#2 - Added zoom in/out shortcut and menu item

Canvas.cs

@@ -432,11 +432,19 @@ private Vector2 Snap(Vector2 point, params Vector2[] hints)
 		protected override void OnMouseWheel(MouseEventArgs e)
 		{
 			base.OnMouseWheel(e);
+			Zoom(e.Delta > 0 ? 1.1f : 1 / 1.1f, e.X, e.Y);
+		}
 
-			viewMatrix.Translate(-e.X, -e.Y, MatrixOrder.Append);
-			if (e.Delta > 0) viewMatrix.Scale(1.1f, 1.1f, MatrixOrder.Append);
-			else viewMatrix.Scale(1 / 1.1f, 1 / 1.1f, MatrixOrder.Append);
-			viewMatrix.Translate(e.X, e.Y, MatrixOrder.Append);
+		public void Zoom(float scale)
+		{
+			Zoom(scale, Width / 2, Height / 2);
+		}
+
+		public void Zoom(float scale, int x, int y)
+		{
+			viewMatrix.Translate(-x, -y, MatrixOrder.Append);
+			viewMatrix.Scale(scale, scale, MatrixOrder.Append);
+			viewMatrix.Translate(x, y, MatrixOrder.Append);
 
 			matrixUpdated = true;
 

MainForm.cs

@@ -336,6 +336,8 @@ protected override void OnKeyDown(KeyEventArgs e)
 			else if (e.KeyCode == Keys.OemSemicolon && e.Modifiers == Keys.None) AddComment(false);
 			else if (e.KeyCode == Keys.OemSemicolon && e.Modifiers == Keys.Shift) AddComment(true);
 			else if (e.KeyCode == Keys.OemQuestion && e.Modifiers == Keys.None) ToggleComment();
+			else if (e.KeyCode == Keys.Oemplus && e.Modifiers == Keys.None) canvas.Zoom(1.1f);
+			else if (e.KeyCode == Keys.OemMinus && e.Modifiers == Keys.None) canvas.Zoom(1 / 1.1f);
 			else { e.Handled = false; }
 
 			if (e.Handled && e.Alt) { e.SuppressKeyPress = true; }
@@ -382,5 +384,7 @@ protected override void OnKeyDown(KeyEventArgs e)
 		private void convertToOutlineToolStripMenuItem_Click(object sender, EventArgs e) => ConvertToOutline();
 		private void rotateToolStripMenuItem_Click(object sender, EventArgs e) => canvas.StartMouseRotate();
 		private void commentUncommentLinesToolStripMenuItem_Click(object sender, EventArgs e) => ToggleComment();
+		private void zoomInToolStripMenuItem_Click(object sender, EventArgs e) => canvas.Zoom(1.5f);
+		private void zoomOutToolStripMenuItem_Click(object sender, EventArgs e) => canvas.Zoom(1 / 1.5f);
 	}
 }