504 lines
12 KiB
C
504 lines
12 KiB
C
#include <stdio.h>
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#include <math.h>
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#include <cairo.h>
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#include <libgnomecanvas/libgnomecanvas.h>
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#include "canvas-simpleline.h"
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#include "rgb_macros.h"
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#include "gettext.h"
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#define _(Text) dgettext (PACKAGE,Text)
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enum {
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PROP_0,
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PROP_X1,
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PROP_Y1,
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PROP_X2,
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PROP_Y2,
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PROP_COLOR_RGBA
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};
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static void gnome_canvas_simpleline_class_init (GnomeCanvasSimpleLineClass *class);
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static void gnome_canvas_simpleline_init (GnomeCanvasSimpleLine *simpleline);
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static void gnome_canvas_simpleline_destroy (GtkObject *object);
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static void gnome_canvas_simpleline_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static void gnome_canvas_simpleline_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static void gnome_canvas_simpleline_update (GnomeCanvasItem *item,
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double *affine,
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ArtSVP *clip_path,
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int flags);
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static void gnome_canvas_simpleline_bounds (GnomeCanvasItem *item,
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double *x1,
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double *y1,
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double *x2,
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double *y2);
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static double gnome_canvas_simpleline_point (GnomeCanvasItem *item,
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double x,
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double y,
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int cx,
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int cy,
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GnomeCanvasItem **actual_item);
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static void gnome_canvas_simpleline_render (GnomeCanvasItem *item,
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GnomeCanvasBuf *buf);
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static void gnome_canvas_simpleline_draw (GnomeCanvasItem *item,
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GdkDrawable *drawable,
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int x,
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int y,
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int w,
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int h);
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static GnomeCanvasItemClass *parent_class;
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GType
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gnome_canvas_simpleline_get_type (void)
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{
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static GType simpleline_type;
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if (!simpleline_type) {
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static const GTypeInfo object_info = {
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sizeof (GnomeCanvasSimpleLineClass),
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(GBaseInitFunc) NULL,
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(GBaseFinalizeFunc) NULL,
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(GClassInitFunc) gnome_canvas_simpleline_class_init,
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(GClassFinalizeFunc) NULL,
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NULL, /* class_data */
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sizeof (GnomeCanvasSimpleLine),
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0, /* n_preallocs */
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(GInstanceInitFunc) gnome_canvas_simpleline_init,
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NULL /* value_table */
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};
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simpleline_type = g_type_register_static (GNOME_TYPE_CANVAS_ITEM, "GnomeCanvasSimpleLine",
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&object_info, 0);
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}
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return simpleline_type;
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}
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static void
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gnome_canvas_simpleline_class_init (GnomeCanvasSimpleLineClass *class)
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{
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GObjectClass *gobject_class;
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GtkObjectClass *object_class;
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GnomeCanvasItemClass *item_class;
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gobject_class = (GObjectClass *) class;
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object_class = (GtkObjectClass *) class;
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item_class = (GnomeCanvasItemClass *) class;
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parent_class = g_type_class_peek_parent (class);
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gobject_class->set_property = gnome_canvas_simpleline_set_property;
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gobject_class->get_property = gnome_canvas_simpleline_get_property;
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g_object_class_install_property (gobject_class,
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PROP_X1,
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g_param_spec_double ("x1",
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_("x1"),
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_("x coordinate of upper left corner of rect"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_Y1,
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g_param_spec_double ("y1",
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_("y1"),
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_("y coordinate of upper left corner of rect "),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_X2,
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g_param_spec_double ("x2",
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_("x2"),
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_("x coordinate of lower right corner of rect"),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_Y2,
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g_param_spec_double ("y2",
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_("y2"),
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_("y coordinate of lower right corner of rect "),
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-G_MAXDOUBLE,
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G_MAXDOUBLE,
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0.0,
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G_PARAM_READWRITE));
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g_object_class_install_property (gobject_class,
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PROP_COLOR_RGBA,
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g_param_spec_uint ("color_rgba",
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_("color rgba"),
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_("color of line"),
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0,
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G_MAXUINT,
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0,
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G_PARAM_READWRITE));
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object_class->destroy = gnome_canvas_simpleline_destroy;
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item_class->update = gnome_canvas_simpleline_update;
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item_class->bounds = gnome_canvas_simpleline_bounds;
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item_class->point = gnome_canvas_simpleline_point;
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item_class->render = gnome_canvas_simpleline_render;
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item_class->draw = gnome_canvas_simpleline_draw;
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}
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static void
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gnome_canvas_simpleline_init (GnomeCanvasSimpleLine *simpleline)
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{
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simpleline->x1 = 0.0;
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simpleline->y1 = 0.0;
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simpleline->x2 = 0.0;
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simpleline->y2 = 0.0;
