Calculate new position of player
- by user1439111
Edit: I will summerize my question since it is very long (Thanks Len for pointing it out)
What I'm trying to find out is to get a new position of a player after an X amount of time.
The following variables are known:
- Speed
- Length between the 2 points
- Source position (X, Y)
- Destination position (X, Y)
How can I calculate a position between the source and destion with these variables given?
For example:
source: 0, 0
destination: 10, 0
speed: 1
so after 1 second the players position would be 1, 0
The code below works but it's quite long so I'm looking for something shorter/more logical
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I'm having a hard time figuring out how to calculate a new position of a player ingame.
This code is server sided used to track a player(It's a emulator so I don't have access to the clients code).
The collision detection of the server works fine I'm using bresenham's line algorithm and a raycast to determine at which point a collision happens.
Once I deteremined the collision I calculate the length of the path the player is about to walk and also the total time.
I would like to know the new position of a player each second.
This is the code I'm currently using. It's in C++ but I am porting the server to C# and I haven't written the code in C# yet.
// Difference between the source X - destination X
//and source y - destionation Y
float xDiff, yDiff;
xDiff = xDes - xSrc;
yDiff = yDes - ySrc;
float walkingLength = 0.00F;
float NewX = xDiff * xDiff;
float NewY = yDiff * yDiff;
walkingLength = NewX + NewY;
walkingLength = sqrt(walkingLength);
const float PI = 3.14159265F;
float Angle = 0.00F;
if(xDes >= xSrc && yDes >= ySrc)
{
Angle = atanf((yDiff / xDiff));
Angle = Angle * 180 / PI;
}
else if(xDes < xSrc && yDes >= ySrc)
{
Angle = atanf((-xDiff / yDiff));
Angle = Angle * 180 / PI;
Angle += 90.00F;
}
else if(xDes < xSrc && yDes < ySrc)
{
Angle = atanf((yDiff / xDiff));
Angle = Angle * 180 / PI;
Angle += 180.00F;
}
else if(xDes >= xSrc && yDes < ySrc)
{
Angle = atanf((xDiff / -yDiff));
Angle = Angle * 180 / PI;
Angle += 270.00F;
}
float WalkingTime = (float)walkingLength / (float)speed;
bool Done = false;
float i = 0;
while(i < walkingLength)
{
if(Done == true)
{
break;
}
if(WalkingTime >= 1000)
{
Sleep(1000);
i += speed;
WalkTime -= 1000;
}
else
{
Sleep(WalkTime);
i += speed * WalkTime;
WalkTime -= 1000;
Done = true;
}
if(Angle >= 0 && Angle < 90)
{
float xNew = cosf(Angle * PI / 180) * i;
float yNew = sinf(Angle * PI / 180) * i;
float NewCharacterX = xSrc + xNew;
float NewCharacterY = ySrc + yNew;
}
I have cut the last part of the loop since it's just 3 other else if statements with 3 other angle conditions and the only change is the sin and cos.
The given speed parameter is the speed/second.
The code above works but as you can see it's quite long so I'm looking for a new way to calculate this.
btw, don't mind the while loop to calculate each new position I'm going to use a timer in C#
Thank you very much
