cairo绘图png,pdf,svg

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//png五步骤

#include<cairo.h>

#include<png.h>

#define _USE_MATH_DEFINES //此两行为支持M_PI的使用

#include<math.h>

cairo_surface_t * surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 500, 500);//第一步
cairo_t * cr = cairo_create(surface);//第二步

/*
     此处放具体操作
  cairo_arc(cr, 250, 250, 100, 0, 2 * M_PI);
  cairo_set_source_rgb(cr, 1, 0.2, 0.2);
  cairo_fill_preserve(cr);
  cairo_set_source_rgb(cr, 0, 0, 0);
  cairo_set_line_width(cr, 10);
  cairo_stroke(cr);

*/
cairo_surface_write_to_png(surface,"f:/png/exa.png");//第三步
cairo_destroy(cr);//第四步
cairo_surface_destroy(surface);//第五步

//png五步骤

#include<cairo.h>

#include<cairo-pdf.h>

cairo_surface_t * surface = cairo_pdf_surface_create("f:/pdf/exa,pdf",500,500");
cairo_t * cr = cairo_create(surface);

cairo_show_page(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);

//svg五步骤

#include<cairo.h>

#include<cairo-svg.h>

cairo_surface_t * surface = cairo_svg_surface_create("f:/svg/exa.svg", 500, 500);
cairo_t * cr = cairo_create(surface);

cairo_show_page(cr);
cairo_destroy(cr);
cairo_surface_destroy(surface);

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