gimp/app/pencil.c

213 lines
5.2 KiB
C

/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdlib.h>
#include "appenv.h"
#include "drawable.h"
#include "errors.h"
#include "gdisplay.h"
#include "gimpbrushpixmap.h"
#include "paint_funcs.h"
#include "paint_core.h"
#include "paint_options.h"
#include "paintbrush.h"
#include "palette.h"
#include "pencil.h"
/* for color_area_with_pixmap */
#include "pixmapbrush.h"
#include "selection.h"
#include "tools.h"
#include "libgimp/gimpintl.h"
/* the pencil tool options */
static PaintOptions *pencil_options = NULL;
/* forward function declarations */
static void pencil_motion (PaintCore *, GimpDrawable *, gboolean);
static gboolean non_gui_incremental = FALSE;
#define PENCIL_INCREMENTAL_DEFAULT FALSE
/* functions */
void *
pencil_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
switch (state)
{
case INIT_PAINT :
break;
case MOTION_PAINT :
pencil_motion (paint_core, drawable, pencil_options->incremental);
break;
case FINISH_PAINT :
break;
default :
break;
}
return NULL;
}
void
pencil_options_reset (void)
{
paint_options_reset (pencil_options);
}
Tool *
tools_new_pencil (void)
{
Tool * tool;
PaintCore * private;
/* The tool options */
if (!pencil_options)
{
pencil_options = paint_options_new (PENCIL, pencil_options_reset);
tools_register (PENCIL, (ToolOptions *) pencil_options);
}
tool = paint_core_new (PENCIL);
private = (PaintCore *) tool->private;
private->paint_func = pencil_paint_func;
private->pick_colors = TRUE;
return tool;
}
void
tools_free_pencil (Tool *tool)
{
paint_core_free (tool);
}
static void
pencil_motion (PaintCore *paint_core,
GimpDrawable *drawable,
gboolean increment)
{
GImage *gimage;
TempBuf * area;
unsigned char col[MAX_CHANNELS];
gint opacity;
PaintApplicationMode paint_appl_mode = increment ? INCREMENTAL : CONSTANT;
if (! (gimage = drawable_gimage (drawable)))
return;
gimage_get_foreground (gimage, drawable, col);
/* Get a region which can be used to paint to */
if (! (area = paint_core_get_paint_area (paint_core, drawable)))
return;
/* set the alpha channel */
col[area->bytes - 1] = OPAQUE_OPACITY;
if (GIMP_IS_BRUSH_PIXMAP (paint_core->brush))
{
/* if its a pixmap, do pixmap stuff */
color_area_with_pixmap (gimage, drawable, area, paint_core->brush);
paint_appl_mode = INCREMENTAL;
}
else
{
/* color the pixels */
color_pixels (temp_buf_data (area), col,
area->width * area->height, area->bytes);
}
/*Make the opacity dependent on the current pressure
This makes a more natural pencil since light pressure
on a graphite pen will give transparent line */
opacity = 255 * gimp_context_get_opacity (NULL) * (paint_core->curpressure / 0.5);
if (opacity > 255)
opacity = 255;
/* paste the newly painted canvas to the gimage which is being worked on */
paint_core_paste_canvas (paint_core, drawable, opacity,
(int) (gimp_context_get_opacity (NULL) * 255),
gimp_context_get_paint_mode (NULL),
HARD, paint_appl_mode);
}
static void *
pencil_non_gui_paint_func (PaintCore *paint_core,
GimpDrawable *drawable,
int state)
{
pencil_motion (paint_core, drawable, non_gui_incremental);
return NULL;
}
gboolean
pencil_non_gui (GimpDrawable *drawable,
int num_strokes,
double *stroke_array)
{
int i;
if (paint_core_init (&non_gui_paint_core, drawable,
stroke_array[0], stroke_array[1]))
{
/* Set the paint core's paint func */
non_gui_paint_core.paint_func = pencil_non_gui_paint_func;
non_gui_paint_core.startx = non_gui_paint_core.lastx = stroke_array[0];
non_gui_paint_core.starty = non_gui_paint_core.lasty = stroke_array[1];
pencil_non_gui_paint_func (&non_gui_paint_core, drawable, 0);
for (i = 1; i < num_strokes; i++)
{
non_gui_paint_core.curx = stroke_array[i * 2 + 0];
non_gui_paint_core.cury = stroke_array[i * 2 + 1];
paint_core_interpolate (&non_gui_paint_core, drawable);
non_gui_paint_core.lastx = non_gui_paint_core.curx;
non_gui_paint_core.lasty = non_gui_paint_core.cury;
}
/* Finish the painting */
paint_core_finish (&non_gui_paint_core, drawable, -1);
/* Cleanup */
paint_core_cleanup ();
return TRUE;
}
else
return FALSE;
}