Update drag info

SpriteLibrary/SpriteEntryForm.Designer.cs

@@ -81,6 +81,9 @@
             this.pbImageField.Size = new System.Drawing.Size(213, 306);
             this.pbImageField.TabIndex = 0;
             this.pbImageField.TabStop = false;
+            this.pbImageField.MouseDown += new System.Windows.Forms.MouseEventHandler(this.pbImageField_MouseDown);
+            this.pbImageField.MouseMove += new System.Windows.Forms.MouseEventHandler(this.pbImageField_MouseMove);
+            this.pbImageField.MouseUp += new System.Windows.Forms.MouseEventHandler(this.pbImageField_MouseUp);
             // 
             // cbStartingImage
             // 
@@ -105,9 +108,9 @@
             this.lblChosenArea.AutoSize = true;
             this.lblChosenArea.Location = new System.Drawing.Point(129, 44);
             this.lblChosenArea.Name = "lblChosenArea";
-            this.lblChosenArea.Size = new System.Drawing.Size(46, 17);
+            this.lblChosenArea.Size = new System.Drawing.Size(86, 17);
             this.lblChosenArea.TabIndex = 3;
-            this.lblChosenArea.Text = "label2";
+            this.lblChosenArea.Text = "ChosenArea";
             // 
             // tbNumFrames
             // 

SpriteLibrary/SpriteEntryForm.cs

@@ -27,6 +27,10 @@ namespace SpriteLibrary
         int CurrentSIIndex = -1;  //The information item we are editing.  -1 means it is a new one.
         int CurrentSIAnimation = -1;
 
+        bool WeAreDragging = false;
+        Point DragStart = new Point(-1, -1);
+        Rectangle ChosenArea = new Rectangle(1,1,100,100);
+
         internal SpriteEntryForm(SpriteDatabase theDatabase, List<SpriteInfo> ListToWorkOn, Size GridSize)
         {
             InitializeComponent();
@@ -109,9 +113,15 @@ namespace SpriteLibrary
                 if (!TCTabPages.TabPages.Contains(tpMirrorRotate))
                     TCTabPages.TabPages.Add(tpMirrorRotate);
             }
+            UpdateChosenAreaLabel();
             ResumeLayout();
         }
 
+        private void UpdateChosenAreaLabel()
+        {
+            lblChosenArea.Text = ChosenArea.X + "," + ChosenArea.Y + "," + ChosenArea.Width + "," + ChosenArea.Height;
+        }
+
         private void SetUpEmptyInfo()
         {
             TempInformation = new SpriteInfo();
@@ -176,9 +186,63 @@ namespace SpriteLibrary
             }
         }
 
+        /// <summary>
+        /// Given two locations that we have clicked on, find the area we have selected
+        /// </summary>
+        /// <param name="Start"></param>
+        /// <param name="End"></param>
+        /// <returns></returns>
+        private Rectangle AreaFromGridPoints(Point Start, Point End)
+        {
+            //Get the points translated from locations on the picturebox
+            Point OneImagePoint = MyController.ReturnPointAdjustedForImage(Start);
+            Point TwoImagePoint = MyController.ReturnPointAdjustedForImage(End);
+            //Now, shrink them to figure out which grid points we have chosen
+            Point OneGridPoint = new Point(OneImagePoint.X / SnapGridSize.Width, OneImagePoint.Y / SnapGridSize.Height);
+            Point TwoGridPoint = new Point(TwoImagePoint.X / SnapGridSize.Width, TwoImagePoint.Y / SnapGridSize.Height);
+            //Find the top-left point and the bottom-right point
+            Point StartGridPoint = new Point(Math.Min(OneGridPoint.X, TwoGridPoint.X), Math.Min(OneGridPoint.Y, TwoGridPoint.Y));
+            Point EndGridPoint = new Point(Math.Max(OneGridPoint.X, TwoGridPoint.X), Math.Max(OneGridPoint.Y, TwoGridPoint.Y));
+            //Translate them back into points on the image
+            Point ReturnSPoint = new Point(StartGridPoint.X * SnapGridSize.Width, StartGridPoint.Y * SnapGridSize.Height);
+            Point ReturnEPoint = new Point((EndGridPoint.X +1) * SnapGridSize.Width, (EndGridPoint.Y +1) * SnapGridSize.Height);
+            //Change it into a rectangle and return it
+            Rectangle ReturnRec = new Rectangle(ReturnSPoint.X, ReturnSPoint.Y, ReturnEPoint.X - ReturnSPoint.X, ReturnEPoint.Y - ReturnSPoint.Y);
+            return ReturnRec;
+        }
+
         private void SpriteEntryForm_FormClosing(object sender, FormClosingEventArgs e)
         {
             myDatabase.Save(); //try saving the file
         }
+
+        private void pbImageField_MouseMove(object sender, MouseEventArgs e)
+        {
+            //If we are dragging, process the dragging
+            if (WeAreDragging)
+            {
+                ChosenArea = AreaFromGridPoints(DragStart, e.Location);
+                UpdateChosenAreaLabel();
+            }
+        }
+
+        private void pbImageField_MouseDown(object sender, MouseEventArgs e)
+        {
+            //When the mouse goes down, we note that we are trying to drag
+            WeAreDragging = true;
+            DragStart = e.Location;
+        }
+
+        private void pbImageField_MouseUp(object sender, MouseEventArgs e)
+        {
+            //When the mouse goes up, stop dragging and update
+            if(WeAreDragging)
+            {
+                ChosenArea = AreaFromGridPoints(DragStart, e.Location);
+                UpdateChosenAreaLabel();
+            }
+            WeAreDragging = false;
+
+        }
     }
 }