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hatchbrush.c
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hatchbrush.c
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/*
* hatchbrush.c
*
* Copyright (C) 2004 Novell, Inc. http://www.novell.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Ravindra (rkumar@novell.com)
*
*/
#include <math.h>
#include "gdip.h"
#include "hatchbrush.h"
static GpStatus gdip_hatch_setup (GpGraphics *graphics, GpBrush *brush);
static GpStatus gdip_hatch_clone (GpBrush *brush, GpBrush **clonedBrush);
static GpStatus gdip_hatch_destroy (GpBrush *brush);
/*
* We keep a single copy of vtable for
* all instances of hatchbrush.
*/
static BrushClass vtable = { BrushTypeHatchFill,
gdip_hatch_setup,
gdip_hatch_clone,
gdip_hatch_destroy };
void
gdip_hatch_init (GpHatch *hatch)
{
gdip_brush_init (&hatch->base, &vtable);
hatch->backColor = 0;
}
GpHatch*
gdip_hatch_new (void)
{
GpHatch *result = (GpHatch *) GdipAlloc (sizeof (GpHatch));
if (result)
gdip_hatch_init (result);
return result;
}
/*
* functions to draw different hatch styles.
*/
#define HATCH_SIZE 7
#define LINE_WIDTH 1
GpStatus
draw_horizontal_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format, GpHatchStyle hatchStyle)
{
cairo_surface_t *hatch;
double hatch_size = HATCH_SIZE;
double line_width = LINE_WIDTH;
/*
* The values used below are obtained by using hit and trial to get
* the results similar to that of MS. Not sure, if the results will
* be the same with different resolutions.
*/
if (hatchStyle == HatchStyleLightHorizontal)
hatch_size *= 0.7; /* As per the docs lines should be 50% closer than */
/* horizontal i.e. multiplication factor of 0.5 */
else if (hatchStyle == HatchStyleNarrowHorizontal) {
hatch_size *= 0.5; /* As per the docs lines should be 75% closer than */
/* horizontal i.e. multiplication factor of 0.25 */
line_width *= 1.5; /* docs say nothing about line width */
}
else if (hatchStyle == HatchStyleDarkHorizontal) {
hatch_size *= 0.6; /* As per the docs lines should be 50% closer than */
/* horizontal i.e. multiplication factor of 0.5 */
line_width *= 2.0; /* As per the docs line width should be twice the */
/* width of horizontal i.e. multiplication factor */
/* of 2.0 */
}
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw horizontal line in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
cairo_move_to (ct, 0, hatch_size / 2.0);
cairo_line_to (ct, hatch_size, hatch_size / 2.0);
cairo_stroke (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_veritcal_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format, GpHatchStyle hatchStyle)
{
cairo_surface_t *hatch;
double hatch_size = HATCH_SIZE;
double line_width = LINE_WIDTH;
/*
* The values used below are obtained by hit and trial to get the
* results similar to that of MS.
