public static float getPercentBB(BBox[] boxes, int size)
{
int sum = 0;
for (int i = 0; i < size; i++)
{
sum+= boxes[i].isValid();
}
return (float)sum/size * 100;
}
public static unsafe float getPercentBBInterop(BBox[] boxes, int size)
{
float result;
fixed (BBox* p = boxes)
{
result = nativef((IntPtr)p, size);
}
return result;
}
public float x1, y1, x2, y2; //Corner points of the rectangle
#region Methods
//Initialize array
public static BBox[] getBBArray(int n)
{
BBox[] arr = new BBox[n];
Random r = new Random();
for (int i = 0; i < arr.Length; i++)
{
arr[i].x1 = (float)r.NextDouble() * 2;
arr[i].y1 = (float)r.NextDouble() * 2;
arr[i].x2 = (float)r.NextDouble() * 2;
arr[i].y2 = (float)r.NextDouble() * 2;
}
return arr;
}
static void Main(string[] args)
{
System.Console.WriteLine("Initializing 10^7 boxes randomly lying between (0,0) and (2,2).\n");
BBox[] arr = BBox.getBBArray(10000000);
for (int j = 3; j < 8; j++)
{
int n = (int)Math.Pow(10, j);
System.Console.WriteLine("For 10^{0} elements: \n", j);
//Calculate using native c#
System.Console.WriteLine("Calculating with C# [10 iterations]:");
float perc = 0; double time = 0;
for (int i = 0; i < 10; i++)
{
var s1 = Stopwatch.StartNew();
perc = BBox.getPercentBB(arr, n);
s1.Stop();
time += s1.Elapsed.TotalMilliseconds;
}
System.Console.WriteLine("The Percentage of boxes that lie between (0,0) and (1,1) are : {0}%.", perc);
System.Console.WriteLine("The Calculation took: {0} milliseconds. \n", time / 10);
//Interop with Marshaling
System.Console.WriteLine("Calculating with Marshaling Interop [10 iterations]:");
time = 0;
for (int i = 0; i < 10; i++)
{
var s3 = Stopwatch.StartNew();
perc = BBox.getPercentBBMarshal(arr, n);
s3.Stop();
time += s3.Elapsed.TotalMilliseconds;
}
System.Console.WriteLine("The Percentage of boxes that lie between (0,0) and (1,1) are : {0}%.", perc);
System.Console.WriteLine("The Calculation took: {0} milliseconds. \n", time / 10);
//Interop with raw pointers
System.Console.WriteLine("Calculating with Pointer Interop [10 iterations]:");
time = 0;
for (int i = 0; i < 10; i++)
{
var s2 = Stopwatch.StartNew();
perc = BBox.getPercentBBInterop(arr, n);
s2.Stop();
time += s2.Elapsed.TotalMilliseconds;
}
System.Console.WriteLine("The Percentage of boxes that lie between (0,0) and (1,1) are : {0}%.", perc);
System.Console.WriteLine("The Calculation took: {0} milliseconds. \n", time / 10);
}
}
//Initialize array
public static BBox[] getBBArray(int n)
{
BBox[] arr = new BBox[n];
Random r = new Random();
for (int i = 0; i < arr.Length; i++)
{
arr[i].x1 = (float)r.NextDouble() * 2;
arr[i].y1 = (float)r.NextDouble() * 2;
arr[i].x2 = (float)r.NextDouble() * 2;
arr[i].y2 = (float)r.NextDouble() * 2;
}
return(arr);
}