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Packages/com.arongranberg.aline/ExampleScenes~/Example2_CurveEditor/CurveEditor.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using Drawing;
+
+namespace Drawing.Examples {
+	/// <summary>Simple bezier curve editor</summary>
+	[HelpURL("http://arongranberg.com/aline/documentation/stable/curveeditor.html")]
+	public class CurveEditor : MonoBehaviour {
+		List<CurvePoint> curves = new List<CurvePoint>();
+		Camera cam;
+		public Color curveColor;
+
+		class CurvePoint {
+			public Vector2 position, controlPoint0, controlPoint1;
+		}
+
+		void Awake () {
+			cam = Camera.main;
+		}
+
+		void Update () {
+			// Add a new control point when clicking
+			if (Input.GetKeyDown(KeyCode.Mouse0)) {
+				curves.Add(new CurvePoint {
+					position = (Vector2)Input.mousePosition,
+					controlPoint0 = Vector2.zero,
+					controlPoint1 = Vector2.zero,
+				});
+			}
+
+			// Keep adjusting the position of the control point while the mouse is pressed
+			if (curves.Count > 0 && Input.GetKey(KeyCode.Mouse0) && ((Vector2)Input.mousePosition - curves[curves.Count - 1].position).magnitude > 2*2) {
+				var point = curves[curves.Count - 1];
+				point.controlPoint1 = (Vector2)Input.mousePosition - point.position;
+				point.controlPoint0 = -point.controlPoint1;
+			}
+
+			Render();
+		}
+
+		void Render () {
+			// Use a custom builder which renders even in standalone games
+			// and in the editor even if gizmos are disabled.
+			// Usually you would use the static Draw class instead.
+			using (var draw = DrawingManager.GetBuilder(true)) {
+				// Draw the curves in 2D using pixel coordinates
+				using (draw.InScreenSpace(cam)) {
+					// Draw a circle at each curve control point
+					for (int i = 0; i < curves.Count; i++) {
+						draw.xy.Circle((Vector3)curves[i].position, 2, Color.blue);
+					}
+
+					// Draw each bezier curve segment
+					for (int i = 0; i < curves.Count - 1; i++) {
+						var p0 = curves[i].position;
+						var p1 = p0 + curves[i].controlPoint1;
+						var p3 = curves[i+1].position;
+						var p2 = p3 + curves[i+1].controlPoint0;
+						draw.Bezier((Vector3)p0, (Vector3)p1, (Vector3)p2, (Vector3)p3, curveColor);
+					}
+				}
+			}
+		}
+	}
+}