*/
if (hatchStyle == HatchStyleLightVertical)
hatch_size *= 0.7; /* As per the docs lines should be 50% closer than */
/* vertical i.e. multiplication factor of 0.5 */
else if (hatchStyle == HatchStyleNarrowVertical) {
hatch_size *= 0.5; /* As per the docs lines should be 75% closer than */
/* vertical i.e. multiplication factor of 0.25 */
line_width *= 1.5; /* docs say nothing about line width */
}
else if (hatchStyle == HatchStyleDarkVertical) {
hatch_size *= 0.6; /* As per the docs lines should be 50% closer than */
/* vertical i.e. multiplication factor of 0.5 */
line_width *= 2.0; /* As per the docs line width should be twice the */
/* width of vertical i.e. multiplication factor of */
/* 2.0 */
}
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw vertical line in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
cairo_move_to (ct, hatch_size / 2.0, 0);
cairo_line_to (ct, hatch_size / 2.0, hatch_size);
cairo_stroke (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_forward_diagonal_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_size = HATCH_SIZE + 1;
double line_width = LINE_WIDTH;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw forward diagonal lines in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
cairo_move_to (ct, 0, hatch_size / 2.0);
cairo_line_to (ct, hatch_size / 2.0, hatch_size);
cairo_move_to (ct, hatch_size / 2.0, 0);
cairo_line_to (ct, hatch_size, hatch_size / 2.0);
cairo_stroke (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_backward_diagonal_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_size = HATCH_SIZE + 1;
double line_width = LINE_WIDTH;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw backward diagonal lines in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
cairo_move_to (ct, hatch_size / 2.0, 0);
cairo_line_to (ct, 0, hatch_size / 2.0);
cairo_move_to (ct, hatch_size, hatch_size / 2.0);
cairo_line_to (ct, hatch_size / 2.0, hatch_size);
cairo_stroke (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_cross_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format, GpHatchStyle hatchStyle)
{
cairo_surface_t *hatch;
double hatch_size = HATCH_SIZE + 2;
double line_width = LINE_WIDTH;
double dash [] = {1.0}; /* used for drawing dotted grid */
if (hatchStyle == HatchStyleSmallGrid)
hatch_size *= 0.6; /* small grid are placed 50% closer than cross */
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw lines in the foregound */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
if (hatchStyle == HatchStyleDottedGrid)
cairo_set_dash (ct, dash, 1, 0);
/* draw a horizontal line */
cairo_move_to (ct, 0, hatch_size / 2.0);
cairo_line_to (ct, hatch_size, hatch_size / 2.0);
/* draw a vertical line */
cairo_move_to (ct, hatch_size / 2.0, 0);
cairo_line_to (ct, hatch_size / 2.0, hatch_size);
cairo_stroke (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_diagonal_cross_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format, GpHatchStyle hatchStyle)
{
cairo_surface_t *hatch;
double hatch_size = HATCH_SIZE + 1;
double line_width = LINE_WIDTH;
double dash [] = {1.0}; /* used for drawing dotted diamond */
/* FIXME:
* Lines drawn in case of OutlinedDiamond hatch style are not supposed
* to be antialiased as per MS docs. That is the only difference between
* DiagonalCross and OutlinedDiamond style. Find a way to stop Cairo
* antialiasing to conform to MS docs.
*/
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw diagonal lines in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
if (hatchStyle == HatchStyleDottedDiamond)
cairo_set_dash (ct, dash, 1, 0);
/* draw a forward diagonal line */
cairo_move_to (ct, 0, 0);
cairo_line_to (ct, hatch_size, hatch_size);
/* draw a backward diagonal line */
cairo_move_to (ct, hatch_size, 0);
cairo_line_to (ct, 0, hatch_size);
cairo_stroke (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_05_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_size = HATCH_SIZE + 2;
double rad;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
/* calculate radius using, pi * square (r) = % of hatch area */
rad = sqrt ((5.0 * hatch_size * hatch_size) / (2 * PI * 100.0));
