPE_A: line->shape_a = fabs (g_value_get_double (value)); gnome_canvas_item_request_update (item); break; case PROP_ARROW_SHAPE_B: line->shape_b = fabs (g_value_get_double (value)); gnome_canvas_item_request_update (item); break; case PROP_ARROW_SHAPE_C: line->shape_c = fabs (g_value_get_double (value)); gnome_canvas_item_request_update (item); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); break; } if (color_changed) { if (have_pixel) line->fill_pixel = color.pixel; else line->fill_pixel = gnome_canvas_get_color_pixel (item->canvas, line->fill_rgba); set_line_gc_foreground (line); gnome_canvas_item_request_redraw_svp (item, line->fill_svp); if (line->first_svp) gnome_canvas_item_request_redraw_svp (item, line->first_svp); if (line->last_svp) gnome_canvas_item_request_redraw_svp (item, line->last_svp); } } /* Returns a copy of the line's points without the endpoint adjustments for * arrowheads. */ static GnomeCanvasPoints * get_points (GnomeCanvasLine *line) { GnomeCanvasPoints *points; gint start_ofs, end_ofs; if (line->num_points == 0) return NULL; start_ofs = end_ofs = 0; points = gnome_canvas_points_new (line->num_points); /* Invariant: if first_coords or last_coords exist, then the line's * endpoints have been adjusted. */ if (line->first_coords) { start_ofs = 1; points->coords[0] = line->first_coords[0]; points->coords[1] = line->first_coords[1]; } if (line->last_coords) { end_ofs = 1; points->coords[2 * (line->num_points - 1)] = line->last_coords[0]; points->coords[2 * (line->num_points - 1) + 1] = line->last_coords[1]; } memcpy (points->coords + 2 * start_ofs, line->coords + 2 * start_ofs, 2 * (line->num_points - (start_ofs + end_ofs)) * sizeof (gdouble)); return points; } static void gnome_canvas_line_get_property (GObject *object, guint param_id, GValue *value, GParamSpec *pspec) { GnomeCanvasLine *line; g_return_if_fail (object != NULL); g_return_if_fail (GNOME_IS_CANVAS_LINE (object)); line = GNOME_CANVAS_LINE (object); switch (param_id) { case PROP_POINTS: /* get_points returns a copy */ g_value_take_boxed (value, get_points (line)); break; case PROP_FILL_COLOR: g_value_take_string (value, g_strdup_printf ("#%02x%02x%02x", line->fill_rgba >> 24, (line->fill_rgba >> 16) & 0xff, (line->fill_rgba >> 8) & 0xff)); break; case PROP_FILL_COLOR_GDK: { GnomeCanvas *canvas = GNOME_CANVAS_ITEM (line)->canvas; GdkColormap *colormap = gtk_widget_get_colormap (GTK_WIDGET (canvas)); GdkColor color; gdk_colormap_query_color (colormap, line->fill_pixel, &color); g_value_set_boxed (value, &color); break; } case PROP_FILL_COLOR_RGBA: g_value_set_uint (value, line->fill_rgba); break; case PROP_FILL_STIPPLE: g_value_set_object (value, line->stipple); break; case PROP_WIDTH_PIXELS: g_value_set_uint (value, line->width); break; case PROP_WIDTH_UNITS: g_value_set_double (value, line->width); break; case PROP_CAP_STYLE: g_value_set_enum (value, line->cap); break; case PROP_JOIN_STYLE: g_value_set_enum (value, line->join); break; case PROP_LINE_STYLE: g_value_set_enum (value, line->line_style); break; case PROP_FIRST_ARROWHEAD: g_value_set_boolean (value, line->first_arrow); break; case PROP_LAST_ARROWHEAD: g_value_set_boolean (value, line->last_arrow); break; case PROP_SMOOTH: g_value_set_boolean (value, line->smooth); break; case PROP_SPLINE_STEPS: g_value_set_uint (value, line->spline_steps); break; case PROP_ARROW_SHAPE_A: g_value_set_double (value, line->shape_a); break; case PROP_ARROW_SHAPE_B: g_value_set_double (value, line->shape_b); break; case PROP_ARROW_SHAPE_C: g_value_set_double (value, line->shape_c); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); break; } } static void gnome_canvas_line_render (GnomeCanvasItem *item, GnomeCanvasBuf *buf) { GnomeCanvasLine *line; line = GNOME_CANVAS_LINE (item); if (line->fill_svp != NULL) gnome_canvas_render_svp (buf, line->fill_svp, line->fill_rgba); if (line->first_svp != NULL) gnome_canvas_render_svp (buf, line->first_svp, line->fill_rgba); if (line->last_svp != NULL) gnome_canvas_render_svp (buf, line->last_svp, line->fill_rgba); } static ArtSVP * svp_from_points (const gdouble *item_coords, gint num_points, const gdouble affine[6]) { ArtVpath *vpath; ArtSVP *svp; gdouble x, y; gint i; vpath = art_new (ArtVpath, num_points + 2); for (i = 0; i < num_points; i++) { vpath[i].code = i == 0 ? ART_MOVETO : ART_LINETO; x = item_coords[i * 2]; y = item_coords[i * 2 + 1]; vpath[i].x = x * affine[0] + y * affine[2] + affine[4]; vpath[i].y = x * affine[1] + y * affine[3] + affine[5]; } #if 0 vpath[i].code = ART_LINETO; vpath[i].x = vpath[0].x; vpath[i].y = vpath[0].y; i++; #endif vpath[i].code = ART_END; vpath[i].x = 0; vpath[i].y = 0; svp = art_svp_from_vpath (vpath); art_free (vpath); return svp; } static void gnome_canvas_line_update (GnomeCanvasItem *item, gdouble *affine, ArtSVP *clip_path, gint flags) { GnomeCanvasLine *line; gdouble x1, y1, x2, y2; line = GNOME_CANVAS_LINE (item); if (parent_class->update) (* parent_class->update) (item, affine, clip_path, flags); reconfigure_arrows (line); set_line_gc_foreground (line); set_line_gc_width (line); set_stipple (line, line->stipple, TRUE); get_bounds_canvas (line, &x1, &y1, &x2, &y2, affine); gnome_canvas_update_bbox (item, x1, y1, x2, y2); } static void gnome_canvas_line_realize (GnomeCanvasItem *item) { GtkLayout *layout; GnomeCanvasLine *line; GdkWindow *bin_window; line = GNOME_CANVAS_LINE (item); if (parent_class->realize) (* parent_class->realize) (item); layout = GTK_LAYOUT (item->canvas); bin_window = gtk_layout_get_bin_window (layout); line->gc = gdk_gc_new (bin_window); #if 0 (* GNOME_CANVAS_ITEM_CLASS (item->object.klass)->update) (item, NULL, NULL, 0); #endif } static void gnome_canvas_line_unrealize (GnomeCanvasItem *item) { GnomeCanvasLine *line; line = GNOME_CANVAS_LINE (item); g_object_unref (line->gc); line->gc = NULL; if (parent_class->unrealize) (* parent_class->unrealize) (item); } static void item_to_canvas (GnomeCanvas *canvas, gdouble *item_coords, GdkPoint *canvas_coords, gint num_points, gint *num_drawn_points, gdouble i2c[6], gint x, gint y) { gint i; gint old_cx, old_cy; gint cx, cy; ArtPoint pi, pc; #ifdef VERBOSE { gchar str[128]; art_affine_to_string (str, i2c); g_print ("line item_to_canvas %s\n", str); } #endif /* the first point is always drawn */ pi.x = item_coords[0]; pi.y = item_coords[1]; art_affine_point (&pc, &pi, i2c); cx = floor (pc.x + 0.5); cy = floor (pc.y + 0.5); canvas_coords->x = cx - x; canvas_coords->y = cy - y; canvas_coords++; old_cx = cx; old_cy = cy; *num_drawn_points = 1; for (i = 1; i < num_points; i++) { pi.x = item_coords[i * 2]; pi.y = item_coords[i * 