added Revit 2020 SDK files

2026-09-27 13:06:57 +00:00 · 2019-09-11 14:43:53 +02:00
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+//
+// (C) Copyright 2003-2019 by Autodesk, Inc.
+//
+// Permission to use, copy, modify, and distribute this software in
+// object code form for any purpose and without fee is hereby granted,
+// provided that the above copyright notice appears in all copies and
+// that both that copyright notice and the limited warranty and
+// restricted rights notice below appear in all supporting
+// documentation.
+//
+// AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
+// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
+// MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
+// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
+// UNINTERRUPTED OR ERROR FREE.
+//
+// Use, duplication, or disclosure by the U.S. Government is subject to
+// restrictions set forth in FAR 52.227-19 (Commercial Computer
+// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
+// (Rights in Technical Data and Computer Software), as applicable.
+//
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Drawing;
+using Autodesk.Revit.DB;
+using System.Windows.Forms;
+using Point = System.Drawing.Point;
+
+namespace Revit.SDK.Samples.NewHostedSweep.CS
+{
+    /// <summary>
+    /// This class is intent to convenience the geometry transformations.
+    /// It can produce rotation and scale transformations. 
+    /// </summary>
+    public class TrackBall
+    {
+        /// <summary>
+        /// Canvas width.
+        /// </summary>
+        private float m_canvasWidth;
+
+        /// <summary>
+        /// Canvas height.
+        /// </summary>
+        private float m_canvasHeight;
+
+        /// <summary>
+        /// Previous position in 2D.
+        /// </summary>
+        private Point m_previousPosition2D;
+
+        /// <summary>
+        /// Previous position in 3D.
+        /// </summary>
+        private XYZ m_previousPosition3D;
+
+        /// <summary>
+        /// Current rotation transform.
+        /// </summary>
+        private Transform m_rotation = Transform.Identity;
+
+        /// <summary>
+        /// Current scale transform.
+        /// </summary>
+        private double m_scale;
+
+        /// <summary>
+        /// Current rotation transform.
+        /// </summary>
+        public Transform Rotation
+        {
+            get { return m_rotation; }
+            set { m_rotation = value; }
+        }
+
+        /// <summary>
+        /// Current scale transform.
+        /// </summary>
+        public double Scale
+        {
+            get { return m_scale; }
+            set { m_scale = value; }
+        }
+
+        /// <summary>
+        /// Project canvas 2D point to the track ball.
+        /// </summary>
+        /// <param name="width">Canvas width</param>
+        /// <param name="height">Canvas height</param>
+        /// <param name="point">2D point</param>
+        /// <returns>Projected point in track ball</returns>
+        private XYZ ProjectToTrackball(double width, double height, Point point)
+        {
+            double x = point.X / (width / 2);    // Scale so bounds map to [0,0] - [2,2]
+            double y = point.Y / (height / 2);
+
+            x = x - 1;                           // Translate 0,0 to the center
+            y = 1 - y;                           // Flip so +Y is up instead of down
+
+            double d, t, z;
+
+            d = Math.Sqrt(x * x + y * y);
+            if (d < 0.70710678118654752440)
+            {    /* Inside sphere */
+                z = Math.Sqrt(1 - d * d);
+            }
+            else
+            {           /* On hyperbola */
+                t = 1 / 1.41421356237309504880;
+                z = t * t / d;
+            }
+            return new XYZ(x, y, z);
+        }
+
+        /// <summary>
+        /// Yield the rotation transform according to current 2D point in canvas.
+        /// </summary>
+        /// <param name="currentPosition">2D point in canvas</param>
+        private void Track(Point currentPosition)
+        {
+            XYZ currentPosition3D = ProjectToTrackball(
+                m_canvasWidth, m_canvasHeight, currentPosition);
+
+            XYZ axis = m_previousPosition3D.CrossProduct(currentPosition3D);
+            if (axis.GetLength() == 0) return;
+
+            double angle = m_previousPosition3D.AngleTo(currentPosition3D);
+            m_rotation = Transform.CreateRotation(axis, -angle);
+            m_previousPosition3D = currentPosition3D;
+        }
+
+        /// <summary>
+        /// Yield the scale transform according to current 2D point in canvas.
+        /// </summary>
+        /// <param name="currentPosition">2D point in canvas</param>
+        private void Zoom(Point currentPosition)
+        {
+            double yDelta = currentPosition.Y - m_previousPosition2D.Y;
+
+            double scale = Math.Exp(yDelta / 100);    // e^(yDelta/100) is fairly arbitrary.
+
+            m_scale = scale;
+        }
+
+        /// <summary>
+        /// Mouse down, initialize the transformation to identity.
+        /// </summary>
+        /// <param name="width">Canvas width</param>
+        /// <param name="height">Canvas height</param>
+        /// <param name="e"></param>
+        public void OnMouseDown(float width, float height, MouseEventArgs e)
+        {
+            m_rotation = Transform.Identity;
+            m_scale = 1.0;
+            m_canvasWidth = width;
+            m_canvasHeight = height;
+            m_previousPosition2D = e.Location;
+            m_previousPosition3D = ProjectToTrackball(m_canvasWidth,
+                                                     m_canvasHeight,
+                                                     m_previousPosition2D);
+        }
+
+        /// <summary>
+        /// Mouse move with left button press will yield the rotation transform,
+        /// with right button press will yield scale transform.
+        /// </summary>
+        /// <param name="e"></param>
+        public void OnMouseMove(MouseEventArgs e)
+        {
+            Point currentPosition = e.Location;
+
+            // avoid any zero axis conditions
+            if (currentPosition == m_previousPosition2D) return;
+
+            // Prefer tracking to zooming if both buttons are pressed.
+            if (e.Button == MouseButtons.Left)
+            {
+                Track(currentPosition);
+            }
+            else if (e.Button == MouseButtons.Right)
+            {
+                Zoom(currentPosition);
+            }
+
+            m_previousPosition2D = currentPosition;
+        }
+
+        /// <summary>
+        /// Arrows key down will also yield the rotation transform.
+        /// </summary>
+        /// <param name="e"></param>
+        public void OnKeyDown(KeyEventArgs e)
+        {
+            XYZ axis = new XYZ(1.0, 0, 0);
+            double angle = 0.1;
+            switch (e.KeyCode)
+            {
+                case Keys.Down: break;
+                case Keys.Up:
+                    angle = -angle;
+                    break;
+                case Keys.Left:
+                    axis = new XYZ(0, 1.0, 0);
+                    angle = -angle;
+                    break;
+                case Keys.Right:
+                    axis = new XYZ(0, 1.0, 0);
+                    break;
+                default: break;
+            }
+            m_rotation = Transform.CreateRotation(axis, angle);
+        }
+    }
+}