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DampedSpring.cs
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DampedSpring.cs
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/*
* Copyright (c) 2023 Codefoco (codefoco@codefoco.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
using System;
using System.ComponentModel;
using cpConstraint = System.IntPtr;
#if __IOS__ || __TVOS__ || __WATCHOS__ || __MACCATALYST__
using ObjCRuntime;
#endif
namespace Tizen.NUI.Physics2D.Chipmunk
{
/// <summary>
/// <see cref="DampedSpring"/> is a damped spring.
/// The spring allows you to define the rest length, stiffness and damping.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public class DampedSpring : Constraint
{
/// <summary>
/// Check if a constraint is a <see cref="DampedSpring"/>.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static bool IsDampedSpring(Constraint constraint) => NativeMethods.cpConstraintIsDampedSpring(constraint.Handle) != 0;
/// <summary>
/// Defined much like a slide joint.
/// </summary>
/// <param name="bodyA">The first connected body.</param>
/// <param name="bodyB">The second connected body.</param>
/// <param name="anchorA">Anchor point a, relative to body a.</param>
/// <param name="anchorB"> Anchor point b, relative to body b.</param>
/// <param name="restLength">The distance the spring wants to be.</param>
/// <param name="stiffness">The spring constant (Young’s modulus).</param>
/// <param name="damping">How soft to make the damping of the spring.</param>
[EditorBrowsable(EditorBrowsableState.Never)]
public DampedSpring(
Body bodyA,
Body bodyB,
Vect anchorA,
Vect anchorB,
double restLength,
double stiffness,
double damping)
: base(NativeMethods.cpDampedSpringNew(
bodyA.Handle,
bodyB.Handle,
anchorA,
anchorB,
restLength,
stiffness,
damping))
{
originalForceCallbackPointer = NativeMethods.cpDampedSpringGetSpringForceFunc(Handle);
}
#if __IOS__ || __TVOS__ || __WATCHOS__ || __MACCATALYST__
#pragma warning disable CA1416 // Validate platform compatibility
[MonoPInvokeCallback(typeof(DampedSpringForceFunction))]
#pragma warning restore CA1416 // Validate platform compatibility
#endif
private static double DampedSpringForceCallback(cpConstraint springHandle, double distance)
{
var constraint = (DampedSpring)Constraint.FromHandle(springHandle);
Func<DampedSpring, double, double> dampedSpringForceFunction = constraint.forceFunction;
return dampedSpringForceFunction(constraint, distance);
}
private static DampedSpringForceFunction dampedSpringForceCallback = DampedSpringForceCallback;
/// <summary>
/// The location of the first anchor relative to the first body.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public Vect AnchorA
{
get => NativeMethods.cpDampedSpringGetAnchorA(Handle);
set => NativeMethods.cpDampedSpringSetAnchorA(Handle, value);
}
/// <summary>
/// The location of the second anchor relative to the second body.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public Vect AnchorB
{
get => NativeMethods.cpDampedSpringGetAnchorB(Handle);
set => NativeMethods.cpDampedSpringSetAnchorB(Handle, value);
}
/// <summary>
/// The rest length of the spring.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public double RestLength
{
get => NativeMethods.cpDampedSpringGetRestLength(Handle);
set => NativeMethods.cpDampedSpringSetRestLength(Handle, value);
}
/// <summary>
/// The stiffness of the spring in force/distance.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public double Stiffness
{
get => NativeMethods.cpDampedSpringGetStiffness(Handle);
set => NativeMethods.cpDampedSpringSetStiffness(Handle, value);
}
/// <summary>
/// The damping of the spring.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public double Damping
{
get => NativeMethods.cpDampedSpringGetDamping(Handle);
set => NativeMethods.cpDampedSpringSetDamping(Handle, value);
}
private Func<DampedSpring, double, double> forceFunction;
private IntPtr originalForceCallbackPointer;
/// <summary>
/// Damped spring force custom function callback.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public Func<DampedSpring, double, double> ForceFunction
{
get => forceFunction;
set
{
forceFunction = value;
IntPtr callbackPointer;
if (value == null)
{
callbackPointer = originalForceCallbackPointer;
}
else
{
callbackPointer = dampedSpringForceCallback.ToFunctionPointer();
}
NativeMethods.cpDampedSpringSetSpringForceFunc(Handle, callbackPointer);
}
}
}
}