Modding:Block and Item Interactions: Difference between revisions

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Modding:Block and Item Interactions (view source)

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This tutorial should introduce you into the basics of custom interactions. We will create a magic wand which should spawn particles when holding right click.
<languages/>
__FORCETOC__
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{{GameVersion|1.19.3}}
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== Preparations ==
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This tutorial will introduce you into the basics of custom interactions. We will create a magic wand which will spawn particles when holding right click.
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= Preparations = <!--T:3-->
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I highly recommend to read about [[Advanced Items|The Item Class]] first. Additionally you can download the assets [https://wiki.vintagestory.at/images/4/4d/MagicWand_-_No_CS_File.zip here].
I highly recommend to read about [[Advanced Items|The Item Class]] first. Additionally you can download the assets [https://wiki.vintagestory.at/images/4/4d/MagicWand_-_No_CS_File.zip here].
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All of this should be familiar to you, creating and registering the item class ...
All of this should be familiar to you, creating and registering the item class ...
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<syntaxhighlight lang="c#">
<syntaxhighlight lang="c#">
     public class Magic : ModBase
     public class Magic : ModSystem
     {
     {


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</syntaxhighlight>
</syntaxhighlight>


== Adding particles ==
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== Adding particles == <!--T:6-->
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Now we need to implement the interact function. First of all we need to specify that the player can "use" this tool, therefore we need to set handling to <code>handled</code> ...
Now we need to implement the interact function. First of all we need to specify that the player can "use" this tool, therefore we need to set handling to <code>handled</code> ...
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<syntaxhighlight lang="c#">
<syntaxhighlight lang="c#">
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</syntaxhighlight>
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The method <code>OnHeldInteractStep</code> allows us to spawn particles per tick while the player is using the item, but it would be better to implement an animation first. Particles should spawn after the animation is done ...
The method <code>OnHeldInteractStep</code> allows us to spawn particles per tick while the player is using the item, but it would be better to implement an animation first. Particles should spawn after the animation is done ...
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<syntaxhighlight lang="c#">
<syntaxhighlight lang="c#">
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Holding rightclick ...
Holding rightclick ...


<!--T:10-->
[[File:Magic Stick Interact.gif|300px]]
[[File:Magic Stick Interact.gif|300px]]


<!--T:11-->
So let's start to mess around with particles, therefore we need a static particle type ...
So let's start to mess around with particles, therefore we need a static particle type ...
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<syntaxhighlight lang="c#">
<syntaxhighlight lang="c#">
         public static SimpleParticleProperties particles = new SimpleParticleProperties(
         public static SimpleParticleProperties particles = new SimpleParticleProperties(
                     1, 1,
                     1, 1,
                     ColorUtil.ColorFromArgb(50, 220, 220, 220),
                     ColorUtil.ColorFromRgba(220, 220, 220, 50),
                     new Vec3d(),
                     new Vec3d(),
                     new Vec3d(),
                     new Vec3d(),
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</syntaxhighlight>
</syntaxhighlight>


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Particles should spawn once the animation is completed. This will be the case after <code>0.6</code> seconds ...
Particles should spawn once the animation is completed. This will be the case after <code>0.6</code> seconds ...
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<syntaxhighlight lang="c#">
<syntaxhighlight lang="c#">
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</syntaxhighlight>


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I suggest to read the tutorial about [[Simple Particles]] first. This code will spawn particles in front of the player with a randomized color and a sinus evolving size ...
I suggest to read the tutorial about [[Simple Particles]] first. This code will spawn particles in front of the player with a randomized color and a sinus evolving size ...
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<syntaxhighlight lang="c#">
<syntaxhighlight lang="c#">
                     Vec3d pos =
                     Vec3d pos =
                             byEntity.Pos.XYZ.Add(0, byEntity.EyeHeight(), 0)
                             byEntity.Pos.XYZ.Add(0, byEntity.LocalEyePos.Y, 0)
                             .Ahead(1f, byEntity.Pos.Pitch, byEntity.Pos.Yaw)
                             .Ahead(1f, byEntity.Pos.Pitch, byEntity.Pos.Yaw)
                         ;
                         ;


