/* -*- Mode: C; tab-width: 8; indent-tabs-mode: 8; c-basic-offset: 8 -*- */ /* * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation * All rights reserved. * * This file is part of the Mate Library. * * The Mate 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 Mate 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 Mate Library; see the file COPYING.LIB. If not, * write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /* @NOTATION@ */ /* Rectangle and ellipse item types for EelCanvas widget * * EelCanvas 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 <federico@nuclecu.unam.mx> */ #include <config.h> #include <math.h> #include "eel-canvas-rect-ellipse.h" #include "eel-canvas-util.h" #include <string.h> #ifdef HAVE_RENDER #include <gdk/gdkx.h> #include <X11/extensions/Xrender.h> #endif /* Base class for rectangle and ellipse item types */ #define noVERBOSE enum { PROP_0, PROP_X1, PROP_Y1, PROP_X2, PROP_Y2, #if !GTK_CHECK_VERSION(3,0,0) PROP_FILL_COLOR, PROP_FILL_COLOR_GDK, #endif PROP_FILL_COLOR_RGBA, #if !GTK_CHECK_VERSION(3,0,0) PROP_OUTLINE_COLOR, PROP_OUTLINE_COLOR_GDK, #endif PROP_OUTLINE_COLOR_RGBA, PROP_OUTLINE_STIPPLING, PROP_WIDTH_PIXELS, PROP_WIDTH_UNITS }; static void eel_canvas_re_class_init (EelCanvasREClass *klass); static void eel_canvas_re_init (EelCanvasRE *re); static void eel_canvas_re_set_property (GObject *object, guint param_id, const GValue *value, GParamSpec *pspec); static void eel_canvas_re_get_property (GObject *object, guint param_id, GValue *value, GParamSpec *pspec); static void eel_canvas_re_update_shared (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags); static void eel_canvas_re_realize (EelCanvasItem *item); static void eel_canvas_re_unrealize (EelCanvasItem *item); static void eel_canvas_re_bounds (EelCanvasItem *item, double *x1, double *y1, double *x2, double *y2); static void eel_canvas_re_translate (EelCanvasItem *item, double dx, double dy); static void eel_canvas_rect_update (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags); static void eel_canvas_ellipse_update (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags); typedef struct { /*< public >*/ int x0, y0, x1, y1; } Rect; static Rect make_rect (int x0, int y0, int x1, int y1); static void diff_rects (Rect r1, Rect r2, int *count, Rect result[4]); static EelCanvasItemClass *re_parent_class; static EelCanvasREClass *rect_parent_class; GType eel_canvas_re_get_type (void) { static GType re_type = 0; if (!re_type) { GTypeInfo re_info = { sizeof (EelCanvasREClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) eel_canvas_re_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (EelCanvasRE), 0, /* n_preallocs */ (GInstanceInitFunc) eel_canvas_re_init }; re_type = g_type_register_static (eel_canvas_item_get_type (), "EelCanvasRE", &re_info, 0); } return re_type; } static void eel_canvas_re_class_init (EelCanvasREClass *klass) { GObjectClass *gobject_class; EelCanvasItemClass *item_class; gobject_class = (GObjectClass *) klass; item_class = (EelCanvasItemClass *) klass; re_parent_class = g_type_class_peek_parent (klass); gobject_class->set_property = eel_canvas_re_set_property; gobject_class->get_property = eel_canvas_re_get_property; g_object_class_install_property (gobject_class, PROP_X1, g_param_spec_double ("x1", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_Y1, g_param_spec_double ("y1", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_X2, g_param_spec_double ("x2", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_Y2, g_param_spec_double ("y2", NULL, NULL, -G_MAXDOUBLE, G_MAXDOUBLE, 0, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, #if GTK_CHECK_VERSION(3,0,0) PROP_FILL_COLOR_RGBA, g_param_spec_boxed ("fill-color-rgba", NULL, NULL, GDK_TYPE_RGBA, #else PROP_FILL_COLOR, g_param_spec_string ("fill-color", NULL, NULL, NULL, G_PARAM_READWRITE)); 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_READWRITE)); 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_READWRITE)); g_object_class_install_property (gobject_class, PROP_OUTLINE_COLOR, g_param_spec_string ("outline-color", NULL, NULL, NULL, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_OUTLINE_COLOR_GDK, g_param_spec_boxed ("outline-color-gdk", NULL, NULL, GDK_TYPE_COLOR, #endif G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_OUTLINE_COLOR_RGBA, #if GTK_CHECK_VERSION(3,0,0) g_param_spec_boxed ("outline-color-rgba", NULL, NULL, GDK_TYPE_RGBA, G_PARAM_READWRITE)); #else g_param_spec_uint ("outline-color-rgba", NULL, NULL, 0, G_MAXUINT, 0, G_PARAM_READWRITE)); #endif g_object_class_install_property (gobject_class, PROP_OUTLINE_STIPPLING, g_param_spec_boolean ("outline-stippling", NULL, NULL, FALSE, G_PARAM_READWRITE)); g_object_class_install_property (gobject_class, PROP_WIDTH_PIXELS, g_param_spec_uint ("width-pixels", NULL, NULL, 0, G_MAXUINT, 0, G_PARAM_READWRITE)); 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_READWRITE)); item_class->realize = eel_canvas_re_realize; item_class->unrealize = eel_canvas_re_unrealize; item_class->translate = eel_canvas_re_translate; item_class->bounds = eel_canvas_re_bounds; } static void eel_canvas_re_init (EelCanvasRE *re) { re->x1 = 0.0; re->y1 = 0.0; re->x2 = 0.0; re->y2 = 0.0; re->width = 0.0; } static void get_bounds (EelCanvasRE *re, double *px1, double *py1, double *px2, double *py2) { EelCanvasItem *item; double x1, y1, x2, y2; int cx1, cy1, cx2, cy2; double hwidth; #ifdef VERBOSE g_print ("re get_bounds\n"); #endif item = EEL_CANVAS_ITEM (re); if (re->width_pixels) hwidth = (re->width / item->canvas->pixels_per_unit) / 2.0; else hwidth = re->width / 2.0; x1 = re->x1; y1 = re->y1; x2 = re->x2; y2 = re->y2; eel_canvas_item_i2w (item, &x1, &y1); eel_canvas_item_i2w (item, &x2, &y2); eel_canvas_w2c (item->canvas, x1 - hwidth, y1 - hwidth, &cx1, &cy1); eel_canvas_w2c (item->canvas, x2 + hwidth, y2 + hwidth, &cx2, &cy2); *px1 = cx1; *py1 = cy1; *px2 = cx2; *py2 = cy2; /* Some safety fudging */ *px1 -= 2; *py1 -= 2; *px2 += 2; *py2 += 2; } static void eel_canvas_re_set_fill (EelCanvasRE *re, gboolean fill_set) { if (re->fill_set != fill_set) { re->fill_set = fill_set; eel_canvas_item_request_update (EEL_CANVAS_ITEM (re)); } } static void eel_canvas_re_set_outline (EelCanvasRE *re, gboolean outline_set) { if (re->outline_set != outline_set) { re->outline_set = outline_set; eel_canvas_item_request_update (EEL_CANVAS_ITEM (re)); } } static void eel_canvas_re_set_property (GObject *object, guint param_id, const GValue *value, GParamSpec *pspec) { EelCanvasItem *item; EelCanvasRE *re; #if !GTK_CHECK_VERSION(3,0,0) GdkColor color = { 0, 0, 0, 0, }; GdkColor *pcolor; #endif g_return_if_fail (object != NULL); g_return_if_fail (EEL_IS_CANVAS_RE (object)); item = EEL_CANVAS_ITEM (object); re = EEL_CANVAS_RE (object); switch (param_id) { case PROP_X1: re->x1 = g_value_get_double (value); eel_canvas_item_request_update (item); break; case PROP_Y1: re->y1 = g_value_get_double (value); eel_canvas_item_request_update (item); break; case PROP_X2: re->x2 = g_value_get_double (value); eel_canvas_item_request_update (item); break; case PROP_Y2: re->y2 = g_value_get_double (value); eel_canvas_item_request_update (item); break; #if GTK_CHECK_VERSION(3,0,0) case PROP_FILL_COLOR_RGBA: { GdkRGBA *color; color = g_value_get_boxed (value); eel_canvas_re_set_fill (re, color != NULL); if (color != NULL) { re->fill_color = *color; } eel_canvas_item_request_redraw (item); break; } case PROP_OUTLINE_COLOR_RGBA: { GdkRGBA *color; color = g_value_get_boxed (value); eel_canvas_re_set_outline (re, color != NULL); if (color != NULL) { re->outline_color = *color; } eel_canvas_item_request_redraw (item); break; } #else case PROP_FILL_COLOR: case PROP_FILL_COLOR_GDK: case PROP_FILL_COLOR_RGBA: switch (param_id) { case PROP_FILL_COLOR: if (g_value_get_string (value) && gdk_color_parse (g_value_get_string (value), &color)) eel_canvas_re_set_fill (re, TRUE); else eel_canvas_re_set_fill (re, FALSE); re->fill_color = ((color.red & 0xff00) << 16 | (color.green & 0xff00) << 8 | (color.blue & 0xff00) | 0xff); break; case PROP_FILL_COLOR_GDK: pcolor = g_value_get_boxed (value); eel_canvas_re_set_fill (re, pcolor != NULL); if (pcolor) { color = *pcolor; } re->fill_color = ((color.red & 0xff00) << 16 | (color.green & 0xff00) << 8 | (color.blue & 0xff00) | 0xff); break; case PROP_FILL_COLOR_RGBA: eel_canvas_re_set_fill (re, TRUE); re->fill_color = g_value_get_uint (value); break; } #ifdef VERBOSE g_print ("re fill color = %08x\n", re->fill_color); #endif eel_canvas_item_request_redraw (item); break; case PROP_OUTLINE_COLOR: case PROP_OUTLINE_COLOR_GDK: case PROP_OUTLINE_COLOR_RGBA: switch (param_id) { case PROP_OUTLINE_COLOR: if (g_value_get_string (value) && gdk_color_parse (g_value_get_string (value), &color)) eel_canvas_re_set_outline (re, TRUE); else eel_canvas_re_set_outline (re, FALSE); re->outline_color = ((color.red & 0xff00) << 16 | (color.green & 0xff00) << 8 | (color.blue & 0xff00) | 0xff); break; case PROP_OUTLINE_COLOR_GDK: pcolor = g_value_get_boxed (value); eel_canvas_re_set_outline (re, pcolor != NULL); if (pcolor) { color = *pcolor; } re->outline_color = ((color.red & 0xff00) << 16 | (color.green & 0xff00) << 8 | (color.blue & 0xff00) | 0xff); break; case PROP_OUTLINE_COLOR_RGBA: eel_canvas_re_set_outline (re, TRUE); re->outline_color = g_value_get_uint (value); break; } #ifdef VERBOSE g_print ("re outline color %x %x %x\n", color.red, color.green, color.blue); #endif eel_canvas_item_request_redraw (item); break; #endif case PROP_OUTLINE_STIPPLING: re->outline_stippling = g_value_get_boolean (value); eel_canvas_item_request_redraw (item); break; case PROP_WIDTH_PIXELS: re->width = g_value_get_uint (value); re->width_pixels = TRUE; eel_canvas_item_request_update (item); break; case PROP_WIDTH_UNITS: re->width = fabs (g_value_get_double (value)); re->width_pixels = FALSE; eel_canvas_item_request_update (item); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); break; } } #if !GTK_CHECK_VERSION(3,0,0) /* Allocates a GdkColor structure filled with the specified pixel, and puts it into the specified * value for returning it in the get_property method. */ static void get_color_value (EelCanvasRE *re, gulong pixel, GValue *value) { GdkColor color; color.red = (pixel >> 16) & 0xFF; color.green = (pixel >> 