mirror of https://github.com/GNOME/gimp.git
275 lines
6.6 KiB
C
275 lines
6.6 KiB
C
/* The GIMP -- an image manipulation program
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*
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* This file Copyright (C) 1999 Simon Budig
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <math.h>
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#include "path_bezier.h"
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#define HANDLE_HALFWIDTH 3
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#define HANDLE_WIDTH 6
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/*
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* This function is to get a set of npoints different coordinates for
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* the range from start to end (each in the range from 0 to 1 and
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* start < end.
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* returns the number of created coords. Make sure that the points-
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* Array is allocated.
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*/
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guint
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path_bezier_get_points (PathTool *path_tool,
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PathSegment *segment,
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GdkPoint *points,
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guint npoints,
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gdouble start,
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gdouble end)
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{
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return 0;
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}
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void
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path_bezier_get_point (PathTool *path_tool,
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PathSegment *segment,
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gdouble pos,
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gdouble *x,
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gdouble *y)
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{
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PathBezierData *data = (PathBezierData *) segment->data;
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if (segment->next) {
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*x = (1-pos) * (1-pos) * (1-pos) * segment->x
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+ 3 * pos * (1-pos) * (1-pos) * (segment->x + data->x1)
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+ 3 * pos * pos * (1-pos) * (segment->next->x + data->x2)
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+ pos * pos * pos * (segment->next->x);
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*y = (1-pos) * (1-pos) * (1-pos) * segment->y
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+ 3 * pos * (1-pos) * (1-pos) * (segment->y + data->y1)
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+ 3 * pos * pos * (1-pos) * (segment->next->y + data->y2)
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+ pos * pos * pos * (segment->next->y);
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}
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#ifdef PATH_TOOL_DEBUG
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else fprintf (stderr, "FIXME: path_bezier_get_point called with endpoint-segment!!!\n");
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#endif
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return;
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}
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void
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path_bezier_draw_handles (Tool *tool,
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PathSegment *segment)
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{
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PathTool *path_tool = (PathTool *) (tool->private);
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PathBezierData *data = (PathBezierData *) segment->data;
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GDisplay * gdisp = tool->gdisp_ptr;
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gint sx, sy, hx, hy;
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if (segment->next) {
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if (segment->flags & SEGMENT_ACTIVE) {
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gdisplay_transform_coords (gdisp,
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(gint) (segment->x), (gint) (segment->y), &sx, &sy, FALSE);
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gdisplay_transform_coords (gdisp,
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(gint) (segment->x + data->x1),
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(gint) (segment->y + data->y1), &hx, &hy, FALSE);
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gdk_draw_line (path_tool->core->win,
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path_tool->core->gc, hx, hy, sx, sy);
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gdk_draw_rectangle (path_tool->core->win, path_tool->core->gc, 0,
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hx - HANDLE_HALFWIDTH, hy - HANDLE_HALFWIDTH,
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HANDLE_WIDTH, HANDLE_WIDTH);
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}
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if (segment->next->flags & SEGMENT_ACTIVE) {
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gdisplay_transform_coords (gdisp,
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(gint) (segment->next->x), (gint) (segment->next->y), &sx, &sy, FALSE);
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gdisplay_transform_coords (gdisp,
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(gint) (segment->next->x + data->x2),
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(gint) (segment->next->y + data->y2), &hx, &hy, FALSE);
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gdk_draw_line (path_tool->core->win,
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path_tool->core->gc, hx, hy, sx, sy);
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gdk_draw_rectangle (path_tool->core->win, path_tool->core->gc, 0,
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hx - HANDLE_HALFWIDTH, hy - HANDLE_HALFWIDTH,
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HANDLE_WIDTH, HANDLE_WIDTH);
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}
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}
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}
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void
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path_bezier_draw_segment (Tool *tool,
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PathSegment *segment)
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{
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return;
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}
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gdouble
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path_bezier_on_segment (Tool *tool,
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PathSegment *segment,
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gint x,
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gint y,
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gint halfwidth,
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gint *distance)
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{
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return -1;
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}
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void
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path_bezier_drag_segment (PathTool *path_tool,
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PathSegment *segment,
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gdouble pos,
