1 #define __SP_GUIDELINE_C__
3 /*
4 * Horizontal/vertical but can also be angled line
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * Johan Engelen
9 *
10 * Copyright (C) 2000-2002 Lauris Kaplinski
11 * Copyright (C) 2007 Johan Engelen
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
17 #include <libnr/nr-pixops.h>
18 #include "display-forward.h"
19 #include "sp-canvas-util.h"
20 #include "guideline.h"
22 static void sp_guideline_class_init(SPGuideLineClass *c);
23 static void sp_guideline_init(SPGuideLine *guideline);
24 static void sp_guideline_destroy(GtkObject *object);
26 static void sp_guideline_update(SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags);
27 static void sp_guideline_render(SPCanvasItem *item, SPCanvasBuf *buf);
29 static double sp_guideline_point(SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item);
31 static SPCanvasItemClass *parent_class;
33 GType sp_guideline_get_type()
34 {
35 static GType guideline_type = 0;
37 if (!guideline_type) {
38 static GTypeInfo const guideline_info = {
39 sizeof (SPGuideLineClass),
40 NULL, NULL,
41 (GClassInitFunc) sp_guideline_class_init,
42 NULL, NULL,
43 sizeof (SPGuideLine),
44 16,
45 (GInstanceInitFunc) sp_guideline_init,
46 NULL,
47 };
49 guideline_type = g_type_register_static(SP_TYPE_CANVAS_ITEM, "SPGuideLine", &guideline_info, (GTypeFlags) 0);
50 }
52 return guideline_type;
53 }
55 static void sp_guideline_class_init(SPGuideLineClass *c)
56 {
57 parent_class = (SPCanvasItemClass*) g_type_class_peek_parent(c);
59 GtkObjectClass *object_class = (GtkObjectClass *) c;
60 object_class->destroy = sp_guideline_destroy;
62 SPCanvasItemClass *item_class = (SPCanvasItemClass *) c;
63 item_class->update = sp_guideline_update;
64 item_class->render = sp_guideline_render;
65 item_class->point = sp_guideline_point;
66 }
68 static void sp_guideline_init(SPGuideLine *gl)
69 {
70 gl->rgba = 0x0000ff7f;
72 gl->normal = Geom::Point(0,1);
73 gl->sensitive = 0;
74 }
76 static void sp_guideline_destroy(GtkObject *object)
77 {
78 GTK_OBJECT_CLASS(parent_class)->destroy(object);
79 }
81 static void sp_guideline_render(SPCanvasItem *item, SPCanvasBuf *buf)
82 {
83 SPGuideLine const *gl = SP_GUIDELINE (item);
85 sp_canvas_prepare_buffer(buf);
87 unsigned int const r = NR_RGBA32_R (gl->rgba);
88 unsigned int const g = NR_RGBA32_G (gl->rgba);
89 unsigned int const b = NR_RGBA32_B (gl->rgba);
90 unsigned int const a = NR_RGBA32_A (gl->rgba);
92 if (gl->normal[Geom::Y] == 0.) {
93 if (gl->position < buf->rect.x0 || gl->position >= buf->rect.x1) {
94 return;
95 }
97 int p0 = buf->rect.y0;
98 int p1 = buf->rect.y1;
99 int step = buf->buf_rowstride;
100 unsigned char *d = buf->buf + 3 * (gl->position - buf->rect.x0);
102 for (int p = p0; p < p1; p++) {
103 d[0] = NR_COMPOSEN11_1111(r, a, d[0]);
104 d[1] = NR_COMPOSEN11_1111(g, a, d[1]);
105 d[2] = NR_COMPOSEN11_1111(b, a, d[2]);
106 d += step;
107 }
108 } else if (gl->normal[Geom::X] == 0.) {
109 if (gl->position < buf->rect.y0 || gl->position >= buf->rect.y1) {
110 return;
111 }
113 int p0 = buf->rect.x0;
114 int p1 = buf->rect.x1;
115 int step = 3;
116 unsigned char *d = buf->buf + (gl->position - buf->rect.y0) * buf->buf_rowstride;
118 for (int p = p0; p < p1; p++) {
119 d[0] = NR_COMPOSEN11_1111(r, a, d[0]);
120 d[1] = NR_COMPOSEN11_1111(g, a, d[1]);
121 d[2] = NR_COMPOSEN11_1111(b, a, d[2]);
122 d += step;
123 }
124 } else {
125 // render angled line
126 }
127 }
129 static void sp_guideline_update(SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags)
130 {
131 SPGuideLine *gl = SP_GUIDELINE(item);
133 if (((SPCanvasItemClass *) parent_class)->update) {
134 ((SPCanvasItemClass *) parent_class)->update(item, affine, flags);
135 }
137 if (gl->normal[Geom::Y] == 0.) {
138 gl->position = (int) (affine[4] + 0.5);
139 sp_canvas_update_bbox (item, gl->position, -1000000, gl->position + 1, 1000000);
140 } else {
141 gl->position = (int) (affine[5] - 0.5);
142 sp_canvas_update_bbox (item, -1000000, gl->position, 1000000, gl->position + 1);
143 }
144 }
146 static double sp_guideline_point(SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item)
147 {
148 SPGuideLine *gl = SP_GUIDELINE (item);
150 if (!gl->sensitive) {
151 return NR_HUGE;
152 }
154 *actual_item = item;
156 if (gl->normal[Geom::Y] == 0.) {
157 return MAX(fabs(gl->position - p[NR::X])-1, 0);
158 } else {
159 return MAX(fabs(gl->position - p[NR::Y])-1, 0);
160 }
161 }
163 SPCanvasItem *sp_guideline_new(SPCanvasGroup *parent, double position, Geom::Point normal)
164 {
165 SPCanvasItem *item = sp_canvas_item_new(parent, SP_TYPE_GUIDELINE, NULL);
167 SPGuideLine *gl = SP_GUIDELINE(item);
169 normal.normalize();
170 gl->normal = normal;
171 sp_guideline_set_position(gl, position);
173 return item;
174 }
176 void sp_guideline_set_position(SPGuideLine *gl, double position)
177 {
178 sp_canvas_item_affine_absolute(SP_CANVAS_ITEM (gl),
179 NR::Matrix(NR::translate(position, position)));
180 }
182 void sp_guideline_set_color(SPGuideLine *gl, unsigned int rgba)
183 {
184 gl->rgba = rgba;
186 sp_canvas_item_request_update(SP_CANVAS_ITEM(gl));
187 }
189 void sp_guideline_set_sensitive(SPGuideLine *gl, int sensitive)
190 {
191 gl->sensitive = sensitive;
192 }
195 /*
196 Local Variables:
197 mode:c++
198 c-file-style:"stroustrup"
199 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
200 indent-tabs-mode:nil
201 fill-column:99
202 End:
203 */
204 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :