111 lines
4.0 KiB
C#
111 lines
4.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Windows;
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using System.Windows.Media;
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namespace Kniip.Editor.Annotations;
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/// <summary>Vormen voor het vormengereedschap, ontworpen in een raster van 100 x 100 en bij het tekenen naar het kader geschaald.</summary>
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internal static class ShapeGeometries
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{
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private static readonly Dictionary<ShapeKind, Geometry> Cache = new();
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public static bool IsOpen(ShapeKind kind) => kind == ShapeKind.Spiral;
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public static Geometry For(ShapeKind kind)
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{
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if (!Cache.TryGetValue(kind, out Geometry? geometry))
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{
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geometry = RenderHelpers.Freeze(Create(kind));
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Cache[kind] = geometry;
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}
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return geometry;
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}
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private static Geometry Create(ShapeKind kind) => kind switch
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{
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ShapeKind.BlockArrow => Geometry.Parse("M0,30 L58,30 L58,4 L100,50 L58,96 L58,70 L0,70 Z"),
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ShapeKind.Star => Star(),
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ShapeKind.Cloud => Cloud(),
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ShapeKind.Balloon => Balloon(),
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ShapeKind.Heart => Geometry.Parse(
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"M50,95 C14,68 0,48 0,28 C0,11 13,0 28,0 C39,0 46,7 50,15 C54,7 61,0 72,0 C87,0 100,11 100,28 C100,48 86,68 50,95 Z"),
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ShapeKind.Moon => Geometry.Combine(
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new EllipseGeometry(new Point(50, 50), 50, 50),
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new EllipseGeometry(new Point(74, 38), 42, 42),
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GeometryCombineMode.Exclude, null, 0.01, ToleranceType.Absolute),
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ShapeKind.Drop => Geometry.Parse("M50,0 C58,16 85,44 85,65 A35,35 0 1 1 15,65 C15,44 42,16 50,0 Z"),
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ShapeKind.Egg => Geometry.Parse("M50,0 C77,0 94,38 94,62 C94,86 74,100 50,100 C26,100 6,86 6,62 C6,38 23,0 50,0 Z"),
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ShapeKind.Lightning => Geometry.Parse("M58,0 L14,56 L44,56 L30,100 L86,38 L56,38 L74,0 Z"),
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ShapeKind.Spiral => Spiral(),
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_ => Geometry.Parse("M50,0 L100,100 L0,100 Z")
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};
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private static Geometry Star()
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{
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var points = new Point[10];
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for (int i = 0; i < points.Length; i++)
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{
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double angle = -Math.PI / 2 + i * Math.PI / 5;
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double radius = i % 2 == 0 ? 50 : 20;
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points[i] = new Point(50 + radius * Math.Cos(angle), 50 + radius * Math.Sin(angle));
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}
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return Polygon(points, closed: true);
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}
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private static Geometry Cloud()
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{
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var center = new Point(50, 50);
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const double rx = 33, ry = 19, bump = 19;
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const int count = 6;
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Geometry cloud = new EllipseGeometry(center, rx, ry);
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for (int i = 0; i < count; i++)
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{
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double angle = 2 * Math.PI * (i + 0.5) / count;
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var p = new Point(center.X + rx * Math.Cos(angle), center.Y + ry * Math.Sin(angle));
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cloud = Geometry.Combine(cloud, new EllipseGeometry(p, bump, bump), GeometryCombineMode.Union, null, 0.01, ToleranceType.Absolute);
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}
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return cloud;
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}
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private static Geometry Balloon() =>
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Geometry.Combine(
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new RectangleGeometry(new Rect(0, 0, 100, 72), 14, 14),
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Geometry.Parse("M20,68 L10,100 L42,68 Z"),
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GeometryCombineMode.Union, null, 0.01, ToleranceType.Absolute);
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private static Geometry Spiral()
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{
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const double turns = 3;
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const int steps = 240;
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double maxAngle = turns * 2 * Math.PI;
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var points = new Point[steps + 1];
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for (int i = 0; i <= steps; i++)
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{
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double angle = maxAngle * i / steps;
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double radius = 50 * angle / maxAngle;
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points[i] = new Point(50 + radius * Math.Cos(angle), 50 + radius * Math.Sin(angle));
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}
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return Polygon(points, closed: false);
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}
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private static Geometry Polygon(IReadOnlyList<Point> points, bool closed)
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{
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var geometry = new StreamGeometry();
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using (StreamGeometryContext ctx = geometry.Open())
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{
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ctx.BeginFigure(points[0], closed, closed);
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for (int i = 1; i < points.Count; i++)
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{
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ctx.LineTo(points[i], true, true);
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}
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}
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return geometry;
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}
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}
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