我尝试使用开罗绘制一个矩形,其左上角和右下角切角,类似于Qt徽标。
这里是代码:
#include <stdio.h>
#include <stdlib.h>
#include <cairo.h>
int main()
{
double height = 500, width = 250;
cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 500, 500);
cairo_t *cr = cairo_create (surface);
cairo_move_to(cr,0,0);
cairo_line_to(cr,width,0);
cairo_line_to(cr,width,height - height/4);
cairo_line_to(cr,width - height/4,height);
cairo_line_to(cr,0,height);
cairo_set_line_width (cr, 10.0);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_stroke (cr);
cairo_destroy (cr);
cairo_surface_write_to_png (surface, "hello.png");
cairo_surface_destroy (surface);
return 0;
}
我没有得到想要的结果,有人可以给小费吗?无论我采用哪种编程语言。
使用更新后的形状,您只是错过了第一笔画。其余的笔划需要相应地向右移动。
cairo_move_to(cr, 0, height/4);
cairo_line_to(cr, height/4, 0);
cairo_line_to(cr, width + height/4, 0);
cairo_line_to(cr, width + height/4, height - height/4);
cairo_line_to(cr, width, height);
cairo_line_to(cr, height/4,height);