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gdouble dx,
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gdouble dy)
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{
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PathBezierData *data = (PathBezierData *) segment->data;
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gdouble feel_good;
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if (pos <= 0.5)
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feel_good = (pow(2 * pos, 3)) / 2;
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else
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feel_good = (1 - pow((1-pos)*2, 3)) / 2 + 0.5;
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data->x1 += (dx / (3*pos*(1-pos)*(1-pos)))*(1-feel_good);
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data->y1 += (dy / (3*pos*(1-pos)*(1-pos)))*(1-feel_good);
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data->x2 += (dx / (3*pos*pos*(1-pos)))*feel_good;
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data->y2 += (dy / (3*pos*pos*(1-pos)))*feel_good;
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return;
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}
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gint
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path_bezier_on_handles (PathTool *path_tool,
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PathSegment *segment,
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gdouble x,
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gdouble y,
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gdouble halfwidth)
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{
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PathBezierData *data = (PathBezierData *) segment->data;
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if (segment->flags & SEGMENT_ACTIVE &&
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fabs(segment->x + data->x1 - x) <= halfwidth &&
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fabs(segment->y + data->y1 - y) <= halfwidth)
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return 1;
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if (segment->next && segment->next->flags & SEGMENT_ACTIVE &&
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fabs(segment->next->x + data->x2 - x) <= halfwidth &&
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fabs(segment->next->y + data->y2 - y) <= halfwidth)
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return 2;
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return 0;
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}
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void
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path_bezier_drag_handles (PathTool *path_tool,
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PathSegment *segment,
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gdouble dx,
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gdouble dy,
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gint handle_id)
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{
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PathBezierData *data = (PathBezierData *) segment->data;
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if (handle_id == 1) {
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data->x1 += dx;
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data->y1 += dy;
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} else {
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data->x2 += dx;
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data->y2 += dy;
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}
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}
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PathSegment *
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path_bezier_insert_anchor (PathTool *path_tool,
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PathSegment *segment,
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gdouble position)
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{
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return NULL;
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}
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void
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path_bezier_update_segment (PathTool *path_tool,
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PathSegment *segment)
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{
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return;
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}
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void
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path_bezier_flip_segment (PathSegment *segment)
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{
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PathBezierData *data = (PathBezierData *) segment->data;
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gdouble swap;
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swap = data->x1;
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data->x1 = data->x2;
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data->x2 = swap;
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swap = data->y1;
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data->y1 = data->y2;
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data->y2 = swap;
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return;
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}
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void
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path_bezier_init_segment (PathSegment *segment)
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{
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PathBezierData *data, *neardata;
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data = g_new(PathBezierData, 1);
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data->x1 = 0;
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data->y1 = 0;
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data->x2 = 0;
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data->y2 = 0;
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if (segment->prev && segment->prev->type == SEGMENT_BEZIER) {
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neardata = (PathBezierData *) segment->prev->data;
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data->x1 = - neardata->x2;
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data->y1 = - neardata->y2;
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}
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if (segment->next && segment->next->type == SEGMENT_BEZIER) {
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neardata = (PathBezierData *) segment->next->data;
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data->x2 = - neardata->x1;
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data->y2 = - neardata->y1;
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}
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#ifdef PATH_TOOL_DEBUG
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if (segment->data)
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fprintf(stderr, "Warning: path_bezier_init_segment called with already initialized segment\n");
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#endif
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segment->data = data;
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return;
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}
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void
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path_bezier_cleanup_segment (PathSegment *segment)
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{
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g_free(segment->data);
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segment->data = NULL;
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return;
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}
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