Add AntialiasSVGSample.

Author: Yuncong Zhang

Samples/UIWidgetSample/AntialiasSVGSample.cs

@@ -0,0 +1,146 @@
+using System.Collections.Generic;
+using Unity.UIWidgets.engine;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using Canvas = Unity.UIWidgets.ui.Canvas;
+using Color = Unity.UIWidgets.ui.Color;
+using Gradient = Unity.UIWidgets.ui.Gradient;
+using Image = Unity.UIWidgets.ui.Image;
+using UIWidgetRect = Unity.UIWidgets.ui.Rect;
+
+
+public class AntialiasSVGSample : UIWidgetsPanel {
+    protected override void OnEnable() {
+        FontManager.instance.addFont(Resources.Load<Font>("MaterialIcons-Regular"), "Material Icons");
+        FontManager.instance.addFont(Resources.Load<Font>("GalleryIcons"), "GalleryIcons");
+
+        base.OnEnable();
+    }
+
+    protected override Widget createWidget() {
+        Debug.Log("[SVG Testbed Panel Created]");
+
+        return new SVGTestbedPanelWidget();
+    }
+}
+
+public class SVGTestbedPanelWidget : StatefulWidget {
+    public SVGTestbedPanelWidget(Key key = null) : base(key) { }
+
+    public override State createState() {
+        return new SVGTestbedPanelWidgetState();
+    }
+}
+
+public class SVGTestbedPanelWidgetState : State<SVGTestbedPanelWidget> {
+    static Texture2D texture6;
+
+    public class CurvePainter : AbstractCustomPainter {
+        public override void paint(Canvas canvas, Size size) {
+            var paint = new Paint()
+            {
+                color = new Color(0xFFFF0000),
+            };
+
+            paint.color = Colors.yellow;
+            paint.style = PaintingStyle.stroke;
+            paint.strokeWidth = 3;
+
+            var startPoint = new Offset(0, size.height / 6);
+            var controlPoint1 = new Offset(size.width / 4, 0);
+            var controlPoint2 = new Offset(3 * size.width / 4, 0);
+            var endPoint = new Offset(size.width, size.height / 6);
+            
+            var path = new Path();
+            path.moveTo(startPoint.dx, startPoint.dy);
+            path.cubicTo(
+                controlPoint1.dx, controlPoint1.dy,
+                controlPoint2.dx, controlPoint2.dy,
+                endPoint.dx, endPoint.dy
+            );
+
+            path.moveTo(10, 10);
+            path.lineTo(90, 10);
+            path.lineTo(10, 90);
+            path.lineTo(90, 90);
+            path.winding(PathWinding.clockwise);
+            path.close();
+
+            path.moveTo(110, 10);
+            path.lineTo(190, 10);
+            path.lineTo(110, 90);
+            path.lineTo(190, 90);
+            path.close();
+
+            path.addRect(UIWidgetRect.fromLTWH(10, 25, 180, 50));
+
+            path.addRect(UIWidgetRect.fromLTWH(200, 0, 100, 100));
+            path.addRRect(RRect.fromRectAndRadius(UIWidgetRect.fromLTWH(225, 25, 50, 50), 10));
+            path.winding(PathWinding.clockwise);
+            path.addOval(UIWidgetRect.fromLTWH(200, 50, 100, 100));
+            path.winding(PathWinding.clockwise);
+
+
+            canvas.drawPath(path, paint);
+
+            paint = new Paint {
+                color = new Color(0xFFFF0000),
+                shader = Gradient.linear(
+                    new Offset(0, 0),
+                    new Offset(size.width, 200),
+                    new List<Color>() {
+                        Colors.red, Colors.black, Colors.green
+                    }, null, TileMode.clamp),
+            };
+            canvas.translate(0, 200);
+            canvas.drawPath(path, paint);
+
+            canvas.translate(0, 200);
+            // paint.maskFilter = MaskFilter.blur(BlurStyle.normal, 5);
+            paint.shader = new ImageShader(new Image(texture6, true), TileMode.mirror);
+            canvas.drawPath(path, paint);
+            
+            canvas.translate(0, 200);
+            paint = new Paint {
+                color = new Color(0xFF00FF00),
+                shader = Gradient.sweep(
+                    new Offset(size.width / 2, 100),
+                    new List<Color>() {
+                        Colors.red, Colors.black, Colors.green, Colors.red,
+                    }, null, TileMode.clamp, 0 * Mathf.PI / 180, 360 * Mathf.PI / 180),
+            };
+            canvas.drawPath(path, paint);
+
+
+            paint.shader = Gradient.radial(
+                new Offset(size.width / 2, 100), 200f,
+                new List<Color>()
+                {
+                    Colors.red, Colors.black, Colors.green
+                }, null, TileMode.clamp);
+            canvas.translate(0, 200);
+            canvas.drawPath(path, paint);
+        }
+
+        public override bool shouldRepaint(CustomPainter oldDelegate) {
+            return true;
+        }
+    }
+
+    public override Widget build(BuildContext context) {
+        texture6 = Resources.Load<Texture2D>("6");
+
+        return new SingleChildScrollView(
+            child: new Container(
+                child: new CustomPaint(
+                    painter: new CurvePainter(),
+                    child: new Container()
+                ),
+                height: 1500
+            )
+        );
+    }
+}