Merge pull request #134 from rajter/StepRotateBranch

Step rotate branch
PintaProject · May 2, 2019 · f429bdb · f429bdb
2 parents 936d6aa + 6280566
commit f429bdb
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Showing 5 changed files with 52 additions and 15 deletions.
diff --git a/.gitignore b/.gitignore
@@ -24,6 +24,7 @@ po/Makefile.in.in
 po/POTFILES
 po/stamp-it
 xdg/pinta.desktop
+.vs
 
 # Help
 help/*/*.mo

diff --git a/Pinta.Core/Effects/Utility.cs b/Pinta.Core/Effects/Utility.cs
@@ -639,5 +639,26 @@ public static int FastDivideShortByByte(ushort n, byte d)
             0x80808081, 0x00000000, 39  // 255
         };
 
-	}
+         /// <summary>
+         /// Gets the nearest step angle in radians.
+         /// </summary>
+         /// <returns>The nearest step angle in radians.</returns>
+         /// <param name="angle">Angle in radians.</param>
+         /// <param name="steps">Number of steps to divide the circle.</param>
+        public static double GetNearestStepAngle (double angle, int steps)
+        {
+            double fullTurn = 2 * Math.PI;
+            double stepAngle = fullTurn / steps;
+            double normalizedAngle = angle % fullTurn;
+            int sector = Convert.ToInt32 (Math.Truncate ((normalizedAngle % fullTurn) / stepAngle));
+
+            var leftStepAngle = sector * stepAngle;
+            var rightStepAngle = (sector + 1) * stepAngle;
+
+            if ((angle - leftStepAngle) < (rightStepAngle - angle))
+                return leftStepAngle;
+            else
+                return rightStepAngle;
+        }
+    }
 }
diff --git a/Pinta.Tools/Tools/BaseTransformTool.cs b/Pinta.Tools/Tools/BaseTransformTool.cs
@@ -31,19 +31,21 @@ namespace Pinta.Tools
 {
 	public abstract class BaseTransformTool : BaseTool
 	{
-		#region Members
-		private readonly Matrix transform = new Matrix();
+        #region Members
+        private readonly int rotate_steps = 32;
+        private readonly Matrix transform = new Matrix();
 		private Rectangle source_rect;
 		private PointD original_point;
 		private bool is_dragging = false;
 		private bool is_rotating = false;
-		#endregion
-
-		#region Constructor
-		/// <summary>
-		/// Initializes a new instance of the <see cref="Pinta.Tools.BaseTransformTool"/> class.
-		/// </summary>
-		public BaseTransformTool ()
+        private bool rotateBySteps = false;
+        #endregion
+
+        #region Constructor
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Pinta.Tools.BaseTransformTool"/> class.
+        /// </summary>
+        public BaseTransformTool ()
 		{
 		}
 		#endregion
@@ -115,7 +117,10 @@ protected virtual void OnFinishTransform()
 
 			if (is_rotating)
 			{
-				transform.Translate(center.X, center.Y);
+                if (rotateBySteps)
+                    angle = Utility.GetNearestStepAngle (angle, rotate_steps);
+
+                transform.Translate(center.X, center.Y);
 				transform.Rotate(-angle);
 				transform.Translate(-center.X, -center.Y);
 			}
@@ -134,7 +139,17 @@ protected override void OnMouseUp (Gtk.DrawingArea canvas, Gtk.ButtonReleaseEven
 
 			OnFinishTransform();
 		}
-		#endregion
-	}
+
+        protected override void OnKeyDown (Gtk.DrawingArea canvas, Gtk.KeyPressEventArgs args)
+        {
+            rotateBySteps = (args.Event.Key == Gdk.Key.Shift_L);
+        }
+
+        protected override void OnKeyUp (Gtk.DrawingArea canvas, Gtk.KeyReleaseEventArgs args)
+        {
+            rotateBySteps = false;
+        }
+        #endregion
+    }
 }
 
diff --git a/Pinta.Tools/Tools/MoveSelectedTool.cs b/Pinta.Tools/Tools/MoveSelectedTool.cs
@@ -46,7 +46,7 @@ public class MoveSelectedTool : BaseTransformTool
 			get { return "Tools.Move.png"; }
 		}
 		public override string StatusBarText {
-			get { return Catalog.GetString ("Left click and drag the selection to move selected content. Right click and drag the selection to rotate selected content."); }
+			get { return Catalog.GetString ("Left click and drag the selection to move selected content. Right click and drag the selection to rotate selected content. Hold Shift to rotate in steps."); }
 		}
 		public override Gdk.Cursor DefaultCursor {
 			get { return new Gdk.Cursor (Gdk.Display.Default, PintaCore.Resources.GetIcon ("Tools.Move.png"), 0, 0); }

diff --git a/Pinta.Tools/Tools/MoveSelectionTool.cs b/Pinta.Tools/Tools/MoveSelectionTool.cs
@@ -45,7 +45,7 @@ public class MoveSelectionTool : BaseTransformTool
 			get { return "Tools.MoveSelection.png"; }
 		}
 		public override string StatusBarText {
-			get { return Catalog.GetString ("Left click and drag the selection to move selection outline. Right click and drag the selection to rotate selection outline."); }
+			get { return Catalog.GetString ("Left click and drag the selection to move selection outline. Right click and drag the selection to rotate selection outline. Hold Shift to rotate in steps."); }
 		}
 		public override Gdk.Cursor DefaultCursor {
             get { return new Gdk.Cursor (Gdk.Display.Default, PintaCore.Resources.GetIcon ("Tools.MoveSelection.png"), 0, 0); }