1 #define __SP_GUIDELINE_C__
3 /*
4 * Infinite horizontal/vertical line
5 *
6 * Author:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 *
9 * Copyright (C) 2000-2002 Lauris Kaplinski
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
15 #include <libnr/nr-pixops.h>
16 #include "display-forward.h"
17 #include "sp-canvas-util.h"
18 #include "guideline.h"
20 static void sp_guideline_class_init(SPGuideLineClass *c);
21 static void sp_guideline_init(SPGuideLine *guideline);
22 static void sp_guideline_destroy(GtkObject *object);
24 static void sp_guideline_update(SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags);
25 static void sp_guideline_render(SPCanvasItem *item, SPCanvasBuf *buf);
27 static double sp_guideline_point(SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item);
29 static SPCanvasItemClass *parent_class;
31 GType sp_guideline_get_type()
32 {
33 static GType guideline_type = 0;
35 if (!guideline_type) {
36 static const GTypeInfo guideline_info =
37 {
38 sizeof (SPGuideLineClass),
39 NULL, NULL,
40 (GClassInitFunc) sp_guideline_class_init,
41 NULL, NULL,
42 sizeof (SPGuideLine),
43 16,
44 (GInstanceInitFunc) sp_guideline_init,
45 NULL,
46 };
48 guideline_type = g_type_register_static(SP_TYPE_CANVAS_ITEM, "SPGuideLine", &guideline_info, (GTypeFlags) 0);
49 }
51 return guideline_type;
52 }
54 static void sp_guideline_class_init(SPGuideLineClass *c)
55 {
56 parent_class = (SPCanvasItemClass*) g_type_class_peek_parent(c);
58 GtkObjectClass *object_class = (GtkObjectClass *) c;
59 object_class->destroy = sp_guideline_destroy;
61 SPCanvasItemClass *item_class = (SPCanvasItemClass *) c;
62 item_class->update = sp_guideline_update;
63 item_class->render = sp_guideline_render;
64 item_class->point = sp_guideline_point;
65 }
67 static void sp_guideline_init(SPGuideLine *gl)
68 {
69 gl->rgba = 0x0000ff7f;
71 gl->vertical = 0;
72 gl->sensitive = 0;
73 }
75 static void sp_guideline_destroy(GtkObject *object)
76 {
77 GTK_OBJECT_CLASS(parent_class)->destroy(object);
78 }
80 static void sp_guideline_render(SPCanvasItem *item, SPCanvasBuf *buf)
81 {
82 SPGuideLine const *gl = SP_GUIDELINE (item);
84 sp_canvas_prepare_buffer(buf);
86 unsigned int const r = NR_RGBA32_R (gl->rgba);
87 unsigned int const g = NR_RGBA32_G (gl->rgba);
88 unsigned int const b = NR_RGBA32_B (gl->rgba);
89 unsigned int const a = NR_RGBA32_A (gl->rgba);
91 int p0, p1, step;
92 unsigned char *d;
94 if (gl->vertical) {
96 if (gl->position < buf->rect.x0 || gl->position >= buf->rect.x1) {
97 return;
98 }
100 p0 = buf->rect.y0;
101 p1 = buf->rect.y1;
102 step = buf->buf_rowstride;
103 d = buf->buf + 3 * (gl->position - buf->rect.x0);
105 } else {
107 if (gl->position < buf->rect.y0 || gl->position >= buf->rect.y1) {
108 return;
109 }
111 p0 = buf->rect.x0;
112 p1 = buf->rect.x1;
113 step = 3;
114 d = buf->buf + (gl->position - buf->rect.y0) * buf->buf_rowstride;
115 }
117 for (int p = p0; p < p1; p++) {
118 d[0] = NR_COMPOSEN11(r, a, d[0]);
119 d[1] = NR_COMPOSEN11(g, a, d[1]);
120 d[2] = NR_COMPOSEN11(b, a, d[2]);
121 d += step;
122 }
123 }
125 static void sp_guideline_update(SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags)
126 {
127 SPGuideLine *gl = SP_GUIDELINE(item);
129 if (((SPCanvasItemClass *) parent_class)->update) {
130 ((SPCanvasItemClass *) parent_class)->update(item, affine, flags);
131 }
133 if (gl->vertical) {
134 gl->position = (int) (affine[4] + 0.5);
135 sp_canvas_update_bbox (item, gl->position, -1000000, gl->position + 1, 1000000);
136 } else {
137 gl->position = (int) (affine[5] - 0.5);
138 sp_canvas_update_bbox (item, -1000000, gl->position, 1000000, gl->position + 1);
139 }
140 }
142 static double sp_guideline_point(SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item)
143 {
144 SPGuideLine *gl = SP_GUIDELINE (item);
146 if (!gl->sensitive) {
147 return NR_HUGE;
148 }
150 *actual_item = item;
152 if (gl->vertical) {
153 return MAX(fabs(gl->position - p[NR::X])-1, 0);
154 } else {
155 return MAX(fabs(gl->position - p[NR::Y])-1, 0);
156 }
157 }
159 SPCanvasItem *sp_guideline_new(SPCanvasGroup *parent, double position, unsigned int vertical)
160 {
161 SPCanvasItem *item = sp_canvas_item_new(parent, SP_TYPE_GUIDELINE, NULL);
163 SPGuideLine *gl = SP_GUIDELINE(item);
165 gl->vertical = vertical;
166 sp_guideline_set_position(gl, position);
168 return item;
169 }
171 void sp_guideline_set_position(SPGuideLine *gl, double position)
172 {
173 sp_canvas_item_affine_absolute(SP_CANVAS_ITEM (gl),
174 NR::Matrix(NR::translate(position, position)));
175 }
177 void sp_guideline_set_color(SPGuideLine *gl, unsigned int rgba)
178 {
179 gl->rgba = rgba;
181 sp_canvas_item_request_update(SP_CANVAS_ITEM(gl));
182 }
184 void sp_guideline_set_sensitive(SPGuideLine *gl, int sensitive)
185 {
186 gl->sensitive = sensitive;
187 }
189 /*
190 Local Variables:
191 mode:c++
192 c-file-style:"stroustrup"
193 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
194 indent-tabs-mode:nil
195 fill-column:99
196 End:
197 */
198 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :