using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace DPumpHydr.WinFrmUI.Volute
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{
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public partial class DesignDraw1 : UserControl
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{
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public DesignDraw1()
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{
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Point start = new Point(20, 120);
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Point control1 = new Point(40, 90);
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Point control2 = new Point(60, 150);
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Point end1 = new Point(100, 180);
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Point control3 = new Point(120, 170);
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Point control4 = new Point(135, 190);
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Point end2 = new Point(150, 220);
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screenPoints = new List<Point> { start, control1, control2, end1, control3, control4, end2 };
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}
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List<Point> screenPoints;
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protected override void OnPaint(PaintEventArgs e)
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{
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base.OnPaint(e);
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Graphics g = e.Graphics;
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if (_dragPointNO >= 0)
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{
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using (Pen penUn = new Pen(Color.Gray, 2f))
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using (SolidBrush penSelect = new SolidBrush(Color.Red))
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{
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for (int i = 0; i < screenPoints.Count; i++)
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{
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var pt = screenPoints[i];
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if (i == _dragPointNO)
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g.FillEllipse(penSelect, pt.X - 4f, pt.Y - 4f, 8, 8);
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else
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g.DrawEllipse(penUn, pt.X - 4f, pt.Y - 4f, 8, 8);
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}
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}
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}
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else
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{
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using (SolidBrush penBrush = new SolidBrush(Color.Black))
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{
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foreach (var pt in screenPoints)
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{
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g.FillEllipse(penBrush, pt.X - 4f, pt.Y - 4f, 8, 8);
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}
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}
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}
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using (Pen penCurve = new Pen(Color.Blue, 2f))
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{
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g.DrawBeziers(penCurve, screenPoints.ToArray());
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}
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}
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int _dragPointNO = -1;
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protected override void OnMouseClick(MouseEventArgs e)
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{
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base.OnMouseClick(e);
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}
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protected override void OnMouseUp(MouseEventArgs e)
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{
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base.OnMouseUp(e);
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this.Cursor = Cursors.Default;
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if (_dragPointNO >= 0)
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{
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//鼠标未移除控件范围
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if (this.ClientRectangle.Contains(e.Location))
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{
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screenPoints[_dragPointNO] = e.Location;
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Invalidate();
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}
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}
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_dragPointNO = -1;
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}
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protected override void OnMouseDown(MouseEventArgs e)
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{
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base.OnMouseDown(e);
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_dragPointNO = -1;
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this.Cursor = Cursors.Default;
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//判断是否在点周围
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Rectangle r = new Rectangle(e.X - 5, e.Y - 5, 10, 10);
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for (int i = 0; i < screenPoints.Count; i++)
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{
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if (r.Contains(screenPoints[i]))
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{
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_dragPointNO = i;
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this.Cursor = Cursors.Hand;
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Invalidate();
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break;
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}
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}
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}
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protected override void OnMouseMove(MouseEventArgs e)
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{
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base.OnMouseMove(e);
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if (_dragPointNO >= 0)
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{
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//鼠标未移除控件范围
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if (this.ClientRectangle.Contains(e.Location))
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{
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screenPoints[_dragPointNO] = e.Location;
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Invalidate();
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}
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}
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}
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}
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}
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