Zoom form finally pretty much ready.

Base/Forms/GraphForm.cs

@@ -35,6 +35,8 @@ public partial class GraphForm : Form
         {
             _zoomLevel = new(Math.Clamp(value.x, 1e-5, 1e3),
                              Math.Clamp(value.y, 1e-5, 1e3));
+            OnZoomLevelChanged(this, new());
+            Invalidate(false);
         }
     }
     private Float2 _zoomLevel;
@@ -49,6 +51,8 @@ public partial class GraphForm : Form
 
     private readonly List<Graphable> ables;
 
+    public event EventHandler OnZoomLevelChanged = delegate { };
+
     public GraphForm(string title)
     {
         SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
@@ -390,9 +394,7 @@ public partial class GraphForm : Form
 
     private void ResetViewportButton_Click(object? sender, EventArgs e)
     {
-        ScreenCenter = new Float2(0, 0);
+        ResetAllViewport();
-        ZoomLevel = new(1, 1);
-        Invalidate(false);
     }
     private void GraphColorPickerButton_Click(Graphable able)
     {
@@ -549,6 +551,16 @@ public partial class GraphForm : Form
         WindowState = FormWindowState.Normal;
     }
 
+    public void ResetAllViewport()
+    {
+        ScreenCenter = new Float2(0, 0);
+        ZoomLevel = new(1, 1);
+        Location = initialWindowPos;
+        Size = initialWindowSize;
+        WindowState = FormWindowState.Normal;
+        Invalidate(false);
+    }
+
     private ViewCacheForm? cacheForm;
     private void MenuMiscCaches_Click(object? sender, EventArgs e)
     {

Base/Forms/SetZoomForm.Designer.cs

@@ -29,6 +29,9 @@
         private void InitializeComponent()
         {
             EnableBoxSelect = new System.Windows.Forms.Button();
+            MatchAspectButton = new System.Windows.Forms.Button();
+            ResetButton = new System.Windows.Forms.Button();
+            NormalizeButton = new System.Windows.Forms.Button();
             SuspendLayout();
             // 
             // EnableBoxSelect
@@ -41,11 +44,44 @@
             EnableBoxSelect.UseVisualStyleBackColor = true;
             EnableBoxSelect.Click += EnableBoxSelect_Click;
             // 
+            // MatchAspectButton
+            // 
+            MatchAspectButton.Location = new System.Drawing.Point(168, 12);
+            MatchAspectButton.Name = "MatchAspectButton";
+            MatchAspectButton.Size = new System.Drawing.Size(187, 46);
+            MatchAspectButton.TabIndex = 1;
+            MatchAspectButton.Text = "Match Aspect";
+            MatchAspectButton.UseVisualStyleBackColor = true;
+            MatchAspectButton.Click += MatchAspectButton_Click;
+            // 
+            // ResetButton
+            // 
+            ResetButton.Location = new System.Drawing.Point(517, 12);
+            ResetButton.Name = "ResetButton";
+            ResetButton.Size = new System.Drawing.Size(150, 46);
+            ResetButton.TabIndex = 2;
+            ResetButton.Text = "Reset";
+            ResetButton.UseVisualStyleBackColor = true;
+            ResetButton.Click += ResetButton_Click;
+            // 
+            // NormalizeButton
+            // 
+            NormalizeButton.Location = new System.Drawing.Point(361, 12);
+            NormalizeButton.Name = "NormalizeButton";
+            NormalizeButton.Size = new System.Drawing.Size(150, 46);
+            NormalizeButton.TabIndex = 3;
+            NormalizeButton.Text = "Normalize";
+            NormalizeButton.UseVisualStyleBackColor = true;
+            NormalizeButton.Click += NormalizeButton_Click;
+            // 
             // SetZoomForm
             // 
             AutoScaleDimensions = new System.Drawing.SizeF(13F, 32F);
             AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             ClientSize = new System.Drawing.Size(800, 450);
+            Controls.Add(NormalizeButton);
+            Controls.Add(ResetButton);
+            Controls.Add(MatchAspectButton);
             Controls.Add(EnableBoxSelect);
             FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
             Name = "SetZoomForm";
@@ -56,5 +92,8 @@
         #endregion
 
         private System.Windows.Forms.Button EnableBoxSelect;
+        private System.Windows.Forms.Button MatchAspectButton;
+        private System.Windows.Forms.Button ResetButton;
+        private System.Windows.Forms.Button NormalizeButton;
     }
 }

Base/Forms/SetZoomForm.cs

@@ -13,6 +13,8 @@ public partial class SetZoomForm : Form
     {
         InitializeComponent();
         this.refForm = refForm;
+
+        refForm.OnZoomLevelChanged += (o, e) => RedeclareValues();
     }
 
     private void EnableBoxSelect_Click(object? sender, EventArgs e)
@@ -30,9 +32,46 @@ public partial class SetZoomForm : Form
             EnableBoxSelect.Text = "Box Select";
         }
     }
+    private void MatchAspectButton_Click(object? sender, EventArgs e)
+    {
+        double zoomXFactor = refForm.ZoomLevel.x / refForm.ZoomLevel.y;
+        double actualXFactor = refForm.ClientRectangle.Width / refForm.ClientRectangle.Height;
+
+        double diff = actualXFactor / zoomXFactor;
+        int newWidth = (int)(refForm.Width / diff);
+        refForm.ZoomLevel = new(refForm.ZoomLevel.x * diff, refForm.ZoomLevel.y);
+
+        int maxScreenWidth = Screen.FromControl(refForm).WorkingArea.Width;
+        if (newWidth >= maxScreenWidth)
+        {
+            refForm.Location = new(0, refForm.Location.Y);
+
+            double xScaleFactor = (double)maxScreenWidth / newWidth;
+            newWidth = maxScreenWidth;
+            refForm.Height = (int)(refForm.Height * xScaleFactor);
+            refForm.ZoomLevel = new(refForm.ZoomLevel.x * xScaleFactor, refForm.ZoomLevel.y * xScaleFactor);
+        }
+
+        refForm.Width = newWidth;
+    }
+    private void ResetButton_Click(object? sender, EventArgs e)
+    {
+        refForm.ResetAllViewport();
+    }
+
+    private void RedeclareValues()
+    {
+        Invalidate(false);
+    }
 
     internal void CompleteBoxSelection()
     {
         if (boxSelectEnabled) EnableBoxSelect_Click(null, new());
     }
+
+    private void NormalizeButton_Click(object sender, EventArgs e)
+    {
+        double factor = 1 / Math.Min(refForm.ZoomLevel.x, refForm.ZoomLevel.y);
+        refForm.ZoomLevel = new(factor * refForm.ZoomLevel.x, factor * refForm.ZoomLevel.y);
+    }
 }