Added ColorExtensions.ToHsl and ColorHelper.FromHsl

CHANGELOG.md

@@ -16,7 +16,9 @@ Jump to version:
 
 ## 7.0.1 (In Development)
 
-No code changes
+### MLEM
+Additions
+- Added ColorExtensions.ToHsl and ColorHelper.FromHsl
 
 ## 7.0.0
 

MLEM/Graphics/ColorExtensions.cs

@@ -58,6 +58,39 @@ namespace MLEM.Graphics {
             return $"{(hash ? "#" : string.Empty)}{color.R:X2}{color.G:X2}{color.B:X2}";
         }
 
+        /// <summary>
+        /// Converts the given <paramref name="color"/> into HSL representation and returns the result as a value tuple with values between 0 and 1.
+        /// </summary>
+        /// <remarks>This code is adapted from https://gist.github.com/mjackson/5311256.</remarks>
+        /// <param name="color">The color to convert.</param>
+        /// <returns>The resulting HSL color as a value tuple containing H, S and L, each between 0 and 1.</returns>
+        public static (float H, float S, float L) ToHsl(this Color color) {
+            var r = color.R / 255F;
+            var g = color.G / 255F;
+            var b = color.B / 255F;
+
+            var max = Math.Max(Math.Max(r, g), b);
+            var min = Math.Min(Math.Min(r, g), b);
+            float h, s, l = (max + min) / 2;
+
+            if (max == min) {
+                h = s = 0; // achromatic
+            } else {
+                var d = max - min;
+                s = l > 0.5F ? d / (2 - max - min) : d / (max + min);
+                if (r == max) {
+                    h = (g - b) / d + (g < b ? 6 : 0);
+                } else if (g == max) {
+                    h = (b - r) / d + 2;
+                } else {
+                    h = (r - g) / d + 4;
+                }
+                h /= 6;
+            }
+
+            return (h, s, l);
+        }
+
     }
 
     /// <summary>
@@ -116,5 +149,54 @@ namespace MLEM.Graphics {
             return false;
         }
 
+        /// <summary>
+        ///Converts the given HSL color to an RGB <see cref="Color"/> and returns the result.
+        /// </summary>
+        /// <remarks>This code is adapted from https://gist.github.com/mjackson/5311256.</remarks>
+        /// <param name="color">The HSL color to convert, as a value tuple that contains H, S and L values, each between 0 and 1.</param>
+        /// <returns>The resulting RGB color.</returns>
+        public static Color FromHsl((float H, float S, float L) color) {
+            return ColorHelper.FromHsl(color.H, color.S, color.L);
+        }
+
+        /// <summary>
+        ///Converts the given HSL values to an RGB <see cref="Color"/> and returns the result.
+        /// </summary>
+        /// <remarks>This code is adapted from https://gist.github.com/mjackson/5311256.</remarks>
+        /// <param name="h">The H component of the HSL color, between 0 and 1.</param>
+        /// <param name="s">The S component of the HSL color, between 0 and 1.</param>
+        /// <param name="l">The L component of the HSL color, between 0 and 1.</param>
+        /// <returns>The resulting RGB color.</returns>
+        public static Color FromHsl(float h, float s, float l) {
+            float r, g, b;
+
+            if (s == 0) {
+                r = g = b = l; // achromatic
+            } else {
+                var q = l < 0.5F ? l * (1 + s) : l + s - l * s;
+                var p = 2 * l - q;
+
+                r = ColorHelper.HueToRgb(p, q, h + 1 / 3F);
+                g = ColorHelper.HueToRgb(p, q, h);
+                b = ColorHelper.HueToRgb(p, q, h - 1 / 3F);
+            }
+
+            return new Color(r, g, b);
+        }
+
+        private static float HueToRgb(float p, float q, float t) {
+            if (t < 0)
+                t += 1;
+            if (t > 1)
+                t -= 1;
+            if (t < 1 / 6F)
+                return p + (q - p) * 6 * t;
+            if (t < 1 / 2F)
+                return q;
+            if (t < 2 / 3F)
+                return p + (q - p) * (2 / 3F - t) * 6;
+            return p;
+        }
+
     }
 }

Sandbox/GameImpl.cs

@@ -19,6 +19,7 @@ using MLEM.Textures;
 using MLEM.Ui;
 using MLEM.Ui.Elements;
 using MLEM.Ui.Style;
+using Group = MLEM.Ui.Elements.Group;
 
 namespace Sandbox;
 
@@ -87,6 +88,7 @@ public class GameImpl : MlemGame {
             this.SpriteBatch.End();
         };*/
 
