#include <string.h>
#include <cairo/cairo.h>
#include <cairo/cairo-svg.h>
#include <cstdlib>

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
int main()
{
	int height = 400;
	int width = 400;
	int stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, width);
	unsigned char *data = (unsigned char *)malloc (height * stride);
	memset(data, 0xff, height * stride);
    cairo_surface_t* surface =
        cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32, width, height, stride);
    cairo_t* cr =
        cairo_create(surface);

    // 绘制，并获取图片名称
    // 调用不同的函数可以绘制不同的图形
    char fileName[] = "./main.png";
    
	double xc = 128.0;
	double yc = 128.0;
	double radius = 100.0;
	double angle1 = 45.0  * (M_PI/180.0);  /* angles are specified */
	double angle2 = 180.0 * (M_PI/180.0);  /* in radians           */

	cairo_set_line_width (cr, 10.0);
	cairo_arc (cr, xc, yc, radius, angle1, angle2);
	cairo_stroke (cr);

	/* draw helping lines */
	cairo_set_source_rgba (cr, 1, 0.2, 0.2, 0.6);
	cairo_set_line_width (cr, 6.0);

	cairo_arc (cr, xc, yc, 10.0, 0, 2*M_PI);
	cairo_fill (cr);

	cairo_arc (cr, xc, yc, radius, angle1, angle1);
	cairo_line_to (cr, xc, yc);
	cairo_arc (cr, xc, yc, radius, angle2, angle2);
	cairo_line_to (cr, xc, yc);
	cairo_stroke (cr);


    // 给图片添加后缀
    // fileName += ".png";
    // 销毁上下文
    cairo_destroy(cr);
    //将绘制的结果写到图片中
    cairo_surface_write_to_png(surface, fileName);
    //销毁画布
    cairo_surface_destroy(surface);
	return 0;
}