0
\$\begingroup\$

I have written a program to record the x,y,z coordinated of the Hand joint and I want to animate my models 2D or 3D according to these coordinates. . .However the output of the x,y,z coordinates are fluctuating from -0 to 1 but not more than that..

So i assume I will need to multiply them back with the screen width and height, however it still doesnt seem to animate according to the original x,y,z points

Any transformations I might be missing out?

 protected override void Update(GameTime gameTime) { position += spriteSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds; //// TODO: Add your update logic here using (StreamReader r = new StreamReader(f)) { string line; Viewport view = graphics.GraphicsDevice.Viewport; int maxWidth = view.Width; int maxHeight = view.Height; // int i = 0; while ((line = r.ReadLine()) != null) { string[] temp = line.Split(','); int x = (int) Math.Floor((float.Parse(temp[0]) * 0.5f) + 0.5f) maxWidth); int y = (int) Math.Floor((float.Parse(temp[1]) * -0.5f) + 0.5f) * maxHeight); motion.Add(new Point(x, y)); // Console.WriteLine(temp[0] + "," + temp[1] + "," + motion[i].X+ "," + motion[i].Y); // i++; } } // foreach (Point s in motion) { position.X = motion[i].X; position.Y = motion[i].Y; } // i++; a_butterfly_up.Update(gameTime); a_butterfly_side.Update(gameTime); G_vidPlayer.Play(mossV); base.Update(gameTime); }
\$\endgroup\$

2 Answers 2

Reset to default
1
\$\begingroup\$

It may be 0 most of the time, as you cast to int before you multiply (btw. your brackets are somehow messed up anyway). Maybe try this code instead:

 int x = (int) (float.Parse(temp[0])* maxWidth); int y = (int) (float.Parse(temp[1]) * maxHeight);

Regards!

EDIT:

Your code looks a bit messed up: At the beginning you use position += spriteSpeed * (float)gameTime.ElapsedGameTime.TotalSeconds; which make not really sense to me as you overwrite position later on. I am not able to test much on my current machine, so I will give you a pseudo code snippet of how I would address this problem:

int your objects add: Vector2D position; Vector2D target;

public void Update(GameTime gameTime) { if position!= target position+=target-position*gameTime*speed; }

In the main loop do the following:

protected override void Update(GameTime gameTime) { Get the target location from your stream Set the target of the desired object to the retrieved point Update every object base.Update(gameTime); }

This is full pseudo code but might give you a headstart to implement the movement.

Regards!

\$\endgroup\$
7
  • \$\begingroup\$ I had tried this before but its not correct! Yes i'm sorry for the brackets its supposed to be one less \$\endgroup\$ Commented Sep 21, 2012 at 11:39
  • \$\begingroup\$ Have you tried debugging the values you receive for x and y? Just to make sure the error happens here and not in the animation itself \$\endgroup\$ Commented Sep 21, 2012 at 11:43
  • \$\begingroup\$ yes i have added a breakpoint and the values are fine. . .im guessing there is smth more i have to do before i can get the actually x,y,z values \$\endgroup\$ Commented Sep 21, 2012 at 11:53
  • \$\begingroup\$ Maybe add the animation logic to the topic. If your values are fine, then the error is clearly not rooted in the above snippet \$\endgroup\$ Commented Sep 21, 2012 at 11:55
  • \$\begingroup\$ I have added the logic above. . just changed the x,y param \$\endgroup\$ Commented Sep 21, 2012 at 12:06
0
\$\begingroup\$

This seems to work well for now . .however I dont understand the Why need to multiply or add 0.5f to the maxWidth or maxheight. . .

 using (StreamReader r = new StreamReader(f)) { string line; Viewport view = graphics.GraphicsDevice.Viewport; int maxWidth = view.Width; int maxHeight = view.Height; while ((line = r.ReadLine()) != null) { string[] temp = line.Split(','); int x = (int) Math.Floor(((float.Parse(temp[0]) * 0.5f) + 0.5f) * maxWidth); int y = (int) Math.Floor(((float.Parse(temp[1]) * -0.5f) + 0.5f) *maxHeight); motion.Add(new Point(x, y)); } } position.X = motion_2[i].X; position.Y = motion_2[i].Y; i++;
\$\endgroup\$
10
  • \$\begingroup\$ I dont think you need to do this. It will stretch your movements in a wrong way. Tryo to multiply y with -1 and keep the 0.5 out of the calculation \$\endgroup\$ Commented Sep 24, 2012 at 7:54
  • \$\begingroup\$ I'll try this .. but what about the Z values ? ? Do i need any transformations for that too \$\endgroup\$ Commented Sep 24, 2012 at 12:55
  • \$\begingroup\$ I just tried it out . . What happens is the if i remove the 0.5f . . the smiley (sprite) just goes out of the screen . . \$\endgroup\$ Commented Sep 24, 2012 at 13:15
  • \$\begingroup\$ int x = (int) Math.Floor(((float.Parse(temp[0])*1f) * maxWidth); int y = (int) Math.Floor(((float.Parse(temp[1]) * -1f) *maxHeight); this doesn´t work ? \$\endgroup\$ Commented Sep 25, 2012 at 7:45
  • \$\begingroup\$ I'm sorry to reply after really long . . but 1f doesnt work apparent 0.5f is more accurate somehow . . which doesnt even make sense to me :-/ \$\endgroup\$ Commented Sep 28, 2012 at 21:05

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.