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using System;
namespace MurderGame;
using Sandbox;
// It's just a square with a material slapped onto it.
public class Footprint : RenderEntity
{
public Material SpriteMaterial { get; set; }
public float SpriteScale { get; set; } = 18f;
public bool Enabled { get; set; } = true;
public Color Color { get; set; }
private TimeSince TimeSinceCreated = 0;
[GameEvent.Tick.Client]
public void OnTick()
{
if ( !(TimeSinceCreated > Math.Clamp(MurderGame.MaxFootprintTime, 0, 30)) )
{
return;
}
Enabled = false;
Delete();
}
public override void DoRender(SceneObject obj)
{
if (!Enabled) return;
// Allow lights to affect the sprite
Graphics.SetupLighting(obj);
// Create the vertex buffer for the sprite
var vb = new VertexBuffer();
vb.Init(true);
// Vertex buffers are in local space, so we need the camera position in local space too
var normal = new Vector3( 0, 0.01f, 100 );
var w = normal.Cross(Vector3.Down).Normal;
var h = normal.Cross(w).Normal;
float halfSpriteSize = SpriteScale / 2;
// Add a single quad to our vertex buffer
vb.AddQuad(new Ray(default, normal), halfSpriteSize*w, h*halfSpriteSize);
Graphics.Attributes.Set( "color", Color);
// Draw the sprite
vb.Draw( SpriteMaterial );
}
}
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