public frame(int f1, double x1, double y1) {
public keyFrame(int f, double x1, double y1) {
public static void Main()
keyFrame x0 = new keyFrame (0,1,0);
keyFrame x1 = new keyFrame (1,0,2);
keyFrame x2 = new keyFrame ();
keyFrame x3 = new keyFrame (3,10,0);
keyFrame[] kf = new keyFrame[4];
frame[] f = new frame[4];
for(int i = 0; i < kf.Length; i++) {
if(kf[i].valid == false) {
for (int k = i+1; k < kf.Length; k++) {
for(int i = 0; i < kf.Length; i++) {
Console.WriteLine(f[i].x);