my onscreen object has a var rotation (in degrees).
how do i fix it so when i push up arrow it move forwards and not just x++ and y++?
my onscreen object has a var rotation (in degrees).
how do i fix it so when i push up arrow it move forwards and not just x++ and y++?
Use trigonometry.
You have the angle and the length of movement (which is your hypotenuse) so you should be able to use sin or cos to calculate the amount of x and y movement required.
x += sin(rotation) * speed;
y += cos(rotation) * speed;
But it depends on the orientation of your rotation. This code will work for rotation orientated up (north) at 0 degrees, moving clock-wise.
Not 100% sure that this is what you want, but I think you want to do:
x += speed * cos(angle);
y += speed * sin(angle);
Where angle
is the rotation of your object, and x
and y
are its coordinates. speed
is the speed of your object.
Just to clarify, since this is C#, you'd want to do this
double radians = (Math.PI/180)*angleInDegrees;
x += speed * Math.Cos(radians);
y += speed * Math.Sin(radians);
As other posters have mentioned, this is based on using trigonometry to apply a rotation to a speed vector (in this case, the 0 degrees vector is pointing to the right).