Fixed sampling not scaling with DPI. Also disabled implicit usings which is most of this commit.

Base/Base.csproj

@@ -5,7 +5,7 @@
     <TargetFramework>net8.0-windows</TargetFramework>
     <Nullable>enable</Nullable>
     <UseWindowsForms>true</UseWindowsForms>
-    <ImplicitUsings>enable</ImplicitUsings>
+    <ImplicitUsings>disable</ImplicitUsings>
     <RootNamespace>Graphing</RootNamespace>
     <AssemblyName>ThatOneNerd.Graphing</AssemblyName>
     <ProduceReferenceAssembly>True</ProduceReferenceAssembly>

Base/Base.csproj.user

@@ -20,4 +20,9 @@
       <SubType>Form</SubType>
     </Compile>
   </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Update="Forms\ViewCacheForm.resx">
+      <SubType>Designer</SubType>
+    </EmbeddedResource>
+  </ItemGroup>
 </Project>

Base/Float2.cs

@@ -1,4 +1,6 @@
-namespace Graphing;
+using System.Drawing;
+
+namespace Graphing;
 
 public record struct Float2
 {

Base/Forms/Controls/PieChart.Designer.cs

@@ -1,4 +1,6 @@
-namespace Graphing.Forms.Controls
+using System.Drawing;
+
+namespace Graphing.Forms.Controls
 {
     partial class PieChart
     {
@@ -33,7 +35,7 @@
             // PieChart
             // 
             AutoScaleDimensions = new SizeF(13F, 32F);
-            AutoScaleMode = AutoScaleMode.Font;
+            AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             Name = "PieChart";
             Size = new Size(500, 500);
             ResumeLayout(false);

Base/Forms/Controls/PieChart.cs

@@ -1,4 +1,8 @@
-using System.Drawing.Drawing2D;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Windows.Forms;
 
 namespace Graphing.Forms.Controls;
 

Base/Forms/GraphColorPickerForm.Designer.cs

@@ -1,4 +1,7 @@
-namespace Graphing.Forms
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Graphing.Forms
 {
     partial class GraphColorPickerForm
     {

Base/Forms/GraphColorPickerForm.cs

@@ -1,4 +1,8 @@
-namespace Graphing.Forms;
+using System;
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Graphing.Forms;
 
 public partial class GraphColorPickerForm : Form
 {

Base/Forms/GraphForm.Designer.cs

@@ -1,4 +1,7 @@
-namespace Graphing.Forms
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Graphing.Forms
 {
     partial class GraphForm
     {

Base/Forms/GraphForm.cs

@@ -1,6 +1,11 @@
 using Graphing.Graphables;
 using Graphing.Parts;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
 using System.Drawing.Drawing2D;
+using System.Linq;
+using System.Windows.Forms;
 
 namespace Graphing.Forms;
 

Base/Forms/SetZoomForm.Designer.cs

@@ -1,4 +1,7 @@
-namespace Graphing.Forms
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Graphing.Forms
 {
     partial class SetZoomForm
     {

Base/Forms/SetZoomForm.cs

@@ -1,4 +1,7 @@
-namespace Graphing.Forms;
+using System;
+using System.Windows.Forms;
+
+namespace Graphing.Forms;
 
 public partial class SetZoomForm : Form
 {

Base/Forms/ViewCacheForm.Designer.cs

@@ -1,4 +1,7 @@
-namespace Graphing.Forms
+using System.Drawing;
+using System.Windows.Forms;
+
+namespace Graphing.Forms
 {
     partial class ViewCacheForm
     {

Base/Forms/ViewCacheForm.cs

@@ -1,4 +1,8 @@
 using Graphing.Extensions;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Windows.Forms;
 
 namespace Graphing.Forms;
 

Base/Graphable.cs

@@ -1,4 +1,6 @@
 using Graphing.Forms;
+using System.Collections.Generic;
+using System.Drawing;
 
 namespace Graphing;
 

Base/Graphables/ColumnTable.cs

@@ -1,5 +1,8 @@
 using Graphing.Forms;
 using Graphing.Parts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
 
 namespace Graphing.Graphables;
 