2 + 1]; art_affine_point (&pc, &pi, i2c); cx = floor (pc.x + 0.5); cy = floor (pc.y + 0.5); if (old_cx != cx || old_cy != cy) { canvas_coords->x = cx - x; canvas_coords->y = cy - y; old_cx = cx; old_cy = cy; canvas_coords++; (*num_drawn_points)++; } } } static void gnome_canvas_line_draw (GnomeCanvasItem *item, GdkDrawable *drawable, gint x, gint y, gint width, gint height) { GnomeCanvasLine *line; GdkPoint static_points[NUM_STATIC_POINTS]; GdkPoint *points; gint actual_num_points_drawn; gdouble i2c[6]; line = GNOME_CANVAS_LINE (item); if (line->num_points == 0) return; /* Build array of canvas pixel coordinates */ if (line->num_points <= NUM_STATIC_POINTS) points = static_points; else points = g_new (GdkPoint, line->num_points); gnome_canvas_item_i2c_affine (item, i2c); item_to_canvas (item->canvas, line->coords, points, line->num_points, &actual_num_points_drawn, i2c, x, y); if (line->stipple) gnome_canvas_set_stipple_origin (item->canvas, line->gc); gdk_draw_lines (drawable, line->gc, points, actual_num_points_drawn); if (points != static_points) g_free (points); /* Draw arrowheads */ points = static_points; if (line->first_arrow) { item_to_canvas (item->canvas, line->first_coords, points, NUM_ARROW_POINTS, &actual_num_points_drawn, i2c, x, y); gdk_draw_polygon (drawable, line->gc, TRUE, points, actual_num_points_drawn ); } if (line->last_arrow) { item_to_canvas (item->canvas, line->last_coords, points, NUM_ARROW_POINTS, &actual_num_points_drawn, i2c, x, y); gdk_draw_polygon (drawable, line->gc, TRUE, points, actual_num_points_drawn ); } } static double gnome_canvas_line_point (GnomeCanvasItem *item, gdouble x, gdouble y, gint cx, gint cy, GnomeCanvasItem **actual_item) { GnomeCanvasLine *line; gdouble *line_points = NULL, *coords; gdouble static_points[2 * NUM_STATIC_POINTS]; gdouble poly[10]; gdouble best, dist; gdouble dx, dy; gdouble width; gint num_points = 0, i; gint changed_miter_to_bevel; #ifdef VERBOSE g_print ("gnome_canvas_line_point x, y = (%g, %g); cx, cy = (%d, %d)\n", x, y, cx, cy); #endif line = GNOME_CANVAS_LINE (item); *actual_item = item; best = 1.0e36; /* Handle smoothed lines by generating an expanded set ot points */ if (line->smooth && (line->num_points > 2)) { /* FIXME */ } else { num_points = line->num_points; line_points = line->coords; } /* Compute a polygon for each edge of the line and test the point against it. The effective * width of the line is adjusted so that it will be at least one pixel thick (so that zero * pixel-wide lines can be pickedup as well). */ if (line->width_pixels) width = line->width / item->canvas->pixels_per_unit; else width = line->width; if (width < (1.0 / item->canvas->pixels_per_unit)) width = 1.0 / item->canvas->pixels_per_unit; changed_miter_to_bevel = 0; for (i = num_points, coords = line_points; i >= 2; i--, coords += 2) { /* If rounding is done around the first point, then compute distance between the * point and the first point. */ if (((line->cap == GDK_CAP_ROUND) && (i == num_points)) || ((line->join == GDK_JOIN_ROUND) && (i != num_points))) { dx = coords[0] - x; dy = coords[1] - y; dist = sqrt (dx * dx + dy * dy) - width / 2.0; if (dist < GNOME_CANVAS_EPSILON) { best = 0.0; goto done; } else if (dist < best) best = dist; } /* Compute the polygonal shape corresponding to this edge, with two