Dynamic line thickness.

Base/Forms/Controls/PieChart.cs

@@ -6,12 +6,18 @@ public partial class PieChart : UserControl
 {
     public List<(Color, double)> Values { get; set; }
 
+    public float DpiFloat { get; private set; }
+
     public PieChart()
     {
         SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
         SetStyle(ControlStyles.AllPaintingInWmPaint, true);
         SetStyle(ControlStyles.UserPaint, true);
 
+        Graphics tempG = CreateGraphics();
+        DpiFloat = (tempG.DpiX + tempG.DpiY) / 2;
+        tempG.Dispose();
+
         Values = [];
         InitializeComponent();
     }
@@ -41,7 +47,7 @@ public partial class PieChart : UserControl
         }
 
         // Draw the outline.
-        Pen outlinePartsPen = new(Color.FromArgb(unchecked((int)0xFF_202020)), 3);
+        Pen outlinePartsPen = new(Color.FromArgb(unchecked((int)0xFF_202020)), DpiFloat * 3 / 192);
         current = 0;
         foreach ((Color, double value) item in Values)
         {
@@ -53,7 +59,7 @@ public partial class PieChart : UserControl
         }
 
         // Outline
-        Pen outlinePen = new(Color.FromArgb(unchecked((int)0xFF_202020)), 5);
+        Pen outlinePen = new(Color.FromArgb(unchecked((int)0xFF_202020)), DpiFloat * 5 / 192);
         g.DrawEllipse(outlinePen, rect);
     }
 }

Base/Forms/GraphColorPickerForm.cs

@@ -37,7 +37,7 @@ public partial class GraphColorPickerForm : Form
         MessageLabel.Text = $"Pick a color for {able.Name}.";
 
         // Add preset buttons.
-        const int size = 48;
+        int size = (int)(graph.DpiFloat * 48 / 192);
         int position = 0;
         foreach (uint cId in Graphable.DefaultColors)
         {

Base/Forms/GraphForm.cs

@@ -14,6 +14,8 @@ public partial class GraphForm : Form
     public Float2 ScreenCenter { get; private set; }
     public Float2 Dpi { get; private set; }
 
+    public float DpiFloat { get; private set; }
+
     public double ZoomLevel
     {
         get => _zoomLevel;
@@ -57,6 +59,9 @@ public partial class GraphForm : Form
         Graphics tempG = CreateGraphics();
         Dpi = new(tempG.DpiX, tempG.DpiY);
         tempG.Dispose();
+
+        DpiFloat = (float)((Dpi.x + Dpi.y) / 2);
+
         ables = [];
         ZoomLevel = 1;
         initialWindowPos = Location;
@@ -102,7 +107,7 @@ public partial class GraphForm : Form
 
         // Draw horizontal/vertical quarter-axis.
         Brush quarterBrush = new SolidBrush(QuarterAxisColor);
-        Pen quarterPen = new(quarterBrush, 2);
+        Pen quarterPen = new(quarterBrush, DpiFloat * 2 / 192);
 
         for (double x = Math.Ceiling(MinVisibleGraph.x * 4 / axisScale) * axisScale / 4; x <= Math.Floor(MaxVisibleGraph.x * 4 / axisScale) * axisScale / 4; x += axisScale / 4)
         {
@@ -119,7 +124,7 @@ public partial class GraphForm : Form
 
         // Draw horizontal/vertical semi-axis.
         Brush semiBrush = new SolidBrush(SemiAxisColor);
-        Pen semiPen = new(semiBrush, 2);
+        Pen semiPen = new(semiBrush, DpiFloat * 2 / 192);
 
         for (double x = Math.Ceiling(MinVisibleGraph.x / axisScale) * axisScale; x <= Math.Floor(MaxVisibleGraph.x / axisScale) * axisScale; x += axisScale)
         {
@@ -135,7 +140,7 @@ public partial class GraphForm : Form
         }
 
         Brush mainLineBrush = new SolidBrush(MainAxisColor);
-        Pen mainLinePen = new(mainLineBrush, 3);
+        Pen mainLinePen = new(mainLineBrush, DpiFloat * 3 / 192);
 
         // Draw the main axis (on top of the semi axis).
         Int2 startCenterY = GraphSpaceToScreenSpace(new Float2(0, MinVisibleGraph.y)),
@@ -162,7 +167,8 @@ public partial class GraphForm : Form
         {
             IEnumerable<IGraphPart> lines = ables[i].GetItemsToRender(this);
             Brush graphBrush = new SolidBrush(ables[i].Color);
-            foreach (IGraphPart gp in lines) gp.Render(this, g, graphBrush);
+            Pen graphPen = new(graphBrush, DpiFloat * 3 / 192);
+            foreach (IGraphPart gp in lines) gp.Render(this, g, graphPen);
         }
 
         base.OnPaint(e);

Base/Forms/ViewCacheForm.cs

@@ -32,6 +32,10 @@ public partial class ViewCacheForm : Form
             CachePie.Values.Add((able.Color, thisBytes));
             totalBytes += thisBytes;
 
