Slope field works with decimals now.

Base/Forms/GraphForm.Designer.cs

@@ -72,7 +72,7 @@ namespace Graphing.Forms
             GraphMenu.Items.AddRange(new ToolStripItem[] { MenuViewport, MenuElements, MenuOperations, MenuConvert, MenuMisc });
             GraphMenu.Location = new Point(0, 0);
             GraphMenu.Name = "GraphMenu";
-            GraphMenu.Size = new Size(1449, 40);
+            GraphMenu.Size = new Size(1449, 42);
             GraphMenu.TabIndex = 1;
             GraphMenu.Text = "menuStrip1";
             // 
@@ -80,7 +80,7 @@ namespace Graphing.Forms
             // 
             MenuViewport.DropDownItems.AddRange(new ToolStripItem[] { ButtonViewportSetZoom, ButtonViewportSetCenter, ButtonViewportReset, ButtonViewportResetWindow });
             MenuViewport.Name = "MenuViewport";
-            MenuViewport.Size = new Size(129, 36);
+            MenuViewport.Size = new Size(129, 38);
             MenuViewport.Text = "Viewport";
             // 
             // ButtonViewportSetZoom
@@ -115,7 +115,7 @@ namespace Graphing.Forms
             // 
             MenuElements.DropDownItems.AddRange(new ToolStripItem[] { MenuElementsColors, MenuElementsRemove });
             MenuElements.Name = "MenuElements";
-            MenuElements.Size = new Size(131, 36);
+            MenuElements.Size = new Size(131, 38);
             MenuElements.Text = "Elements";
             // 
             // MenuElementsColors
@@ -134,7 +134,7 @@ namespace Graphing.Forms
             // 
             MenuOperations.DropDownItems.AddRange(new ToolStripItem[] { MenuOperationsDerivative, MenuOperationsIntegral, MenuOperationsTranslate });
             MenuOperations.Name = "MenuOperations";
-            MenuOperations.Size = new Size(151, 36);
+            MenuOperations.Size = new Size(151, 38);
             MenuOperations.Text = "Operations";
             // 
             // MenuOperationsDerivative
@@ -159,26 +159,26 @@ namespace Graphing.Forms
             // 
             MenuConvert.DropDownItems.AddRange(new ToolStripItem[] { MenuConvertEquation, MenuConvertSlopeField });
             MenuConvert.Name = "MenuConvert";
-            MenuConvert.Size = new Size(118, 36);
+            MenuConvert.Size = new Size(118, 38);
             MenuConvert.Text = "Convert";
             // 
             // MenuConvertEquation
             // 
             MenuConvertEquation.Name = "MenuConvertEquation";
-            MenuConvertEquation.Size = new Size(297, 44);
+            MenuConvertEquation.Size = new Size(359, 44);
             MenuConvertEquation.Text = "To Equation";
             // 
             // MenuConvertSlopeField
             // 
             MenuConvertSlopeField.Name = "MenuConvertSlopeField";
-            MenuConvertSlopeField.Size = new Size(297, 44);
+            MenuConvertSlopeField.Size = new Size(359, 44);
             MenuConvertSlopeField.Text = "To Slope Field";
             // 
             // MenuMisc
             // 
             MenuMisc.DropDownItems.AddRange(new ToolStripItem[] { MenuMiscCaches, MiscMenuPreload });
             MenuMisc.Name = "MenuMisc";
-            MenuMisc.Size = new Size(83, 36);
+            MenuMisc.Size = new Size(83, 38);
             MenuMisc.Text = "Misc";
             // 
             // MenuMiscCaches

Base/Graphables/SlopeField.cs

@@ -11,11 +11,11 @@ public class SlopeField : Graphable
     private static int slopeFieldNum;
 
     protected readonly SlopeFieldsDelegate equ;
-    protected readonly int detail;
+    protected readonly double detail;
 
     protected readonly List<(Float2, GraphLine)> cache;
 
-    public SlopeField(int detail, SlopeFieldsDelegate equ)
+    public SlopeField(double detail, SlopeFieldsDelegate equ)
     {
         slopeFieldNum++;
         Name = $"Slope Field {slopeFieldNum}";
@@ -27,12 +27,18 @@ public class SlopeField : Graphable
 
     public override IEnumerable<IGraphPart> GetItemsToRender(in GraphForm graph)
     {
-        double epsilon = 1 / (detail * 2.0);
+        double step = 1 / detail;
+        double epsilon = step * 0.5;
         List<IGraphPart> lines = [];
 
-        for (double x = Math.Ceiling(graph.MinVisibleGraph.x - 1); x < graph.MaxVisibleGraph.x + 1; x += 1.0 / detail)
+        double minX = Math.Round((graph.MinVisibleGraph.x - 1) / step) * step,
+               maxX = Math.Round((graph.MaxVisibleGraph.x + 1) / step) * step,
+               minY = Math.Round((graph.MinVisibleGraph.y - 1) / step) * step,
+               maxY = Math.Round((graph.MaxVisibleGraph.y + 1) / step) * step;
+
+        for (double x = minX; x < maxX; x += step)
         {
-            for (double y = Math.Ceiling(graph.MinVisibleGraph.y - 1); y < graph.MaxVisibleGraph.y + 1; y += 1.0 / detail)
+            for (double y = minY; y < maxY; y += step)
             {
                 lines.Add(GetFromCache(epsilon, x, y));
             }

Testing/Program.cs

@@ -16,12 +16,15 @@ internal static class Program
         
         GraphForm graph = new("One Of The Graphing Calculators Of All Time");
 
-        Equation equA = new(Math.Sin),
+        /*Equation equA = new(Math.Sin),
                  equB = new(Math.Cos);
         EquationDifference diff = new(2, equA, equB);
         ParametricEquation equC = new(0, 20, t => 0.0375 * t * Math.Cos(t), t => 0.0625 * t * Math.Sin(t) + 3);
         TangentLine tanA = new(2, 2, equA);
-        graph.Graph(equA, equB, diff, equC, equB.ToColumnTable(-3, 3, 2), tanA);
+        graph.Graph(equA, equB, diff, equC, equB.ToColumnTable(-3, 3, 2), tanA);*/
+
+        SlopeField sf1 = new(1.5, (x, y) => Math.Cos(x) + Math.Sin(y));
+        graph.Graph(sf1);
 
         Application.Run(graph);
     }