points for the * first point of the edge and two points for the last point of the edge. */ if (i == num_points) gnome_canvas_get_butt_points (coords[2], coords[3], coords[0], coords[1], width, (line->cap == GDK_CAP_PROJECTING), poly, poly + 1, poly + 2, poly + 3); else if ((line->join == GDK_JOIN_MITER) && !changed_miter_to_bevel) { poly[0] = poly[6]; poly[1] = poly[7]; poly[2] = poly[4]; poly[3] = poly[5]; } else { gnome_canvas_get_butt_points (coords[2], coords[3], coords[0], coords[1], width, FALSE, poly, poly + 1, poly + 2, poly + 3); /* If this line uses beveled joints, then check the distance to a polygon * comprising the last two points of the previous polygon and the first two * from this polygon; this checks the wedges that fill the mitered point. */ if ((line->join == GDK_JOIN_BEVEL) || changed_miter_to_bevel) { poly[8] = poly[0]; poly[9] = poly[1]; dist = gnome_canvas_polygon_to_point (poly, 5, x, y); if (dist < GNOME_CANVAS_EPSILON) { best = 0.0; goto done; } else if (dist < best) best = dist; changed_miter_to_bevel = FALSE; } } if (i == 2) gnome_canvas_get_butt_points (coords[0], coords[1], coords[2], coords[3], width, (line->cap == GDK_CAP_PROJECTING), poly + 4, poly + 5, poly + 6, poly + 7); else if (line->join == GDK_JOIN_MITER) { if (!gnome_canvas_get_miter_points (coords[0], coords[1], coords[2], coords[3], coords[4], coords[5], width, poly + 4, poly + 5, poly + 6, poly + 7)) { changed_miter_to_bevel = TRUE; gnome_canvas_get_butt_points (coords[0], coords[1], coords[2], coords[3], width, FALSE, poly + 4, poly + 5, poly + 6, poly + 7); } } else gnome_canvas_get_butt_points (coords[0], coords[1], coords[2], coords[3], width, FALSE, poly + 4, poly + 5, poly + 6, poly + 7); poly[8] = poly[0]; poly[9] = poly[1]; dist = gnome_canvas_polygon_to_point (poly, 5, x, y); if (dist < GNOME_CANVAS_EPSILON) { best = 0.0; goto done; } else if (dist < best) best = dist; } /* If caps are rounded, check the distance to the cap around the final end point of the line */ if (line->cap == GDK_CAP_ROUND) { dx = coords[0] - x; dy = coords[1] - y; dist = sqrt (dx * dx + dy * dy) - width / 2.0; if (dist < GNOME_CANVAS_EPSILON) { best = 0.0; goto done; } else best = dist; } /* sometimes the GnomeCanvasItem::update signal will not have been processed between deleting the arrow points and a call to this routine -- this can cause a segfault here */ if ((line->first_arrow && !line->first_coords) || (line->last_arrow && !line->last_coords)) reconfigure_arrows (line); /* If there are arrowheads, check the distance to them */ if (line->first_arrow) { dist = gnome_canvas_polygon_to_point (line->first_coords, NUM_ARROW_POINTS, x, y); if (dist < GNOME_CANVAS_EPSILON) { best = 0.0; goto done; } else best = dist; } if (line->last_arrow) { dist = gnome_canvas_polygon_to_point (line->last_coords, NUM_ARROW_POINTS, x, y); if (dist < GNOME_CANVAS_EPSILON) { best = 0.0; goto done; } else best = dist; } done: if ((line_points != static_points) && (line_points != line->coords)) g_free (line_points); return best; } static void gnome_canvas_line_bounds (GnomeCanvasItem *item, gdouble *x1, gdouble *y1, gdouble *x2, gdouble *y2) { GnomeCanvasLine *line; line = GNOME_CANVAS_LINE (item); if (line->num_points == 0) { *x1 = *y1 = *x2 = *y2 = 0.0; return; } get_bounds (line, x1, y1, x2, y2); }