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simpleline->color = RGBA_TO_UINT(98,123,174,241);
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simpleline->horizontal = TRUE; /* reset in the _update() method */
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}
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static void
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gnome_canvas_simpleline_destroy (GtkObject *object)
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{
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GnomeCanvasSimpleLine *line;
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g_return_if_fail (object != NULL);
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g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
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line = GNOME_CANVAS_SIMPLELINE (object);
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if (GTK_OBJECT_CLASS (parent_class)->destroy)
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(* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
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}
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static void
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gnome_canvas_simpleline_bounds_world (GnomeCanvasItem *item, int* ix1, int* iy1, int* ix2, int* iy2)
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{
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double x1, x2, y1, y2;
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ArtPoint i1, i2;
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ArtPoint w1, w2;
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double i2w[6];
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GnomeCanvasSimpleLine *simpleline = GNOME_CANVAS_SIMPLELINE(item);
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gnome_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);
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i1.x = x1;
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i1.y = y1;
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i2.x = x2;
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i2.y = y2;
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gnome_canvas_item_i2w_affine (item, i2w);
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art_affine_point (&w1, &i1, i2w);
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art_affine_point (&w2, &i2, i2w);
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*ix1 = (int) rint(w1.x);
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*ix2 = (int) rint(w2.x);
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*iy1 = (int) rint(w1.y);
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*iy2 = (int) rint(w2.y);
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/* the update rect has to be of non-zero width and height */
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if (x1 == x2) {
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simpleline->horizontal = FALSE;
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*ix2 += 1;
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} else {
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simpleline->horizontal = TRUE;
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*iy2 += 1;
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}
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}
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static void
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gnome_canvas_simpleline_reset_bounds (GnomeCanvasItem *item)
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{
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int Ix1, Ix2, Iy1, Iy2;
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gnome_canvas_simpleline_bounds_world (item, &Ix1, &Iy1, &Ix2, &Iy2);
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gnome_canvas_update_bbox (item, Ix1, Iy1, Ix2, Iy2);
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}
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/*
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* CANVAS CALLBACKS
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*/
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static void
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gnome_canvas_simpleline_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GnomeCanvasSimpleLine *simpleline;
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int update = FALSE;
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int bounds_changed = FALSE;
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g_return_if_fail (object != NULL);
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g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
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simpleline = GNOME_CANVAS_SIMPLELINE (object);
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switch (prop_id) {
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case PROP_X1:
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if (simpleline->x1 != g_value_get_double (value)) {
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simpleline->x1 = g_value_get_double (value);
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bounds_changed = TRUE;
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}
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break;
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case PROP_Y1:
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if (simpleline->y1 != g_value_get_double (value)) {
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simpleline->y1 = g_value_get_double (value);
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bounds_changed = TRUE;
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}
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break;
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case PROP_X2:
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if (simpleline->x2 != g_value_get_double (value)) {
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simpleline->x2 = g_value_get_double (value);
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bounds_changed = TRUE;
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}
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break;
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case PROP_Y2:
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if (simpleline->y2 != g_value_get_double (value)) {
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simpleline->y2 = g_value_get_double (value);
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bounds_changed = TRUE;
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}
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break;
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case PROP_COLOR_RGBA:
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if (simpleline->color != g_value_get_uint(value)) {
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simpleline->color = g_value_get_uint(value);
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UINT_TO_RGBA (simpleline->color, &simpleline->r, &simpleline->g, &simpleline->b, &simpleline->a);
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update = TRUE;
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}
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break;
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default:
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break;
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}
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if (update || bounds_changed) {
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gnome_canvas_item_request_update (GNOME_CANVAS_ITEM(object));
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}
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}
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static void
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gnome_canvas_simpleline_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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g_return_if_fail (object != NULL);
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g_return_if_fail (GNOME_IS_CANVAS_SIMPLELINE (object));
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GnomeCanvasSimpleLine *line = GNOME_CANVAS_SIMPLELINE (object);
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switch (prop_id) {
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case PROP_X1:
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g_value_set_double (value, line->x1);
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break;
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case PROP_X2:
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g_value_set_double (value, line->x2);
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break;
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case PROP_Y1:
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g_value_set_double (value, line->y1);
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break;
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case PROP_Y2:
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g_value_set_double (value, line->y2);
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break;
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case PROP_COLOR_RGBA:
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g_value_set_uint (value, line->color);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gnome_canvas_simpleline_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
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{
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GnomeCanvasSimpleLine *simpleline;
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double x;
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double y;
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simpleline = GNOME_CANVAS_SIMPLELINE (item);