Base/Graphables/Equation.cs

@@ -1,5 +1,7 @@
 using Graphing.Forms;
 using Graphing.Parts;
+using System;
+using System.Collections.Generic;
 
 namespace Graphing.Graphables;
 
@@ -22,15 +24,17 @@ public class Equation : Graphable
     public override IEnumerable<IGraphPart> GetItemsToRender(in GraphForm graph)
     {
         const int step = 10;
+
         double epsilon = Math.Abs(graph.ScreenSpaceToGraphSpace(new Int2(0, 0)).x
                                 - graph.ScreenSpaceToGraphSpace(new Int2(step / 2, 0)).x) / 5;
+        epsilon *= graph.DpiFloat / 192;
 
         List<IGraphPart> lines = [];
 
         double previousX = graph.MinVisibleGraph.x;
         double previousY = GetFromCache(previousX, epsilon);
 
-        for (int i = 1; i < graph.ClientRectangle.Width; i += step)
+        for (int i = 0; i < graph.ClientRectangle.Width + step; i += step)
         {
             double currentX = graph.ScreenSpaceToGraphSpace(new Int2(i, 0)).x;
             double currentY = GetFromCache(currentX, epsilon);

Base/Graphables/SlopeField.cs

@@ -1,5 +1,7 @@
 using Graphing.Forms;
 using Graphing.Parts;
+using System;
+using System.Collections.Generic;
 
 namespace Graphing.Graphables;
 

Base/Graphables/TangentLine.cs

@@ -1,5 +1,7 @@
 using Graphing.Forms;
 using Graphing.Parts;
+using System;
+using System.Collections.Generic;
 
 namespace Graphing.Graphables;
 

Base/IGraphPart.cs

@@ -1,4 +1,5 @@
 using Graphing.Forms;
+using System.Drawing;
 
 namespace Graphing;
 

Base/Int2.cs

@@ -1,4 +1,6 @@
-namespace Graphing;
+using System.Drawing;
+
+namespace Graphing;
 
 public record struct Int2
 {

Base/Parts/GraphLine.cs

@@ -1,4 +1,5 @@
 using Graphing.Forms;
+using System.Drawing;
 
 namespace Graphing.Parts;
 

Base/Parts/GraphRectangle.cs

@@ -1,4 +1,5 @@
 using Graphing.Forms;
+using System.Drawing;
 
 namespace Graphing.Parts;
 

Base/Parts/GraphUiCircle.cs

@@ -1,4 +1,5 @@
 using Graphing.Forms;
+using System.Drawing;
 
 namespace Graphing.Parts;
 

Testing/Program.cs

@@ -1,5 +1,7 @@
 using Graphing.Forms;
 using Graphing.Graphables;
+using System;
+using System.Windows.Forms;
 
 namespace Graphing.Testing;
 
@@ -14,10 +16,10 @@ internal static class Program
 
         GraphForm graph = new("One Of The Graphing Calculators Of All Time");
 
-        Equation possibleA = new(Math.Sin);
+        Equation equ = new(x => Math.Sin(x));
         SlopeField sf = new(2, (x, y) => Math.Cos(x));
-        TangentLine tl = new(2, 2, possibleA);
+        TangentLine tl = new(2, 2, equ);
-        graph.Graph(possibleA, sf, tl);
+        graph.Graph(equ, sf, tl);
 
         // You can preload graphs in by going Misc > Preload Cache.
         // Keep in mind this uses more memory than usual and can take

Testing/Testing.csproj

@@ -4,7 +4,7 @@
     <TargetFramework>net8.0-windows</TargetFramework>
     <Nullable>enable</Nullable>
     <UseWindowsForms>true</UseWindowsForms>
-    <ImplicitUsings>enable</ImplicitUsings>
+    <ImplicitUsings>disable</ImplicitUsings>
     <RootNamespace>Graphing.Testing</RootNamespace>
     <AssemblyName>ThatOneNerd.Graphing.Testing</AssemblyName>
   </PropertyGroup>