Code:
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <time.h>
#include "C:\Dev-C++\Graphics\winbgim.h"
using namespace std;
// Draw Shape class
class DrawShape
{
private:
int colour;
static int count;
public:
static int getCount() { return count; }
int getColour() { return colour; }
DrawShape() {};
DrawShape(int c) // All Shapes have a colour
{
colour = c;
count++; // Increment the count
}
~DrawShape() // Decrement count
{
count--;
}
// All shapes require a Label.
// best to implement the label method in the base class.
// Note the call to Area. This calls the Area function in the
// actual shape object that has been instantiated.
void label (int x, int y)
{
char s[20];
sprintf (s, "%d", (int)Area());
setcolor(WHITE);
setbkcolor(BLACK);
settextjustify(CENTER_TEXT, CENTER_TEXT);
outtextxy(x, y, s);
}
// virtual functions - MUST be implemented in derived classes
virtual double Area() = 0;
virtual void Draw() = 0;
};
class Circle:DrawShape {
private:
int xpos, ypos, radius;
public:
Circle(int);
virtual double Area() {
return 3.14*radius*radius;
}
virtual void Draw() {
}
};
Circle::Circle(int rad) {
radius = rad;
}
class Ellipse:DrawShape {
private:
int xpos, ypos, length, width;
public:
Ellipse(int, int, int, int);
virtual double Area() {
return 3.14*length*width;
}
virtual void Draw() {
}
};
Ellipse::Ellipse(int x, int y, int len, int wid) {
length = len;
width = wid;
xpos = x;
ypos = y;
}
class Rectangle:DrawShape {
private:
int xpos, ypos, length, width;
public:
Rectangle(int, int, int, int);
virtual double Area() {
return length*width;
}
virtual void Draw() {
rectangle(length, width, xpos, ypos);
}
};
Rectangle::Rectangle(int x, int y, int len, int wid) {
length = len;
width = wid;
xpos = x;
ypos = y;
}
class Square:DrawShape {
private:
int xpos, ypos, length;
public:
Square(int);
virtual double Area() {
return length*length;
}
virtual void Draw() {
}
};
Square::Square(int len) {
length = len;
}
int DrawShape::count = 0;
int main() {
initwindow(1024, 768);
settextstyle(GOTHIC_FONT, HORIZ_DIR, 2);
setcolor(WHITE);
outtextxy(0, 0, "CO856 Lab 4B: [S]quare [C]ircle [R]ectangle [E]llipse [T]otal Area");
srand(time(NULL));
DrawShape *shape[100];
char choice;
int RandXPos, RandYPos, RandRadius, RandLength, RandWidth;
int NumShapes = 0;
double totarea;
getch(choice);
while (choice != 'q') {
RandXPos = rand() % 1000;
RandYPos = rand() % 700;
RandLength = rand() % 400;
RandWidth = rand() % 400;
RandRadius = rand() % 500;
if (choice == 'r' || choice == 'R') {
Rectangle *r = new Rectangle(RandXPos, RandYPos, RandLength, RandWidth);
shape[NumShapes] = r;
NumShapes++;
}
}
return 0;
}
I am using virtual functions because of the fact that there are different types of shapes (Circle, Rectangle, Square and Ellipse up to a maximum of 100 shapes total) that use the same two functions Draw() and Area(). It is saying 'r' is not declared for the pointer to type Rectangle and I don't understand why it's giving me that compile error.
