C语言图形库函数

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1. 初始化图形系统

函数名: initgraph

功能: 初始化图形系统

用法: void far initgraph(int far *graphdriver, int far *graphmode, char far *pathtodriver);

程序例:

#include

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

/* initialize graphics mode */

initgraph(&gdriver, &gmode, "");

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk) /* an error occurred */

{

printf("Graphics error: %s\n", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1); /* return with error code */

}

/* draw a line */

line(0, 0, getmaxx(), getmaxy());

/* clean up */

getch();

closegraph();

return 0;

}

2.

函数名: drawpoly

功能: 画多边形

用法: void far drawpoly(int numpoints, int far *polypoints); 程序例:

#include

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int maxx, maxy;

/* our polygon array */

int poly[10];

/* initialize graphics and local

variables */

initgraph(&gdriver, &gmode, "");

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk)

/* an error occurred */

{

printf("Graphics error: %s\n", \

grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

/* terminate with an error code */

exit(1);

}

maxx = getmaxx();

maxy = getmaxy();

poly[0] = 20; /* 1st vertext */

poly[1] = maxy / 2;

poly[2] = maxx - 20; /* 2nd */

poly[3] = 20;

poly[4] = maxx - 50; /* 3rd */

poly[5] = maxy - 20;

poly[6] = maxx / 2; /* 4th */

poly[7] = maxy / 2;

/*

drawpoly doesn't automatically close

the polygon, so we close it.

*/

poly[8] = poly[0];

poly[9] = poly[1];

/* draw the polygon */

drawpoly(5, poly);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: ellipse

功能: 画一椭圆

用法: void far ellipse(int x, int y, int stangle, int endangle, int xradius, int yradius);

程序例:

#include

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

int stangle = 0, endangle = 360;

int xradius = 100, yradius = 50;

/* initialize graphics, local variables */ initgraph(&gdriver, &gmode, "");

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk)

/* an error occurred */

{

printf("Graphics error: %s\n",

grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1);

/* terminate with an error code */

}

midx = getmaxx() / 2;

midy = getmaxy() / 2;

setcolor(getmaxcolor());

/* draw ellipse */

ellipse(midx, midy, stangle, endangle,

xradius, yradius);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: fillellipse

功能: 画出并填充一椭圆

C语言 图形库函数