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if (parent_class->update)
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(* parent_class->update) (item, affine, clip_path, flags);
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gnome_canvas_simpleline_reset_bounds (item);
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x = simpleline->x1;
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y = simpleline->y1;
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gnome_canvas_item_i2w (item, &x, &y);
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gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x, y, &simpleline->bbox_ulx, &simpleline->bbox_uly);
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x = simpleline->x2;
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y = simpleline->y2;
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gnome_canvas_item_i2w (item, &x, &y);
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gnome_canvas_w2c (GNOME_CANVAS(item->canvas), x, y, &simpleline->bbox_lrx, &simpleline->bbox_lry);
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}
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static void
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gnome_canvas_simpleline_render (GnomeCanvasItem *item,
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GnomeCanvasBuf *buf)
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{
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GnomeCanvasSimpleLine *simpleline;
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int end, begin;
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simpleline = GNOME_CANVAS_SIMPLELINE (item);
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if (parent_class->render) {
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(*parent_class->render) (item, buf);
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}
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if (buf->is_bg) {
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gnome_canvas_buf_ensure_buf (buf);
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buf->is_bg = FALSE;
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}
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//begin = MAX(simpleline->bbox_ulx,buf->rect.x0);
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//end = MIN(simpleline->bbox_lrx,buf->rect.x1);
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begin = simpleline->bbox_ulx;
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end = simpleline->bbox_lrx;
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if (simpleline->color != 0) {
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if (simpleline->horizontal) {
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PAINT_HORIZA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
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begin, end, simpleline->bbox_uly);
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} else {
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PAINT_VERTA(buf, simpleline->r, simpleline->g, simpleline->b, simpleline->a,
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begin, simpleline->bbox_uly, simpleline->bbox_lry);
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}
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}
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}
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static void
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gnome_canvas_simpleline_draw (GnomeCanvasItem *item,
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GdkDrawable *drawable,
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int x, int y,
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int width, int height)
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{
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GnomeCanvasSimpleLine *simpleline;
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cairo_t* cr;
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double ulx;
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double uly;
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double lrx;
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double lry;
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simpleline = GNOME_CANVAS_SIMPLELINE (item);
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cr = gdk_cairo_create (drawable);
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if (x > simpleline->bbox_ulx) {
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ulx = x;
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} else {
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ulx = simpleline->bbox_ulx;
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}
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if (y > simpleline->bbox_uly) {
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uly = y;
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} else {
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uly = simpleline->bbox_uly;
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}
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if (x + width > simpleline->bbox_lrx) {
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lrx = simpleline->bbox_lrx;
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} else {
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lrx = x + width;
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}
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if (y + height > simpleline->bbox_lry) {
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lry = simpleline->bbox_lry;
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} else {
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lry = y + height;
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}
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ulx -= x;
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uly -= y;
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lrx -= x;
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lry -= y;
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cairo_set_source_rgba (cr,
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simpleline->r/255.0,
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simpleline->g/255.0,
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simpleline->b/255.0,
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simpleline->a/255.0);
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cairo_set_line_width (cr, 1);
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cairo_move_to (cr, ulx+0.5, uly+0.5);
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cairo_line_to (cr, lrx+0.5, lry+0.5);
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cairo_stroke (cr);
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}
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static void
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gnome_canvas_simpleline_bounds (GnomeCanvasItem *item, double *x1, double *y1, double *x2, double *y2)
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{
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GnomeCanvasSimpleLine *simpleline = GNOME_CANVAS_SIMPLELINE (item);
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*x1 = simpleline->x1;
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*y1 = simpleline->y1;
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*x2 = simpleline->x2;
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*y2 = simpleline->y2;
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}
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static double
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gnome_canvas_simpleline_point (GnomeCanvasItem *item, double x, double y, int cx, int cy, GnomeCanvasItem **actual_item)
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{
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GnomeCanvasSimpleLine *simpleline;
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double x1, y1, x2, y2;
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double dx, dy;
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simpleline = GNOME_CANVAS_SIMPLELINE (item);
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*actual_item = item;
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/* Find the bounds for the line plus its outline width */
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gnome_canvas_simpleline_bounds (item, &x1, &y1, &x2, &y2);
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/* Is point inside line */
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if ((x >= x1) && (y >= y1) && (x <= x2) && (y <= y2)) {
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return 0.0;
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}
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/* Point is outside line */
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if (x < x1)
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dx = x1 - x;
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else if (x > x2)
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dx = x - x2;
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else
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dx = 0.0;
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if (y < y1)
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dy = y1 - y;
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else if (y > y2)
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dy = y - y2;
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else
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dy = 0.0;
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return sqrt (dx * dx + dy * dy);
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}
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