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw four half circles in the foreground to make dots */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
/* left middle */
cairo_arc (ct, 0, hatch_size / 2.0, rad, - PI / 2.0, PI / 2.0);
cairo_fill (ct);
/* top middle */
cairo_arc (ct, hatch_size / 2.0, 0, rad, 0, PI);
cairo_fill (ct);
/* bottom middle */
cairo_arc (ct, hatch_size / 2.0, hatch_size, rad, - PI, 0);
cairo_fill (ct);
/* right middle */
cairo_arc (ct, hatch_size, hatch_size / 2.0, rad, PI / 2.0, - PI / 2.0);
cairo_fill (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_10_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_wd = HATCH_SIZE + 2;
double hatch_ht = 5.0;
double rad;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_wd, hatch_ht);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
/* calculate radius using, pi * square (r) = % of hatch area */
rad = sqrt ((10.0 * hatch_wd * hatch_ht) / (2 * PI * 100.0));
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_wd, hatch_ht);
cairo_fill (ct);
/* draw four half circles in the foreground to make dots */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
/* left middle */
cairo_arc (ct, 0, hatch_ht / 2.0, rad, - PI / 2.0, PI / 2.0);
cairo_fill (ct);
/* top middle */
cairo_arc (ct, hatch_wd / 2.0, 0, rad, 0, PI);
cairo_fill (ct);
/* bottom middle */
cairo_arc (ct, hatch_wd / 2.0, hatch_ht, rad, - PI, 0);
cairo_fill (ct);
/* right middle */
cairo_arc (ct, hatch_wd, hatch_ht / 2.0, rad, PI / 2.0, - PI / 2.0);
cairo_fill (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_20_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_size = 5;
double rad = 0.5;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
/* calculate radius using, pi * square (r) = % of hatch area */
rad = sqrt ((20.0 * hatch_size * hatch_size) / (2 * PI * 100.0));
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw four half circles in the foreground to make dots */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
/* left middle */
cairo_arc (ct, 0, hatch_size / 2.0, rad, - PI / 2.0, PI / 2.0);
cairo_fill (ct);
/* top middle */
cairo_arc (ct, hatch_size / 2.0, 0, rad, 0, PI);
cairo_fill (ct);
/* bottom middle */
cairo_arc (ct, hatch_size / 2.0, hatch_size, rad, - PI, 0);
cairo_fill (ct);
/* right middle */
cairo_arc (ct, hatch_size, hatch_size / 2.0, rad, PI / 2.0, - PI / 2.0);
cairo_fill (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_25_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_wd = 5;
double hatch_ht = 3;
double rad;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_wd, hatch_ht);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
/* calculate radius using, pi * square (r) = % of hatch area */
rad = sqrt ((25.0 * hatch_wd * hatch_ht) / (2 * PI * 100.0));
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_wd, hatch_ht);
cairo_fill (ct);
/* draw four semi circles in the foreground to make dots */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
/* left middle */
cairo_arc (ct, 0, hatch_ht / 2.0, rad, - PI / 2.0, PI / 2.0);
cairo_fill (ct);
/* top middle */
cairo_arc (ct, hatch_wd / 2.0, 0, rad, 0, PI);
cairo_fill (ct);
/* bottom middle */
cairo_arc (ct, hatch_wd / 2.0, hatch_ht, rad, - PI, 0);
cairo_fill (ct);
/* right middle */
cairo_arc (ct, hatch_wd, hatch_ht / 2.0, rad, PI / 2.0, - PI / 2.0);
cairo_fill (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_40_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch, *temp;
double temp_size = 2;
double hatch_wd = HATCH_SIZE + 1;
double hatch_ht = HATCH_SIZE + 1;
double rad;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_wd, hatch_ht);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
/* calculate radius using, pi * square (r) = % of hatch area */
rad = sqrt ((10.0 * hatch_wd * hatch_ht) / (2 * PI * 100.0));
cairo_surface_set_repeat (hatch, 1);
/* draw a 10% hatch */
{
cairo_save (ct);
temp = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, temp_size, temp_size);
if (temp == NULL) {
cairo_surface_destroy (hatch);
return OutOfMemory;
}
cairo_surface_set_repeat (temp, 1);
int Rb = (backcolor & 0x00FF0000) >> 16;
int Gb = (backcolor & 0x0000FF00) >> 8;
int Bb = (backcolor & 0x000000FF);
/* draw a 50% hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, temp);
/* draw background */
