3_7.c

浙大《C语言设计基础课程设计》中的例程 有些比较好的代码！

/*------例程3-7 -------*/
#include <graphics.h>
main()
{
	int graphdriver=VGA;
	int graphmode=VGAHI;
	int x;
	initgraph(&graphdriver,&graphmode,"");
	cleardevice();
	/*画平行四边形*/
        line(150,100,100,300);
	moveto(100,300);
	lineto(500,300);
	linerel(50,-200);
	lineto(150,100);

       /*画垂直中线，线为淡蓝色粗线*/
       /*自定线型(0x1001)的模式是4个白点后跟8个不显示点，接着4个白点*/
	moverel(200,0);
        setcolor(EGA_LIGHTBLUE);
	setlinestyle(4,0x1001,3);
	lineto(300,300);

       /*画水平中线*/
	for(x=125;x<=519;x+=16)
	{
        /*线的模式是两个连续的淡绿点间隔四个不显示点后，*/
        /*又有两个连续的淡红点后接16个不显示点         */
		putpixel(x,200,EGA_LIGHTGREEN);
                putpixel(x+1,200,EGA_LIGHTGREEN);
		putpixel(x+5,200,EGA_LIGHTRED);
		putpixel(x+6,200,EGA_LIGHTRED);
	}
	getch();
	closegraph();
}
/*------例程3-7结束-------*/