Re: Align object to vector using Dgame framework
On Tuesday, 14 July 2015 at 00:31:56 UTC, codenstuff wrote: On Monday, 13 July 2015 at 19:07:55 UTC, Márcio Martins wrote: On Monday, 13 July 2015 at 16:11:03 UTC, codenstuff wrote: [...] This is not really a game development forum but here you go: auto rads = atan2(object.velocity.y, object.velocity.x); // returns radians auto degs = angle * (180.0f / PI); // convert to degrees shape.rotate(degs); I suggest you store velocity as a Vector2f to avoid later confusion. It is really useful to learn basic linear algebra, and trigonometry as a game developer - you will be needing these tools on a daily basis. This does not work as expected. It keeps rotating object as long as vector is at angle. Any idea how to improve on this? I'm sorry. You should use setRotation() instead, rotate() just adds to the rotation.
Re: Align object to vector using Dgame framework
On Monday, 13 July 2015 at 19:07:55 UTC, Márcio Martins wrote: On Monday, 13 July 2015 at 16:11:03 UTC, codenstuff wrote: [...] This is not really a game development forum but here you go: auto rads = atan2(object.velocity.y, object.velocity.x); // returns radians auto degs = angle * (180.0f / PI); // convert to degrees shape.rotate(degs); I suggest you store velocity as a Vector2f to avoid later confusion. It is really useful to learn basic linear algebra, and trigonometry as a game developer - you will be needing these tools on a daily basis. This does not work as expected. It keeps rotating object as long as vector is at angle. Any idea how to improve on this?
Re: Align object to vector using Dgame framework
On Monday, 13 July 2015 at 16:11:03 UTC, codenstuff wrote:
I've been using Dgame framework for simple simulations.
I need moving object to be aligned to their velocity vectors.
How is it possible to do that using Dgame?
I see that shape object has setRotation and setRotationCenter.
Not sure how to use these to achieve the effect. I realize that
default is rotation around origin. This causes objects to drift
over time.
Sample code
struct GameObject {
Point **position;
// array of pointers to object points
Point *acceleration;
Point *velocity;
double max_speed;
double max_force;
}
shape = new Shape(Geometry.Quads,
Vertex(object.position[0].x, object.position[0].y),
Vertex(object.position[1].x, object.position[1].y),
Vertex(object.position[2].x, object.position[2].y),
Vertex(object.position[3].x, object.position[3].y))
// rotate shape to face velocity here
shape.move(object.velocity.x, object.velocity.y);
This is not really a game development forum but here you go:
auto rads = atan2(object.velocity.y, object.velocity.x); //
returns radians
auto degs = angle * (180.0f / PI); // convert to degrees
shape.rotate(degs);
I suggest you store velocity as a Vector2f to avoid later
confusion.
It is really useful to learn basic linear algebra, and
trigonometry as a game developer - you will be needing these
tools on a daily basis.
Align object to vector using Dgame framework
I've been using Dgame framework for simple simulations.
I need moving object to be aligned to their velocity vectors.
How is it possible to do that using Dgame?
I see that shape object has setRotation and setRotationCenter.
Not sure how to use these to achieve the effect. I realize that
default is rotation around origin. This causes objects to drift
over time.
Sample code
struct GameObject {
Point **position;
// array of pointers to object points
Point *acceleration;
Point *velocity;
double max_speed;
double max_force;
}
shape = new Shape(Geometry.Quads,
Vertex(object.position[0].x, object.position[0].y),
Vertex(object.position[1].x, object.position[1].y),
Vertex(object.position[2].x, object.position[2].y),
Vertex(object.position[3].x, object.position[3].y))
// rotate shape to face velocity here
shape.move(object.velocity.x, object.velocity.y);