cairo_set_rgb_color (ct, (double) Rb / 255.0, (double) Gb / 255.0, (double) Bb / 255.0);
cairo_rectangle (ct, 0, 0, temp_size, temp_size);
cairo_fill (ct);
/* draw two diagonal lines in the foreground */
int R = (forecolor & 0x00FF0000) >> 16;
int G = (forecolor & 0x0000FF00) >> 8;
int B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, temp_size / 2.0, temp_size / 2.0);
cairo_rectangle (ct, temp_size / 2.0, temp_size / 2.0, temp_size, temp_size);
cairo_fill (ct);
cairo_restore (ct);
} /* 50% hatch*/
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, temp);
cairo_surface_destroy (temp);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
/* temp hatch is used as background, so we get 50% hatch */
cairo_set_target_surface (ct, hatch);
cairo_rectangle (ct, 0, 0, hatch_wd, hatch_ht);
cairo_fill (ct);
/* foreground is filled with 10% hatch of background color */
cairo_set_rgb_color (ct, (double) Rb / 255.0, (double) Gb / 255.0, (double) Bb / 255.0);
/* 0.5 is added for pixel adjustment. It's ugly but it makes output better. */
/* draw four semi circles in the foregound to make dots */
/* left middle */
cairo_arc (ct, 0, hatch_ht / 2.0 + 0.5, rad, - PI / 2.0, PI / 2.0);
cairo_fill (ct);
/* top middle */
cairo_arc (ct, hatch_wd / 2.0 + 0.5, 0, rad, 0, PI);
cairo_fill (ct);
/* bottom middle */
cairo_arc (ct, hatch_wd / 2.0 + 0.5, hatch_ht, rad, - PI, 0);
cairo_fill (ct);
/* right middle */
cairo_arc (ct, hatch_wd, hatch_ht / 2.0 + 0.5, rad, PI / 2.0, - PI / 2.0);
cairo_fill (ct);
cairo_restore (ct);
} /* 10% hatch */
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_50_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_size = 2;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_size, hatch_size);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size, hatch_size);
cairo_fill (ct);
/* draw two rectangles in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_size / 2.0, hatch_size / 2.0);
cairo_rectangle (ct, hatch_size / 2.0, hatch_size / 2.0, hatch_size, hatch_size);
cairo_fill (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_60_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_wd = 4;
double hatch_ht = 4;
double line_width = LINE_WIDTH;
int temp;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_wd, hatch_ht);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
/* we need to swap the colors */
temp = forecolor;
forecolor = backcolor;
backcolor = temp;
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_wd, hatch_ht);
cairo_fill (ct);
/* draw two diagonal lines in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
cairo_move_to (ct, hatch_wd, 0);
cairo_line_to (ct, 0, hatch_ht);
cairo_move_to (ct, 0, hatch_ht / 4.0);
cairo_line_to (ct, hatch_wd - hatch_wd / 4.0, hatch_ht);
cairo_stroke (ct);
cairo_restore (ct);
}
/* set the pattern for the consequent fill or stroke */
gdip_cairo_set_surface_pattern (ct, hatch);
cairo_surface_destroy (hatch);
return Ok;
}
GpStatus
draw_70_percent_hatch (cairo_t *ct, int forecolor, int backcolor, cairo_format_t format)
{
cairo_surface_t *hatch;
double hatch_wd = 4;
double hatch_ht = 4;
double line_width = LINE_WIDTH;
hatch = cairo_surface_create_similar (cairo_current_target_surface (ct),
format, hatch_wd, hatch_ht);
g_return_val_if_fail (hatch != NULL, OutOfMemory);
cairo_surface_set_repeat (hatch, 1);
/* draw one hatch */
{
cairo_save (ct);
/* hatch is not supposed to be affected by user matrix */
cairo_identity_matrix (ct);
cairo_set_target_surface (ct, hatch);
/* draw background */
int R = (backcolor & 0x00FF0000) >> 16;
int G = (backcolor & 0x0000FF00) >> 8;
int B = (backcolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_rectangle (ct, 0, 0, hatch_wd, hatch_ht);
cairo_fill (ct);
/* draw two diagonal lines in the foreground */
R = (forecolor & 0x00FF0000) >> 16;
G = (forecolor & 0x0000FF00) >> 8;
B = (forecolor & 0x000000FF);
cairo_set_rgb_color (ct, (double) R / 255.0, (double) G / 255.0, (double) B / 255.0);
cairo_set_line_width (ct, line_width);
/* near top left corner */
cairo_move_to (ct, 0, 0);
cairo_line_to (ct, hatch_wd, hatch_ht);
/* near top right corner */
cairo_move_to (ct, hatch_wd, 0);
cairo_line_to (ct, 0, hatch_ht);
cairo_stroke (ct);
cairo_restore (ct);
}