8) & 0xFF; color.blue = pixel & 0xFF; color.red |= color.red << 8; color.green |= color.green << 8; color.blue |= color.blue << 8; g_value_set_boxed (value, &color); } #endif static void eel_canvas_re_get_property (GObject *object, guint param_id, GValue *value, GParamSpec *pspec) { EelCanvasRE *re; g_return_if_fail (object != NULL); g_return_if_fail (EEL_IS_CANVAS_RE (object)); re = EEL_CANVAS_RE (object); switch (param_id) { case PROP_X1: g_value_set_double (value, re->x1); break; case PROP_Y1: g_value_set_double (value, re->y1); break; case PROP_X2: g_value_set_double (value, re->x2); break; case PROP_Y2: g_value_set_double (value, re->y2); break; #if GTK_CHECK_VERSION(3,0,0) case PROP_FILL_COLOR_RGBA: g_value_set_boxed (value, &re->fill_color); break; case PROP_OUTLINE_COLOR_RGBA: g_value_set_boxed (value, &re->outline_color); #else case PROP_FILL_COLOR_GDK: get_color_value (re, re->fill_color, value); break; case PROP_OUTLINE_COLOR_GDK: get_color_value (re, re->outline_color, value); break; case PROP_FILL_COLOR_RGBA: g_value_set_uint (value, re->fill_color); break; case PROP_OUTLINE_COLOR_RGBA: g_value_set_uint (value, re->outline_color); #endif break; case PROP_OUTLINE_STIPPLING: g_value_set_boolean (value, re->outline_stippling); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec); break; } } static void eel_canvas_re_update_shared (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags) { #ifdef VERBOSE g_print ("eel_canvas_re_update_shared\n"); #endif if (re_parent_class->update) (* re_parent_class->update) (item, i2w_dx, i2w_dy, flags); } static void eel_canvas_re_realize (EelCanvasItem *item) { #ifdef VERBOSE g_print ("eel_canvas_re_realize\n"); #endif if (re_parent_class->realize) (* re_parent_class->realize) (item); } static void eel_canvas_re_unrealize (EelCanvasItem *item) { if (re_parent_class->unrealize) (* re_parent_class->unrealize) (item); } static void eel_canvas_re_translate (EelCanvasItem *item, double dx, double dy) { EelCanvasRE *re; #ifdef VERBOSE g_print ("eel_canvas_re_translate\n"); #endif re = EEL_CANVAS_RE (item); re->x1 += dx; re->y1 += dy; re->x2 += dx; re->y2 += dy; } static void eel_canvas_re_bounds (EelCanvasItem *item, double *x1, double *y1, double *x2, double *y2) { EelCanvasRE *re; double hwidth; #ifdef VERBOSE g_print ("eel_canvas_re_bounds\n"); #endif re = EEL_CANVAS_RE (item); if (re->width_pixels) hwidth = (re->width / item->canvas->pixels_per_unit) / 2.0; else hwidth = re->width / 2.0; *x1 = re->x1 - hwidth; *y1 = re->y1 - hwidth; *x2 = re->x2 + hwidth; *y2 = re->y2 + hwidth; } /* Rectangle item */ static void eel_canvas_rect_class_init (EelCanvasRectClass *klass); static void eel_canvas_rect_init (EelCanvasRect *rect); static void eel_canvas_rect_finalize (GObject *object); static void eel_canvas_rect_realize (EelCanvasItem *item); #if GTK_CHECK_VERSION(3,0,0) static void eel_canvas_rect_draw (EelCanvasItem *item, cairo_t *cr, cairo_region_t *region); #else static void eel_canvas_rect_draw (EelCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose); #endif static double eel_canvas_rect_point (EelCanvasItem *item, double x, double y, int cx, int cy, EelCanvasItem **actual_item); struct _EelCanvasRectPrivate { Rect last_update_rect; Rect last_outline_update_rect; int last_outline_update_width; #ifdef HAVE_RENDER gboolean use_render; XRenderPictFormat *format; #endif }; GType eel_canvas_rect_get_type (void) { static GType rect_type = 0; if (!rect_type) { GTypeInfo rect_info = { sizeof (EelCanvasRectClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) eel_canvas_rect_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (EelCanvasRect), 0, /* n_preallocs */ (GInstanceInitFunc) eel_canvas_rect_init }; rect_type = g_type_register_static (eel_canvas_re_get_type (), "EelCanvasRect", &rect_info, 0); } return rect_type; } static void eel_canvas_rect_class_init (EelCanvasRectClass *klass) { EelCanvasItemClass *item_class; rect_parent_class = g_type_class_peek_parent (klass); item_class = (EelCanvasItemClass *) klass; item_class->draw = eel_canvas_rect_draw; item_class->point = eel_canvas_rect_point; item_class->update = eel_canvas_rect_update; item_class->realize = eel_canvas_rect_realize; G_OBJECT_CLASS (klass)->finalize = eel_canvas_rect_finalize; } static void eel_canvas_rect_init (EelCanvasRect *rect) { rect->priv = g_new0 (EelCanvasRectPrivate, 1); } static void eel_canvas_rect_finalize (GObject *object) { EelCanvasRect *rect = EEL_CANVAS_RECT (object); if (rect->priv) { g_free (rect->priv); } G_OBJECT_CLASS (rect_parent_class)->finalize (object); } static void eel_canvas_rect_realize (EelCanvasItem *item) { #ifdef HAVE_RENDER EelCanvasRectPrivate *priv; int event_base, error_base; Display *dpy; priv = EEL_CANVAS_RECT (item)->priv; dpy = GDK_WINDOW_XDISPLAY (gtk_widget_get_window (GTK_WIDGET (item->canvas))); priv->use_render = XRenderQueryExtension (dpy, &event_base, &error_base); if (priv->use_render) { GdkVisual *gdk_visual; Visual *visual; gdk_visual = gtk_widget_get_visual (GTK_WIDGET (item->canvas)); visual = gdk_x11_visual_get_xvisual (gdk_visual); priv->format = XRenderFindVisualFormat (dpy, visual); } #endif if (EEL_CANVAS_ITEM_CLASS (rect_parent_class)->realize) { (* EEL_CANVAS_ITEM_CLASS (rect_parent_class)->realize) (item); } } static void eel_canvas_set_source_color (cairo_t *cr, #if GTK_CHECK_VERSION(3,0,0) GdkRGBA *rgba) { gdk_cairo_set_source_rgba (cr, rgba); #else guint rgba) { cairo_set_source_rgba (cr, ((rgba >> 24) & 0xff) / 255., ((rgba >> 16) & 0xff) / 255., ((rgba >> 8) & 0xff) / 255., ((rgba >> 0) & 0xff) / 255.); #endif } #define DASH_ON 0.8 #define DASH_OFF 1.7 static void #if GTK_CHECK_VERSION(3,0,0) eel_canvas_rect_draw (EelCanvasItem *item, cairo_t *cr, cairo_region_t *region) #else eel_canvas_rect_draw (EelCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose) #endif { EelCanvasRE *re; double x1, y1, x2, y2; int cx1, cy1, cx2, cy2; double i2w_dx, i2w_dy; re = EEL_CANVAS_RE (item); /* Get canvas pixel coordinates */ i2w_dx = 0.0; i2w_dy = 0.0; eel_canvas_item_i2w (item, &i2w_dx, &i2w_dy); x1 = re->x1 + i2w_dx; y1 = re->y1 + i2w_dy; x2 = re->x2 + i2w_dx; y2 = re->y2 + i2w_dy; eel_canvas_w2c (item->canvas, x1, y1, &cx1, &cy1); eel_canvas_w2c (item->canvas, x2, y2, &cx2, &cy2); if (cx2 <= cx1 || cy2 <= cy1 ) { return; } #if GTK_CHECK_VERSION(3,0,0) cairo_save (cr); #else cairo_t *cr = gdk_cairo_create (drawable); gdk_cairo_region (cr, expose->region); cairo_clip (cr); #endif if (re->fill_set) { #if GTK_CHECK_VERSION(3,0,0) eel_canvas_set_source_color (cr, &re->fill_color); #else eel_canvas_set_source_color (cr, re->fill_color); #endif cairo_rectangle (cr, cx1, cy1, cx2 - cx1 + 1, cy2 - cy1 + 1); cairo_fill (cr); } if (re->outline_set) { #if GTK_CHECK_VERSION(3,0,0) eel_canvas_set_source_color (cr, &re->outline_color); #else eel_canvas_set_source_color (cr, re->outline_color); #endif