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#define __SP_GUIDELINE_C__
/*
* Infinite horizontal/vertical line
*
* Author:
* Lauris Kaplinski <lauris@kaplinski.com>
*
* Copyright (C) 2000-2002 Lauris Kaplinski
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <libnr/nr-pixops.h>
#include "display-forward.h"
#include "sp-canvas-util.h"
#include "guideline.h"
static void sp_guideline_class_init(SPGuideLineClass *c);
static void sp_guideline_init(SPGuideLine *guideline);
static void sp_guideline_destroy(GtkObject *object);
static void sp_guideline_update(SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags);
static void sp_guideline_render(SPCanvasItem *item, SPCanvasBuf *buf);
static double sp_guideline_point(SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item);
static SPCanvasItemClass *parent_class;
GType sp_guideline_get_type()
{
static GType guideline_type = 0;
if (!guideline_type) {
static const GTypeInfo guideline_info =
{
sizeof (SPGuideLineClass),
NULL, NULL,
(GClassInitFunc) sp_guideline_class_init,
NULL, NULL,
sizeof (SPGuideLine),
16,
(GInstanceInitFunc) sp_guideline_init,
NULL,
};
guideline_type = g_type_register_static(SP_TYPE_CANVAS_ITEM, "SPGuideLine", &guideline_info, (GTypeFlags) 0);
}
return guideline_type;
}
static void sp_guideline_class_init(SPGuideLineClass *c)
{
parent_class = (SPCanvasItemClass*) g_type_class_peek_parent(c);
GtkObjectClass *object_class = (GtkObjectClass *) c;
object_class->destroy = sp_guideline_destroy;
SPCanvasItemClass *item_class = (SPCanvasItemClass *) c;
item_class->update = sp_guideline_update;
item_class->render = sp_guideline_render;
item_class->point = sp_guideline_point;
}
static void sp_guideline_init(SPGuideLine *gl)
{
gl->rgba = 0x0000ff7f;
gl->vertical = 0;
gl->sensitive = 0;
}
static void sp_guideline_destroy(GtkObject *object)
{
GTK_OBJECT_CLASS(parent_class)->destroy(object);
}
static void sp_guideline_render(SPCanvasItem *item, SPCanvasBuf *buf)
{
SPGuideLine const *gl = SP_GUIDELINE (item);
sp_canvas_prepare_buffer(buf);
unsigned int const r = NR_RGBA32_R (gl->rgba);
unsigned int const g = NR_RGBA32_G (gl->rgba);
unsigned int const b = NR_RGBA32_B (gl->rgba);
unsigned int const a = NR_RGBA32_A (gl->rgba);
int p0, p1, step;
unsigned char *d;
if (gl->vertical) {
if (gl->position < buf->rect.x0 || gl->position >= buf->rect.x1) {
return;
}
p0 = buf->rect.y0;
p1 = buf->rect.y1;
step = buf->buf_rowstride;
d = buf->buf + 3 * (gl->position - buf->rect.x0);
} else {
if (gl->position < buf->rect.y0 || gl->position >= buf->rect.y1) {
return;
}
p0 = buf->rect.x0;
p1 = buf->rect.x1;
step = 3;
d = buf->buf + (gl->position - buf->rect.y0) * buf->buf_rowstride;
}
for (int p = p0; p < p1; p++) {
d[0] = NR_COMPOSEN11(r, a, d[0]);
d[1] = NR_COMPOSEN11(g, a, d[1]);
d[2] = NR_COMPOSEN11(b, a, d[2]);
d += step;
}
}
static void sp_guideline_update(SPCanvasItem *item, NR::Matrix const &affine, unsigned int flags)
{
SPGuideLine *gl = SP_GUIDELINE(item);
if (((SPCanvasItemClass *) parent_class)->update) {
((SPCanvasItemClass *) parent_class)->update(item, affine, flags);
}
if (gl->vertical) {
gl->position = (int) (affine[4] + 0.5);
sp_canvas_update_bbox (item, gl->position, -1000000, gl->position + 1, 1000000);
} else {
gl->position = (int) (affine[5] - 0.5);
sp_canvas_update_bbox (item, -1000000, gl->position, 1000000, gl->position + 1);
}
}
static double sp_guideline_point(SPCanvasItem *item, NR::Point p, SPCanvasItem **actual_item)
{
SPGuideLine *gl = SP_GUIDELINE (item);
if (!gl->sensitive) {
return NR_HUGE;
}
*actual_item = item;
if (gl->vertical) {
return MAX(fabs(gl->position - p[NR::X])-1, 0);
} else {
return MAX(fabs(gl->position - p[NR::Y])-1, 0);
}
}
SPCanvasItem *sp_guideline_new(SPCanvasGroup *parent, double position, unsigned int vertical)
{
SPCanvasItem *item = sp_canvas_item_new(parent, SP_TYPE_GUIDELINE, NULL);
SPGuideLine *gl = SP_GUIDELINE(item);
gl->vertical = vertical;
sp_guideline_set_position(gl, position);
return item;
}
void sp_guideline_set_position(SPGuideLine *gl, double position)
{
sp_canvas_item_affine_absolute(SP_CANVAS_ITEM (gl),
NR::Matrix(NR::translate(position, position)));
}
void sp_guideline_set_color(SPGuideLine *gl, unsigned int rgba)
{
gl->rgba = rgba;
sp_canvas_item_request_update(SP_CANVAS_ITEM(gl));
}
void sp_guideline_set_sensitive(SPGuideLine *gl, int sensitive)
{
gl->sensitive = sensitive;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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