用c语言写一个医疗波形图
时间: 2023-11-15 13:05:02 浏览: 33
要实现医疗波形图,需要借助一些绘图库,比如cairo、SDL等。以下是一个用cairo绘制心电图的示例代码,仅供参考:
```c
#include <cairo.h>
#include <math.h>
#define WIDTH 800
#define HEIGHT 600
void draw_background(cairo_t* cr) {
cairo_set_source_rgb(cr, 0.2, 0.2, 0.2);
cairo_paint(cr);
}
void draw_grid(cairo_t* cr) {
cairo_set_source_rgb(cr, 0.5, 0.5, 0.5);
cairo_set_line_width(cr, 0.5);
for (int i = 0; i < 10; i++) {
cairo_move_to(cr, 0, i * HEIGHT / 10);
cairo_line_to(cr, WIDTH, i * HEIGHT / 10);
}
for (int i = 0; i < 8; i++) {
cairo_move_to(cr, i * WIDTH / 8, 0);
cairo_line_to(cr, i * WIDTH / 8, HEIGHT);
}
cairo_stroke(cr);
}
void draw_wave(cairo_t* cr) {
cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
cairo_set_line_width(cr, 1.0);
cairo_move_to(cr, 0, HEIGHT / 2);
for (double x = 0; x < WIDTH; x += 0.1) {
double y = sin(x * 0.05) * HEIGHT / 4 + HEIGHT / 2;
cairo_line_to(cr, x, y);
}
cairo_stroke(cr);
}
int main() {
cairo_surface_t* surface;
cairo_t* cr;
surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT);
cr = cairo_create(surface);
draw_background(cr);
draw_grid(cr);
draw_wave(cr);
cairo_surface_write_to_png(surface, "ecg.png");
cairo_destroy(cr);
cairo_surface_destroy(surface);
return 0;
}
```
该代码使用cairo绘制了一个心电图,包括绘制背景、网格和波形等功能。其中,draw_background函数用于绘制背景,draw_grid函数用于绘制网格,draw_wave函数用于绘制波形。具体实现方法可以参考cairo的API文档。最后,将绘制好的图像保存为PNG格式的文件。