Kontron KTAM3874-pITX - Manual (Page 156)

KTD-S0057-I Page 152 Linux® Programming Examples (DebianTM)
KTAM3874/pITX Software Guide
/***************************************************************
* Cairo PDF demonstration program
* 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.
****************************************************************/
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <cairo/cairo-pdf.h>
/* #include <cairo/cairo-ps.h>
#include <cairo/cairo-svg.h> */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#define WIDTH 595
#define HEIGHT 842
#define OBJ1_COL1 "black"
#define OBJ1_COL2 "sienna"
#define OBJ2_COL1 "red"
#define OBJ2_COL2 "blue"
#define OBJ2_XOFFS 300
#define OBJ2_YOFFS 0
#define NUM_TEXT
20
#define TEXT_WIDTH 250.0
#define TEXT_HEIGHT 250.0
#define TEXT_SIZE 20.0
#define RGB_R(c) ((double)((c>>16)&255)/255.0)
#define RGB_G(c) ((double)((c>>8)&255)/255.0)
#define RGB_B(c) ((double)(c&255)/255.0)
#define C(c) (c.pixel)
typedef struct {
Display
*disp;
Colormap cmap;
} XSystem;
static void draw_quadrant (XSystem sys, cairo_t *cr, const char *text, const cairo_text_extents_t *extents,
const cairo_matrix_t *transform, int x_off, int y_off)
{
XColor
col;
int i;
for (i = 0; i < NUM_TEXT / 4; i++)
{
cairo_save (cr);
cairo_rotate (cr, 2.0 * M_PI * (double) i / (double) NUM_TEXT);
cairo_transform (cr, transform);
cairo_set_line_width (cr, 1.0);
cairo_rectangle (cr, (double) x_off - 0.5, (double) y_off - 0.5, extents->width + 1.0, extents->height + 1.0);