wex12_21.cpp

数据结构C++代码,经典代码,受益多多,希望大家多多支持

#include <iostream.h>
#pragma hdrstop

#include "graphlib.h"
#include "geometry.h"
#include "random.h"

// defines a Circle at (x,y), radius l or a Rectangle at (x,y)
// with length l and width w
struct FigParms
{
	float x;
	float y;
	float l;
	float w;
};

void main(void)
{
	// use array figures to hold the geometric object addresses
	Shape *figures[5];
	// the objects are constructed using data from geomData. a circle
	// is constructed with radius geomData[i].l
	FigParms geomData[5] = {{1,1,.5,1.0}, {2,2,.75,.5}, {2.5,3,.5,1.5},
							{3.2,3.8,.25,.25}, {4.5,5,.3,.8}};
	RandomNumber rnd;
	
	// generate 5 objects randomly
	for(int i=0;i < 5;i++)
		// if rnd.Random(2) is 0, create a circle with parameters
		// specified by geomData[i], fill pattern i
		if (rnd.Random(2) == 0)
			figures[i] = new Circle(geomData[i].x, geomData[i].y,
									geomData[i].l,i);
		else
			// if rnd.Random(2) is 1, create a rectangle with
			// parameters specified by geomData[i], fill pattern i
			figures[i] = new Rectangle(geomData[i].x, geomData[i].y,
									geomData[i].l,geomData[i].w, i);

	cout << "Area and perimeter of the figures:" << endl;
	for(i=0;i < 5;i++)
		cout << figures[i]->Area() << "  " << figures[i]->Perimeter() << endl;
	ViewPause();
		
	// initialize the graphics system and use polymorphism to draw
	// the figures
	InitGraphics();
	for(i=0;i < 5;i++)
		figures[i]->Draw();
	ViewPause();
   ShutdownGraphics();
}

/*
<Run>

Area and perimeter of the figures:
0.785398  3.14159
1.767144  4.712385
0.75  4
0.196349  1.570795
0.24  2.2
*/