+        /*
         var panel = new Panel(Anchor.Center, new Vector2(0, 100), Vector2.Zero) {SetWidthBasedOnChildren = true};
         panel.AddChild(new Button(Anchor.AutoLeft, new Vector2(100, 10)));
         panel.AddChild(new Button(Anchor.AutoCenter, new Vector2(80, 10)));
@@ -112,17 +114,21 @@ public class GameImpl : MlemGame {
             var dir = vec.ToDirection();
             Console.WriteLine(vec + " -> " + dir);
         }
+        */
 
+        /*
         var writer = new StringWriter();
-        this.Content.GetJsonSerializer().Serialize(writer, obj);
+        this.Content.GetJsonSerializer().Serialize(writer, obj);*/
         //Console.WriteLine(writer.ToString());
         // {"Vec":"10 20","Point":"20 30","Rectangle":"1 2 3 4","RectangleF":"4 5 6 7"}
 
         // Also:
         //this.Content.AddJsonConverter(new CustomConverter());
 
+        /*
         var res = this.Content.LoadJson<Test>("Test");
         Console.WriteLine("The res is " + res);
+        */
 
         //var gradient = this.SpriteBatch.GenerateGradientTexture(Color.Green, Color.Red, Color.Blue, Color.Yellow);
         /*this.OnDraw += (game, time) => {
@@ -139,6 +145,7 @@ public class GameImpl : MlemGame {
             this.SpriteBatch.End();
         };*/
 
+        /*
         var sc = 2;
         var formatter = new TextFormatter();
         formatter.AddImage("Test", new TextureRegion(tex, 0, 8, 24, 24));
@@ -185,6 +192,7 @@ public class GameImpl : MlemGame {
             }
             this.tokenized.Update(time);
         };
+        */
 
         /*var testPanel = new Panel(Anchor.Center, new Vector2(0.5F, 100), Vector2.Zero);
         testPanel.AddChild(new Button(Anchor.AutoLeft, new Vector2(0.25F, -1)));
@@ -225,6 +233,7 @@ public class GameImpl : MlemGame {
         par.OnDrawn = (e, time, batch, a) => batch.DrawRectangle(e.DisplayArea.ToExtended(), Color.Red);
         this.UiSystem.Add("Load", loadGroup);*/
 
+        /*
         var spillPanel = new Panel(Anchor.Center, new Vector2(100), Vector2.Zero);
         var squishingGroup = spillPanel.AddChild(new SquishingGroup(Anchor.TopLeft, Vector2.One));
         squishingGroup.AddChild(new Button(Anchor.TopLeft, new Vector2(30), "TL") {
@@ -293,6 +302,7 @@ public class GameImpl : MlemGame {
             }
             this.SpriteBatch.End();
         };
+        */
 
         /*var viewport = new BoxingViewportAdapter(this.Window, this.GraphicsDevice, 1280, 720);
         var newPanel = new Panel(Anchor.TopLeft, new Vector2(200, 100), new Vector2(10, 10));
@@ -387,6 +397,28 @@ public class GameImpl : MlemGame {
         Console.WriteLine("MouseButtons: " + string.Join(", ", GenericInput.AllMouseButtons));
         Console.WriteLine("Buttons: " + string.Join(", ", GenericInput.AllButtons));
         Console.WriteLine("Inputs: " + string.Join(", ", GenericInput.AllInputs));*/
+
+        var hsl = new Panel(Anchor.Center, new Vector2(100), true);
+        var color = Color.Pink.ToHsl();
+        hsl.AddChild(new Paragraph(Anchor.AutoLeft, 1, "H"));
+        hsl.AddChild(new Slider(Anchor.AutoLeft, new Vector2(1, 10), 5, 1) {
+            CurrentValue = color.H,
+            OnValueChanged = (_, v) => color.H = v
+        });
+        hsl.AddChild(new Paragraph(Anchor.AutoLeft, 1, "S"));
+        hsl.AddChild(new Slider(Anchor.AutoLeft, new Vector2(1, 10), 5, 1) {
+            CurrentValue = color.S,
+            OnValueChanged = (_, v) => color.S = v
+        });
+        hsl.AddChild(new Paragraph(Anchor.AutoLeft, 1, "L"));
+        hsl.AddChild(new Slider(Anchor.AutoLeft, new Vector2(1, 10), 5, 1) {
+            CurrentValue = color.L,
+            OnValueChanged = (_, v) => color.L = v
+        });
+        hsl.AddChild(new Group(Anchor.AutoLeft, new Vector2(1, 40), false) {
+            OnDrawn = (e, _, batch, _, _) => batch.Draw(batch.GetBlankTexture(), e.DisplayArea, ColorHelper.FromHsl(color))
+        });
+        this.UiSystem.Add("HSL", hsl);
     }
 
     protected override void DoUpdate(GameTime gameTime) {