bouncingcircles.cpp

#include <windows.h>

int main(){
	int w = GetSystemMetrics(0), h = GetSystemMetrics(1);
	int signX = 1;
    int signY = 1;
    int signX1 = 1;
    int signY1 = 1;
    int incrementor = 10;
    int x = 10;
    int y = 10;
	while(1){
		HDC hdc = GetDC(0);
        x += incrementor * signX;
        y += incrementor * signY;
		int top_x = 0 + x;
        int top_y = 0 + y;
        int bottom_x = 100 + x;
        int bottom_y = 100 + y; 
    	HBRUSH brush = CreateSolidBrush(RGB(rand() % 255, rand() % 255, rand() % 255));
    	SelectObject(hdc, brush);
		Ellipse(hdc, top_x, top_y, bottom_x, bottom_y);
        if (y >= GetSystemMetrics(SM_CYSCREEN))
        {
                signY = -1;
        }
 
        if (x >= GetSystemMetrics(SM_CXSCREEN))
        {
            signX = -1;
        }
 
        if (y == 0)
        {
            signY = 1;
        }
 
        if (x == 0)
        {
            signX = 1;
        }
        Sleep(10);
    	DeleteObject(brush);
        ReleaseDC(0, hdc);
	}
}