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Rewrite ThrowsParticle using world coordinates.

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The old dynamics were crazy, so this implements
a simpler model using a cubic lerp.
This commit is contained in:
Paul Chote
2013-04-01 12:23:41 +13:00
parent 7b54bbf0b2
commit be250bca76
7 changed files with 57 additions and 81 deletions
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84
OpenRA.Mods.RA/ThrowsParticle.cs
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@@ -8,19 +8,30 @@
*/
#endregion
using OpenRA.FileFormats;
using OpenRA.Graphics;
using OpenRA.Mods.RA.Render;
using OpenRA.Traits;
namespace OpenRA.Mods.RA
{
class ThrowsParticleInfo : ITraitInfo, Requires<RenderUnitInfo>
class ThrowsParticleInfo : ITraitInfo, Requires<RenderSimpleInfo>
{
public readonly string Anim = null;
public readonly int[] Offset = new[] { 0, 0, 0, 0 };
public readonly int[] Spread = new[] { 0, 0 };
public readonly float Speed = 20;
public readonly string AnimKey = null;
[Desc("Initial position relative to body")]
public readonly WVec Offset = WVec.Zero;
[Desc("Maximum distance to throw the particle")]
public readonly WRange ThrowRange = new WRange(768);
[Desc("Maximum height to throw the particle")]
public readonly WRange ThrowHeight = new WRange(256);
[Desc("Number of ticks to animate")]
public readonly int Length = 15;
[Desc("Maximum rotation rate")]
public readonly float ROT = 15;
public object Create(ActorInitializer init) { return new ThrowsParticle(init, this); }
@@ -28,51 +39,56 @@ namespace OpenRA.Mods.RA
class ThrowsParticle : ITick
{
float2 pos;
float alt;
ThrowsParticleInfo info;
WVec pos;
WVec initialPos;
WVec finalPos;
int tick = 0;
float2 v;
float va;
float facing;
float dfacing;
const float gravity = 1.3f;
float rotation;
public ThrowsParticle(ActorInitializer init, ThrowsParticleInfo info)
{
this.info = info;
var self = init.self;
var ifacing = self.Trait<IFacing>();
var ru = self.Trait<RenderUnit>();
var rs = self.Trait<RenderSimple>();
alt = 0;
facing = Turreted.GetInitialTurretFacing( init, 0 );
pos = new Turret(info.Offset).PxPosition(self, ifacing).ToFloat2();
// TODO: Carry orientation over from the parent instead of just facing
var bodyFacing = init.Contains<FacingInit>() ? init.Get<FacingInit,int>() : 0;
facing = Turreted.GetInitialTurretFacing(init, 0);
v = Game.CosmeticRandom.Gauss2D(1) * info.Spread.RelOffset();
dfacing = Game.CosmeticRandom.Gauss1D(2) * info.ROT;
va = info.Speed;
// Calculate final position
var throwRotation = WRot.FromFacing(Game.CosmeticRandom.Next(1024));
var throwOffset = new WVec((int)(Game.CosmeticRandom.Gauss1D(1)*info.ThrowRange.Range), 0, 0).Rotate(throwRotation);
var anim = new Animation(ru.GetImage(self), () => (int)facing);
initialPos = pos = info.Offset.Rotate(rs.QuantizeOrientation(self, WRot.FromFacing(bodyFacing)));
finalPos = initialPos + throwOffset;
// Facing rotation
rotation = Game.CosmeticRandom.Gauss1D(2) * info.ROT;
var anim = new Animation(rs.GetImage(self), () => (int)facing);
anim.PlayRepeating(info.Anim);
ru.anims.Add(info.AnimKey, new AnimationWithOffset(
anim, wr => pos - new float2(0, alt), null));
rs.anims.Add(info.Anim, new AnimationWithOffset(anim, wr => wr.ScreenPxOffset(pos), null));
}
public void Tick(Actor self)
{
va -= gravity;
alt += va;
if (tick == info.Length)
return;
tick++;
if (alt < 0) alt = 0;
else
{
pos += v;
v = .9f * v;
// Lerp position horizontally and height along a sinusoid using a cubic ease
var t = (tick*tick*tick / (info.Length*info.Length) - 3*tick*tick / info.Length + 3*tick);
var tp = WVec.Lerp(initialPos, finalPos, t, info.Length);
var th = new WAngle(512*(info.Length - t) / info.Length).Sin()*info.ThrowHeight.Range / 1024;
pos = new WVec(tp.X, tp.Y, th);
facing += dfacing;
dfacing *= .9f;
}
// Spin the particle
facing += rotation;
rotation *= .9f;
}
}
}