c++ 直线裁剪、画矩形等示例源码（graphics）

【实例截图】

【核心代码】

#include <stdio.h>

#include <graphics.h>

typedef struct{

int x;

int y;

}pt2;

/*declare your drawing functions.*/

void drawline(pt2 startpt, pt2 endpt, int color);

void drawcircle(pt2 centerpt, int radius, int color);

int main()

{

int color, radius;

pt2 startpt, endpt, centerpt;

/*initialize graphics driver.*/

int gdriver=VGA;

int gmode=VGAHI;

initgraph(&gdriver, &gmode, "C:\\TC20\\BGI");

/*start drawing.*/

printf("Press enter to start drawing.");

getchar();

/*invoke your drawing functions one by one.*/

startpt.x=10;

startpt.y=10;

endpt.x=300;

endpt.y=250;

color=4;

drawline(startpt, endpt, color);

centerpt.x=200;

centerpt.y=180;

radius=145;

color=8;

drawcircle(centerpt, radius, color);

/*end drawing.*/

printf("Drawing is done, press enter to exit.");

getchar();

/*close graphics driver.*/

closegraph();

}

/*

* draw line

* startpt: the start point of the line

* endpt: the end point of the line

* color: the color of the line

*/

void drawline(pt2 startpt, pt2 endpt, int color)

{

}

/*

* draw circle

* centerpt: the center of the circle

* radius: the radius of the circle

* color: the color of the circle

*/

void drawcircle(pt2 centerpt, int radius, int color)

{

}