if (re->width_pixels) { cairo_set_line_width (cr, (int) re->width); } else { cairo_set_line_width (cr, (int) (re->width * re->item.canvas->pixels_per_unit + 0.5)); } if (re->outline_stippling) { double dash[2] = { DASH_ON, DASH_OFF }; cairo_set_dash (cr, dash, G_N_ELEMENTS (dash), 0); } cairo_rectangle (cr, cx1 + 0.5, cy1 + 0.5, cx2 - cx1, cy2 - cy1); cairo_stroke (cr); } #if GTK_CHECK_VERSION(3,0,0) cairo_restore (cr); #else cairo_destroy (cr); #endif } static double eel_canvas_rect_point (EelCanvasItem *item, double x, double y, int cx, int cy, EelCanvasItem **actual_item) { EelCanvasRE *re; double x1, y1, x2, y2; double hwidth; double dx, dy; double tmp; #ifdef VERBOSE g_print ("eel_canvas_rect_point\n"); #endif re = EEL_CANVAS_RE (item); *actual_item = item; /* Find the bounds for the rectangle plus its outline width */ x1 = re->x1; y1 = re->y1; x2 = re->x2; y2 = re->y2; if (re->outline_set) { if (re->width_pixels) hwidth = (re->width / item->canvas->pixels_per_unit) / 2.0; else hwidth = re->width / 2.0; x1 -= hwidth; y1 -= hwidth; x2 += hwidth; y2 += hwidth; } else hwidth = 0.0; /* Is point inside rectangle (which can be hollow if it has no fill set)? */ if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) { if (re->fill_set || !re->outline_set) return 0.0; dx = x - x1; tmp = x2 - x; if (tmp < dx) dx = tmp; dy = y - y1; tmp = y2 - y; if (tmp < dy) dy = tmp; if (dy < dx) dx = dy; dx -= 2.0 * hwidth; if (dx < 0.0) return 0.0; else return dx; } /* Point is outside rectangle */ if (x < x1) dx = x1 - x; else if (x > x2) dx = x - x2; else dx = 0.0; if (y < y1) dy = y1 - y; else if (y > y2) dy = y - y2; else dy = 0.0; return sqrt (dx * dx + dy * dy); } static void request_redraw_borders (EelCanvas *canvas, Rect *update_rect, int width) { eel_canvas_request_redraw (canvas, update_rect->x0, update_rect->y0, update_rect->x1, update_rect->y0 + width); eel_canvas_request_redraw (canvas, update_rect->x0, update_rect->y1-width, update_rect->x1, update_rect->y1); eel_canvas_request_redraw (canvas, update_rect->x0, update_rect->y0, update_rect->x0+width, update_rect->y1); eel_canvas_request_redraw (canvas, update_rect->x1-width, update_rect->y0, update_rect->x1, update_rect->y1); } static void eel_canvas_rect_update (EelCanvasItem *item, double i2w_dx, double i2w_dy, gint flags) { EelCanvasRE *re; double x1, y1, x2, y2; int cx1, cy1, cx2, cy2; int repaint_rects_count, i; int width_pixels; int width_lt, width_rb; Rect update_rect, repaint_rects[4]; EelCanvasRectPrivate *priv; eel_canvas_re_update_shared (item, i2w_dx, i2w_dy, flags); re = EEL_CANVAS_RE (item); priv = EEL_CANVAS_RECT (item)->priv; x1 = re->x1 + i2w_dx; y1 = re->y1 + i2w_dy; x2 = re->x2 + i2w_dx; y2 = re->y2 + i2w_dy; eel_canvas_w2c (item->canvas, x1, y1, &cx1, &cy1); eel_canvas_w2c (item->canvas, x2, y2, &cx2, &cy2); update_rect = make_rect (cx1, cy1, cx2+1, cy2+1); #if 0 eel_canvas_request_redraw (item->canvas, update_rect.x0, update_rect.y0, update_rect.x1, update_rect.y1); eel_canvas_request_redraw (item->canvas, priv->last_update_rect.x0, priv->last_update_rect.y0, priv->last_update_rect.x1, priv->last_update_rect.y1); #else diff_rects (update_rect, priv->last_update_rect, &repaint_rects_count, repaint_rects); for (i = 0; i < repaint_rects_count; i++) { eel_canvas_request_redraw (item->canvas, repaint_rects[i].x0, repaint_rects[i].y0, repaint_rects[i].x1, repaint_rects[i].y1); } #endif priv->last_update_rect = update_rect; if (re->outline_set) { /* Outline and bounding box */ if (re->width_pixels) width_pixels = (int) re->width; else width_pixels = (int) floor (re->width * re->item.canvas->pixels_per_unit + 0.5); width_lt = width_pixels / 2; width_rb = (width_pixels + 1) / 2; cx1 -= width_lt; cy1 -= width_lt; cx2 += width_rb; cy2 += width_rb; update_rect = make_rect (cx1, cy1, cx2, cy2); request_redraw_borders (item->canvas, &update_rect, (width_lt + width_rb)); request_redraw_borders (item->canvas, &priv->last_outline_update_rect, priv->last_outline_update_width); priv->last_outline_update_rect = update_rect; priv->last_outline_update_width = width_lt + width_rb; item->x1 = cx1; item->y1 = cy1; item->x2 = cx2+1; item->y2 = cy2+1; } else { item->x1 = cx1; item->y1 = cy1; item->x2 = cx2+1; item->y2 = cy2+1; } } /* Ellipse item */ static void eel_canvas_ellipse_class_init (EelCanvasEllipseClass *klass); #if GTK_CHECK_VERSION(3,0,0) static void eel_canvas_ellipse_draw (EelCanvasItem *item, cairo_t *cr, cairo_region_t *region); #else static void eel_canvas_ellipse_draw (EelCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose); #endif static double eel_canvas_ellipse_point (EelCanvasItem *item, double x, double y, int cx, int cy, EelCanvasItem **actual_item); GType eel_canvas_ellipse_get_type (void) { static GType ellipse_type = 0; if (!ellipse_type) { GTypeInfo ellipse_info = { sizeof (EelCanvasEllipseClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) eel_canvas_ellipse_class_init, NULL, /* class_finalize */ NULL, /* class_data */ sizeof (EelCanvasEllipse), 0, /* n_preallocs */ (GInstanceInitFunc) NULL }; ellipse_type = g_type_register_static (eel_canvas_re_get_type (), "EelCanvasEllipse", &ellipse_info, 0); } return ellipse_type; } static void eel_canvas_ellipse_class_init (EelCanvasEllipseClass *klass) { EelCanvasItemClass *item_class; item_class = (EelCanvasItemClass *) klass; item_class->draw = eel_canvas_ellipse_draw; item_class->point = eel_canvas_ellipse_point; item_class->update = eel_canvas_ellipse_update; } static void #if GTK_CHECK_VERSION(3,0,0) eel_canvas_ellipse_draw (EelCanvasItem *item, cairo_t *cr, cairo_region_t *region) #else eel_canvas_ellipse_draw (EelCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose) #endif { EelCanvasRE *re; int x1, y1, x2, y2; double i2w_dx, i2w_dy; re = EEL_CANVAS_RE (item); /* Get canvas pixel coordinates */ i2w_dx = 0.0; i2w_dy = 0.0; eel_canvas_item_i2w (item, &i2w_dx, &i2w_dy); eel_canvas_w2c (item->canvas, re->x1 + i2w_dx, re->y1 + i2w_dy, &x1, &y1); eel_canvas_w2c (item->canvas, re->x2 + i2w_dx, re->y2 + i2w_dy, &x2, &y2); #if GTK_CHECK_VERSION(3,0,0) cairo_save (cr); #else cairo_t *cr = gdk_cairo_create (drawable); gdk_cairo_region (cr, expose->region); cairo_clip (cr); #endif cairo_save (cr); cairo_translate (cr, (x1 + x2) / 2., (y1 + y2) / 2.); cairo_scale (cr, (x2 - x1), (y2 - y1)); cairo_arc (cr, 0, 0, 1, 0, 2 * G_PI); cairo_restore (cr); if (re->fill_set) { #if GTK_CHECK_VERSION(3,0,0) eel_canvas_set_source_color (cr, &re->fill_color); #else eel_canvas_set_source_color (cr, re->fill_color); #endif cairo_fill_preserve (cr); } if (re->outline_set) { #if GTK_CHECK_VERSION(3,0,0) eel_canvas_set_source_color (cr, &re->outline_color); #else eel_canvas_set_source_color (cr, re->outline_color); #endif if (re->width_pixels) { cairo_set_line_width (cr, (int) re->width); } else { cairo_set_line_width (cr, (int) (re->width * re->item.canvas->pixels_per_unit + 0.5)); } cairo_stroke_preserve (cr); } #if GTK_CHECK_VERSION(3,0,0) cairo_restore (cr); #else cairo_destroy (cr); #endif } static double eel_canvas_ellipse_point (EelCanvasItem *item, double x, double y, int cx, int cy, EelCanvasItem **actual_item) { EelCanvasRE *re; double dx, dy; double scaled_dist; double outline_dist; double center_dist; double width; double a, b; double diamx, diamy; re = EEL_CANVAS_RE (item); *actual_item = item; if (re->outline_set) { if (re->width_pixels) width = re->width / item->canvas->pixels_per_unit; else width = re->width; } else width = 0.0; /* Compute the distance between the center of the ellipse and the point, with the ellipse * considered as being scaled to a circle. */ dx = x - (re->x1 + re->x2) / 2.0; dy = y - (re->y1 + re->y2) / 2.0; center_dist = sqrt (dx * dx + dy * dy); a = dx / ((re->x2 + width - re->x1) / 2.0); b = dy / ((re->y2 + width - re->y1) / 2.0); scaled_dist = sqrt (a * a + b * b); /* If the scaled distance is greater than 1, then we are outside. Compute the distance from * the point to the edge of the circle, then scale back to the original un-scaled coordinate * system. */ if (scaled_dist > 1.0) return (center_dist / scaled_dist) * (scaled_dist - 1.0); /* We are inside the outer edge of the ellipse. If it is filled, then we are "inside". * Otherwise, do the same computation as above, but also check whether we are inside the * outline. */ if (re->fill_set) return 0.0; if (scaled_dist > EEL_CANVAS_EPSILON) outline_dist = (center_dist / scaled_dist) * (1.0 - scaled_dist) - width; else { /* Handle very small distance */ diamx = re->x2 - re->x1; diamy = re->y2 - re->y1; if (diamx < diamy) outline_dist = (diamx - width) / 2.0; else outline_dist = (diamy - width) / 2.0; } if (outline_dist < 0.0) return 0.0; return outline_dist; } static void eel_canvas_ellipse_update (EelCanvasItem *item, double i2w_dx, double i2w_dy, gint flags) { EelCanvasRE *re; double x0, y0, x1, y1; #ifdef VERBOSE g_print ("eel_canvas_sllipse_update item %x\n", item); #endif eel_canvas_re_update_shared (item, i2w_dx, i2w_dy, flags); re = EEL_CANVAS_RE (item); get_bounds (re, &x0, &y0, &x1, &y1); eel_canvas_update_bbox (item, x0, y0, x1, y1); } static int rect_empty (const Rect *src) { return (src->x1 <= src->x0 || src->y1 <= src->y0); } static Rect make_rect (int x0, int y0, int x1, int y1) { Rect r; r.x0 = x0; r.y0 = y0; r.x1 = x1; r.y1 = y1; return r; } static gboolean rects_intersect (Rect r1, Rect r2) { if (r1.x0 >= r2.x1) { return FALSE; } if (r2.x0 >= r1.x1) { return FALSE; } if (r1.y0 >= r2.y1) { return FALSE; } if (r2.y0 >= r1.y1) { return FALSE; } return TRUE; } static void diff_rects_guts (Rect ra, Rect rb, int *count, Rect result[4]) { if (ra.x0 < rb.x0) { result[(*count)++] = make_rect (ra.x0, ra.y0, rb.x0, ra.y1); } if (ra.y0 < rb.y0) { result[(*count)++] = make_rect (ra.x0, ra.y0, ra.x1, rb.y0); } if (ra.x1 < rb.x1) { result[(*count)++] = make_rect (ra.x1, rb.y0, rb.x1, rb.y1); } if (ra.y1 < rb.y1) { result[(*count)++] = make_rect (rb.x0, ra.y1, rb.x1, rb.y1); } } static void diff_rects (Rect r1, Rect r2, int *count, Rect result[4]) { g_assert (count != NULL); g_assert (result != NULL); *count = 0; if (rects_intersect (r1, r2)) { diff_rects_guts (r1, r2, count, result); diff_rects_guts (r2, r1, count, result); } else { if (!rect_empty (&r1)) { result[(*count)++] = r1; } if (!rect_empty (&r2)) { result[(*count)++] = r2; } } }