[orx-shade-styles] Revise level quantization

orx-shade-styles/src/commonMain/kotlin/fills/gradients/GradientBase.kt

@@ -104,8 +104,8 @@ open class GradientBase<C>(
                     
                     if (p_quantization != 0) {
                         f *= float(p_quantization);
-                        f = floor(f + 0.5);
+                        f = floor(f);
-                        f /= float(p_quantization);
+                        f /= float(p_quantization) - 1.0;
                     }
                     
                     float sf;

orx-shade-styles/src/jvmDemo/kotlin/gradients/DemoGradient07.kt

@@ -0,0 +1,48 @@
+package gradients
+
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.loadFont
+import org.openrndr.extra.camera.Camera2D
+import org.openrndr.extra.color.presets.BLUE_STEEL
+import org.openrndr.extra.shadestyles.fills.FillFit
+import org.openrndr.extra.shadestyles.fills.FillUnits
+import org.openrndr.extra.shadestyles.fills.SpreadMethod
+import org.openrndr.extra.shadestyles.fills.gradients.gradient
+import org.openrndr.extra.shapes.primitives.grid
+import org.openrndr.math.Vector2
+import kotlin.math.PI
+import kotlin.math.cos
+import kotlin.math.sin
+
+fun main() = application {
+    configure {
+        width = 720
+        height = 720
+    }
+    program {
+        extend(Camera2D())
+        extend {
+            val grid = drawer.bounds.grid(48, 1)
+            drawer.stroke = null
+
+            for ((index, cell) in grid.flatten().withIndex()) {
+                drawer.shadeStyle = gradient<ColorRGBa> {
+                    quantization = index + 2
+                    stops[0.0] = ColorRGBa.WHITE
+                    stops[ (quantization) / (quantization+1.0)] = ColorRGBa.BLACK
+
+                    fillUnits = FillUnits.BOUNDS
+                    fillFit = FillFit.COVER
+                    spreadMethod = SpreadMethod.PAD
+
+                    linear {
+                        start = Vector2(0.5, 0.0)
+                        end = Vector2(0.5, 1.0)
+                    }
+                }
+                drawer.rectangle(cell)
+            }
+        }
+    }
+}