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91 行
3.0 KiB
91 行
3.0 KiB
using System.Collections.Generic;
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using Unity.UIWidgets.ui;
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using UnityEngine;
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using Rect = Unity.UIWidgets.ui.Rect;
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namespace Unity.UIWidgets.painting {
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public abstract class NotchedShape {
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public NotchedShape() {
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}
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public abstract Path getOuterPath(Rect host, Rect guest);
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}
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public class CircularNotchedRectangle : NotchedShape {
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public CircularNotchedRectangle() {
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}
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public override Path getOuterPath(Rect host, Rect guest) {
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if (guest == null || !host.overlaps(guest)) {
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Path path = new Path();
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path.addRect(host);
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return path;
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}
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float notchRadius = guest.width / 2.0f;
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const float s1 = 15.0f;
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const float s2 = 1.0f;
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float r = notchRadius;
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float a = -1.0f * r - s2;
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float b = host.top - guest.center.dy;
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float n2 = Mathf.Sqrt(b * b * r * r * (a * a + b * b - r * r));
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float p2xA = ((a * r * r) - n2) / (a * a + b * b);
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float p2xB = ((a * r * r) + n2) / (a * a + b * b);
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float p2yA = Mathf.Sqrt(r * r - p2xA * p2xA);
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float p2yB = Mathf.Sqrt(r * r - p2xB * p2xB);
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Offset[] p = new Offset[6];
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p[0] = new Offset(a - s1, b);
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p[1] = new Offset(a, b);
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float cmp = b < 0 ? -1.0f : 1.0f;
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p[2] = cmp * p2yA > cmp * p2yB ? new Offset(p2xA, p2yA) : new Offset(p2xB, p2yB);
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p[3] = new Offset(-1.0f * p[2].dx, p[2].dy);
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p[4] = new Offset(-1.0f * p[1].dx, p[1].dy);
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p[5] = new Offset(-1.0f * p[0].dx, p[0].dy);
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for (int i = 0; i < p.Length; i += 1) {
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p[i] += guest.center;
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}
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Path ret = new Path();
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ret.moveTo(host.left, host.top);
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ret.lineTo(p[0].dx, p[0].dy);
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ret.quadraticBezierTo(p[1].dx, p[1].dy, p[2].dx, p[2].dy);
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ret.arcToPoint(
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p[3],
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radius: Radius.circular(notchRadius),
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clockwise: false);
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ret.quadraticBezierTo(p[4].dx, p[4].dy, p[5].dx, p[5].dy);
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ret.lineTo(host.right, host.top);
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ret.lineTo(host.right, host.bottom);
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ret.lineTo(host.left, host.bottom);
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ret.close();
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return ret;
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}
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}
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class AutomaticNotchedShape : NotchedShape {
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public AutomaticNotchedShape(ShapeBorder host, ShapeBorder guest = null) {
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this.host = host;
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this.guest = guest;
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}
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public readonly ShapeBorder host;
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public readonly ShapeBorder guest;
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public override Path getOuterPath(Rect hostRect, Rect guestRect) {
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Path hostPath = this.host.getOuterPath(hostRect);
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if (this.guest != null && guestRect != null) {
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Path guestPath = this.guest.getOuterPath(guestRect);
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return Path.combine(PathOperation.difference, hostPath, guestPath);
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}
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return hostPath;
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}
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}
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}
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