+            int buttonHeight = (int)(refForm.DpiFloat * 46 / 192),
+                buttonWidth = (int)(refForm.DpiFloat * 92 / 192),
+                buttonSpaced = (int)(refForm.DpiFloat * 98 / 192);
+
             if (index < labelCache.Count)
             {
                 Label reuseLabel = labelCache[index];
@@ -45,9 +49,9 @@ public partial class ViewCacheForm : Form
                     Anchor = AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Right,
                     AutoEllipsis = true,
                     ForeColor = able.Color,
-                    Location = new Point(0, labelCache.Count * 46),
+                    Location = new Point(0, labelCache.Count * buttonHeight),
                     Parent = SpecificCachePanel,
-                    Size = new Size(SpecificCachePanel.Width - 98, 46),
+                    Size = new Size(SpecificCachePanel.Width - buttonSpaced, buttonHeight),
                     Text = $"{able.Name}: {thisBytes.FormatAsBytes()}",
                     TextAlign = ContentAlignment.MiddleLeft,
                 };
@@ -59,9 +63,9 @@ public partial class ViewCacheForm : Form
                 Button newButton = new()
                 {
                     Anchor = AnchorStyles.Top | AnchorStyles.Right,
-                    Location = new Point(SpecificCachePanel.Width - 92, buttonCache.Count * 46),
+                    Location = new Point(SpecificCachePanel.Width - buttonWidth, buttonCache.Count * buttonHeight),
                     Parent = SpecificCachePanel,
-                    Size = new Size(92, 46),
+                    Size = new Size(buttonWidth, buttonHeight),
                     Text = "Clear"
                 };
                 newButton.Click += (o, e) => EraseSpecificGraphable_Click(able);

Base/IGraphPart.cs

@@ -4,5 +4,5 @@ namespace Graphing;
 
 public interface IGraphPart
 {
-    public void Render(in GraphForm form, in Graphics g, in Brush brush);
+    public void Render(in GraphForm form, in Graphics g, in Pen pen);
 }

Base/Parts/GraphLine.cs

@@ -18,15 +18,13 @@ public record struct GraphLine : IGraphPart
         this.b = b;
     }
 
-    public readonly void Render(in GraphForm form, in Graphics g, in Brush brush)
+    public readonly void Render(in GraphForm form, in Graphics g, in Pen pen)
     {
         if (!double.IsFinite(a.x) || !double.IsFinite(a.y) ||
             !double.IsFinite(b.x) || !double.IsFinite(b.y)) return;
 
         Int2 start = form.GraphSpaceToScreenSpace(a),
              end = form.GraphSpaceToScreenSpace(b);
-
-        Pen pen = new(brush, 3);
         g.DrawLine(pen, start, end);
     }
 }

Base/Parts/GraphRectangle.cs

@@ -25,7 +25,7 @@ public record struct GraphRectangle : IGraphPart
         max = max
     };
 
-    public void Render(in GraphForm form, in Graphics g, in Brush brush)
+    public void Render(in GraphForm form, in Graphics g, in Pen pen)
     {
         if (!double.IsFinite(max.x) || !double.IsFinite(max.y) ||
             !double.IsFinite(min.x) || !double.IsFinite(min.y)) return;
@@ -40,6 +40,6 @@ public record struct GraphRectangle : IGraphPart
                         start.y - end.y);
 
         if (size.x == 0 || size.y == 0) return;
-        g.FillRectangle(brush, new Rectangle(start.x, end.y, size.x, size.y));
+        g.FillRectangle(pen.Brush, new Rectangle(start.x, end.y, size.x, size.y));
     }
 }

Base/Parts/GraphUiCircle.cs

@@ -18,14 +18,14 @@ public record struct GraphUiCircle : IGraphPart
         this.radius = radius;
     }
 
-    public readonly void Render(in GraphForm form, in Graphics g, in Brush brush)
+    public readonly void Render(in GraphForm form, in Graphics g, in Pen pen)
     {
         if (!double.IsFinite(center.x) || !double.IsFinite(center.y) ||
             !double.IsFinite(radius) || radius == 0) return;
 
         Int2 centerPix = form.GraphSpaceToScreenSpace(center);
-        g.FillEllipse(brush, new Rectangle(new Point(centerPix.x - radius,
+        g.FillEllipse(pen.Brush, new Rectangle(new Point(centerPix.x - radius,
-                                                     centerPix.y - radius),
+                                                         centerPix.y - radius),
                                             new Size(radius * 2, radius * 2)));
     }
 }

Testing/Program.cs

@@ -10,28 +10,14 @@ internal static class Program
     {
         Application.EnableVisualStyles();
         Application.SetCompatibleTextRenderingDefault(false);
-        Application.SetHighDpiMode(HighDpiMode.SystemAware);
+        Application.SetHighDpiMode(HighDpiMode.PerMonitorV2);
 
         GraphForm graph = new("One Of The Graphing Calculators Of All Time");
 
-        Equation equ1 = new(x =>
+        Equation equ1 = new(x => -x * x + 2);
-        {
-            // Demonstrate the caching abilities of the software.
-            // This extra waiting is done every time the form requires a
-            // calculation done. At the start, it'll be laggy, but as you
-            // move around and zoom in, more pieces are cached, and when
-            // you reset, the viewport will be a lot less laggy.
-
-            // Remove this loop to make the equation fast again. I didn't
-            // slow the engine down much more with this improvement, so any
-            // speed decrease you might notice is likely this function.
-            for (int i = 0; i < 1_000_000; i++) ;
-            return -x * x + 2;
-        });
         Equation equ2 = new(x => x);
         Equation equ3 = new(x => -Math.Sqrt(x));
-        SlopeField sf = new(2, (x, y) => (x * x - y * y) / x);
+        graph.Graph(equ1, equ2, equ3);
-        graph.Graph(equ1, equ2, equ3, sf);
 
         // You can also now view and reset caches in the UI by going to
         // Misc > View Caches.