                     Vec3f speedVec = new Vec3d(0, 0, 0).Ahead(5, byEntity.Pos.Pitch, byEntity.Pos.Yaw).ToVec3f();
                     Vec3f speedVec = new Vec3d(0, 0, 0).Ahead(5, byEntity.Pos.Pitch, byEntity.Pos.Yaw).ToVec3f();
                     particles.minVelocity = speedVec;
                     particles.MinVelocity = speedVec;
                     Random rand = new Random();
                     Random rand = new Random();
                     particles.color = ColorUtil.ToRGBABytes(ColorUtil.ColorFromArgb(255, rand.Next(0, 255), rand.Next(0, 255), rand.Next(0, 255)));
                     particles.Color = ColorUtil.ColorFromRgba(rand.Next(0, 255), rand.Next(0, 255), rand.Next(0, 255), 255);
                     particles.minPos = pos.AddCopy(-0.05, -0.05, -0.05);
                     particles.MinPos = pos.AddCopy(-0.05, -0.05, -0.05);
                     particles.addPos.Set(0.1, 0.1, 0.1);
                     particles.AddPos.Set(0.1, 0.1, 0.1);
                     particles.minSize = 0.1F;
                     particles.MinSize = 0.1F;
                     particles.SizeEvolve = EvolvingNatFloat.create(EnumTransformFunction.SINUS, 10);
                     particles.SizeEvolve = EvolvingNatFloat.create(EnumTransformFunction.SINUS, 10);
                     byEntity.World.SpawnParticles(particles);
                     byEntity.World.SpawnParticles(particles);
</syntaxhighlight>
</syntaxhighlight>


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If we put everything together the <code>OnHeldInteractStep</code> method will look like this ...
If we put everything together the <code>OnHeldInteractStep</code> method will look like this ...
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<syntaxhighlight lang="c#">
<syntaxhighlight lang="c#">
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                 {
                 {
                     Vec3d pos =
                     Vec3d pos =
                             byEntity.Pos.XYZ.Add(0, byEntity.EyeHeight, 0)
                             byEntity.Pos.XYZ.Add(0, byEntity.LocalEyePos.Y, 0)
                             .Ahead(1f, byEntity.Pos.Pitch, byEntity.Pos.Yaw)
                             .Ahead(1f, byEntity.Pos.Pitch, byEntity.Pos.Yaw)
                         ;
                         ;


                     Vec3f speedVec = new Vec3d(0, 0, 0).Ahead(5, byEntity.Pos.Pitch, byEntity.Pos.Yaw).ToVec3f();
                     Vec3f speedVec = new Vec3d(0, 0, 0).Ahead(5, byEntity.Pos.Pitch, byEntity.Pos.Yaw).ToVec3f();
                     particles.minVelocity = speedVec;
                     particles.MinVelocity = speedVec;
                     Random rand = new Random();
                     Random rand = new Random();
                     particles.color = ColorUtil.ToRgba(255, rand.Next(0, 255), rand.Next(0, 255), rand.Next(0, 255));
                     particles.Color = ColorUtil.ColorFromRgba(rand.Next(0, 255), rand.Next(0, 255), rand.Next(0, 255), 255);
                     particles.minPos = pos.AddCopy(-0.05, -0.05, -0.05);
                     particles.MinPos = pos.AddCopy(-0.05, -0.05, -0.05);
                     particles.addPos.Set(0.1, 0.1, 0.1);
                     particles.AddPos.Set(0.1, 0.1, 0.1);
                     particles.minSize = 0.1F;
                     particles.MinSize = 0.1F;
                     particles.SizeEvolve = EvolvingNatFloat.create(EnumTransformFunction.SINUS, 10);
                     particles.SizeEvolve = EvolvingNatFloat.create(EnumTransformFunction.SINUS, 10);
                     byEntity.World.SpawnParticles(particles);
                     byEntity.World.SpawnParticles(particles);
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</syntaxhighlight>
</syntaxhighlight>


== Testing ==
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== Testing == <!--T:15-->
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Now we can run our first test, doesn't it look beautiful?
Now we can run our first test, doesn't it look beautiful?
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<youtube>bTPXL97Gfns</youtube>
<youtube>bTPXL97Gfns</youtube>


== Download ==
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= Mod Download = <!--T:17-->
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<!--T:18-->
Feel free to try it out yourself:
Feel free to try it out yourself:
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[https://wiki.vintagestory.at/images/3/38/MagicWand.zip MagicWand.zip]
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<!--T:19-->
Here is my version:
* for VS v1.9: [https://wiki.vintagestory.at/images/7/72/Magicwand_vs1.9_v1.0.0.zip Magicwand_vs1.9_v1.0.0.zip]
* for VS v1.8: [https://wiki.vintagestory.at/images/3/38/MagicWand.zip MagicWand.zip]
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