#include "StdAfx.h"
#include "special.h"

// code for the three shapes of Figure 1
int specialDraw(POINT *vp, int buf_size, int *np, char *cp)
{
	if(buf_size < 11) return 0;
#ifdef USE_CONV_FUNCTIONS
	int k = 0;
	initialize(vp, np, cp);
	
	POINT z[4] = { 100, 100, 200, 200};
	k += path(z, 2, ELLIPSE_SH);
	
	z[0].x += 300;	z[1].x += 310;
	k += path(z, 2, ELLIPSE_SH);
	
	POINT za[4] = {250, 100, 350, 200, 295, 100, 305, 100};
	k += path(za, 4, ARC_SH);
	
	POINT zb[3] = {295, 100, 300, 120, 305, 100};
	k += path(zb, 3, POLYLINE_SH);
	return k;
#else
	vp[0].x = 100;	vp[0].y = 100;
	vp[1].x = 200;	vp[1].y = 200;	np[0] = 2;	cp[0] = 'e';

	vp[2].x = 400;	vp[2].y = 100;
	vp[3].x = 510;	vp[3].y = 200;	np[1] = 2;	cp[1] = 'e';

	vp[4].x = 250;	vp[4].y = 100;
	vp[5].x = 350;	vp[5].y = 200;
	vp[6].x = 295;	vp[6].y = 100;
	vp[7].x = 305;	vp[7].y = 100;	np[2] = 4;	cp[2] = 'a';

	vp[8].x = 295;	vp[8].y = 100;
	vp[9].x = 300;	vp[9].y = 120;
	vp[10].x = 305;	vp[10].y = 100;	np[3] = 3;	cp[3] = 'p';

	return 4;
#endif
}

The shapes are described in the way that matches the way Windows functions draw each shape. The array np contains the number of points for each shape and the array cp contains a character specifying, in effect, the Windows function to be used for drawing. If pDC is a pointer to a device context, the above example will result to the ultimate (from inside PED) call of the functions given below to draw the shapes of Figure 1.

pDC->Ellipse(vp[0].x, vp[0].y, vp[1].x, vp[1].y);
pDC->Ellipse(vp[2].x, vp[2].y, vp[3].x, vp[3].y);
pDC->Arc(vp[4].x, vp[4].y, vp[5].x, vp[5].y, vp[6].x, vp[6].y, vp[7].x, vp[7].y);
pDC->Polyline(&(vp[8]), np[3]);