76 lines
2.7 KiB
C#
76 lines
2.7 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Windows;
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using System.Windows.Ink;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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namespace Ink_Canvas.Helpers
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{
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public class RectangleSelectionViewer : FrameworkElement
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{
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private VisualCollection _children;
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private DrawingVisual _layer = new DrawingVisual();
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private Pen defaultPen = new Pen();
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private Pen lassoPen = new Pen();
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public RectangleSelectionViewer()
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{
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_children = new VisualCollection(this) {
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_layer // 初始化DrawingVisual
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};
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defaultPen.Thickness = 2;
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defaultPen.Brush = new SolidColorBrush(Color.FromRgb(37, 99, 235));
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defaultPen.DashStyle = DashStyles.Dash;
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lassoPen.Thickness = 6;
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lassoPen.Brush = new SolidColorBrush(Color.FromRgb(37, 99, 235));
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lassoPen.DashStyle = new DashStyle(new double[]{0,2},0);
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lassoPen.DashCap = PenLineCap.Round;
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lassoPen.StartLineCap = PenLineCap.Round;
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lassoPen.EndLineCap = PenLineCap.Round;
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}
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protected override int VisualChildrenCount => _children.Count;
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protected override Visual GetVisualChild(int index)
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{
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if (index < 0 || index >= _children.Count) throw new ArgumentOutOfRangeException();
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return _children[index];
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}
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public void DrawSelectionBox(Rect rect) {
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DrawingContext context = _layer.RenderOpen();
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context.DrawRoundedRectangle(new SolidColorBrush(Color.FromArgb(78, 96, 165, 250)), defaultPen, rect, 4, 4);
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context.Close();
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}
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public void DrawLassoLine(PointCollection pts) {
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DrawingContext context = _layer.RenderOpen();
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if (pts.Count > 2) {
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StreamGeometry geometry = new StreamGeometry();
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var _pts = pts.Clone();
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_pts.RemoveAt(0);
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using (StreamGeometryContext ctx = geometry.Open()) {
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ctx.BeginFigure(pts[0], true , false);
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ctx.PolyLineTo(_pts,true, true);
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}
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context.DrawGeometry(new SolidColorBrush(Colors.Transparent), lassoPen, geometry);
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} else if (pts.Count == 2) {
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context.DrawLine(defaultPen, pts[0], pts[1]);
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} else if (pts.Count == 1) {
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context.DrawLine(defaultPen, pts[0], pts[0]);
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}
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context.Close();
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}
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public void ClearDrawing() {
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DrawingContext context = _layer.RenderOpen();
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context.Close();
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}
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}
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}
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