[orx-fx] Add Canny edge detector

orx-fx/src/commonMain/kotlin/edges/CannyEdgeDetector.kt

@@ -0,0 +1,48 @@
+package org.openrndr.extra.fx.edges
+
+import org.openrndr.color.ColorRGBa
+import org.openrndr.draw.Filter
+import org.openrndr.draw.filterShaderFromCode
+import org.openrndr.extra.fx.fx_canny_edge_detector
+import org.openrndr.extra.parameters.ColorParameter
+import org.openrndr.extra.parameters.Description
+import org.openrndr.extra.parameters.DoubleParameter
+
+@Description("Canny Edge Detector")
+class CannyEdgeDetector : Filter(
+    filterShaderFromCode(fx_canny_edge_detector, "canny-edge-detector")
+) {
+
+    @DoubleParameter("threshold 0", 0.0, 100.0, order = 0)
+    var threshold0: Double by parameters
+
+    @DoubleParameter("threshold 1", 0.0, 100.0, order = 1)
+    var threshold1: Double by parameters
+
+    @DoubleParameter("thickness", 0.0, 10.0, order = 2)
+    var thickness: Double by parameters
+
+    @ColorParameter("foreground color", order = 3)
+    var foregroundColor: ColorRGBa by parameters
+
+    @DoubleParameter("foreground opacity", 0.0, 1.0, order = 4)
+    var foregroundOpacity: Double by parameters
+
+    @ColorParameter("background color", order = 5)
+    var backgroundColor: ColorRGBa by parameters
+
+    @DoubleParameter("background opacity", 0.0, 1.0, order = 6)
+    var backgroundOpacity: Double by parameters
+
+
+    init {
+        threshold0 = 2.0
+        threshold1 = 0.0
+        thickness = 1.0
+        foregroundColor = ColorRGBa.WHITE
+        backgroundColor = ColorRGBa.BLACK
+        backgroundOpacity = 1.0
+        foregroundOpacity = 1.0
+    }
+
+}