using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Linq;
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using System.Windows.Forms;
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namespace CloudWaterNetwork
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{
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partial class MapControl : Control
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{
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private Point backgroundImageOffset = Point.Empty; // 背景图偏移量
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private Image backgroundImage; // 背景图片
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private RectangleF chartArea; // 直角坐标系范围
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private PointF origin; // 坐标轴原点
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private float zoomLevel = 1f; // 缩放级别
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private bool isPanning = false; // 是否正在平移
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private Point lastMousePosition = Point.Empty; // 上一次鼠标位置
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private bool isSelecting = false; // 是否正在框选矩形
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private RectangleF selectionRect; // 框选矩形
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public MapControl()
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{
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this.DoubleBuffered = true;
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}
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public Image BackgroundImage
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{
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get { return this.backgroundImage; }
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set
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{
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this.backgroundImage = value;
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this.Invalidate();
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}
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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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if (e.Button == MouseButtons.Middle)
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{
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// 启动平移模式
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this.isPanning = true;
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this.lastMousePosition = e.Location;
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}
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else if (e.Button == MouseButtons.Left)
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{
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// 启动框选矩形模式
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this.isSelecting = true;
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this.selectionRect = new RectangleF(e.Location, SizeF.Empty);
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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 (this.isPanning)
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{
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// 平移坐标系范围和背景图片
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int dx = e.X - this.lastMousePosition.X;
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int dy = e.Y - this.lastMousePosition.Y;
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this.backgroundImageOffset.Offset(dx, dy);
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this.chartArea.Offset(dx / this.zoomLevel, -dy / this.zoomLevel);
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this.origin.X += dx;
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this.origin.Y += dy;
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//Offset(dx, dy);
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this.lastMousePosition = e.Location;
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this.Invalidate();
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}
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else if (this.isSelecting)
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{
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// 更新框选矩形范围
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this.selectionRect.Width = e.X - this.selectionRect.Left;
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this.selectionRect.Height = e.Y - this.selectionRect.Top;
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this.Invalidate();
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}
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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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if (this.isPanning)
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{
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// 停止平移模式
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this.isPanning = false;
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}
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else if (this.isSelecting)
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{
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// 停止框选矩形模式，并重新计算坐标系范围和原点位置
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this.isSelecting = false;
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float x1 = (this.selectionRect.Left - this.origin.X) * (this.chartArea.Width / this.ClientSize.Width) + this.chartArea.Left;
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float y1 = (this.ClientSize.Height - this.selectionRect.Bottom + this.origin.Y) * (this.chartArea.Height / this.ClientSize.Height) + this.chartArea.Top;
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float x2 = (this.selectionRect.Right - this.origin.X) * (this.chartArea.Width / this.ClientSize.Width) + this.chartArea.Left;
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float y2 = (this.ClientSize.Height - this.selectionRect.Top + this.origin.Y) * (this.chartArea.Height / this.ClientSize.Height) + this.chartArea.Top;
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this.chartArea = new RectangleF(x1, y1, x2 - x1, y2 - y1);
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this.origin = new PointF(this.chartArea.Left, this.chartArea.Bottom);
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this.Invalidate();
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}
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}
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protected override void OnMouseWheel(MouseEventArgs e)
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{
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base.OnMouseWheel(e);
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// 缩放坐标系范围和背景图片
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float factor = e.Delta > 0 ? 1.1f : 0.9f;
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float oldZoomLevel = this.zoomLevel;
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this.zoomLevel *= factor;
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if (this.zoomLevel < 0.1f)
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{
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this.zoomLevel = 0.1f;
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}
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if (this.zoomLevel > 10f)
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{
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this.zoomLevel = 10f;
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}
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float dx = (this.chartArea.Width / oldZoomLevel - this.chartArea.Width / this.zoomLevel) / 2;
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float dy = (this.chartArea.Height / oldZoomLevel - this.chartArea.Height / this.zoomLevel) / 2;
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this.backgroundImageOffset.Offset((int)(e.Location.X * dx), (int)(e.Location.Y * dy));
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this.chartArea.Inflate(dx, dy);
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this.origin = new PointF(this.chartArea.Left, this.chartArea.Bottom);
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this.Invalidate();
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}
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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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// 绘制背景图片
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if (this.backgroundImage != null)
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{
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e.Graphics.DrawImage(this.backgroundImage, this.backgroundImageOffset);
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}
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// 绘制直角坐标系和矩形
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using (Pen axisPen = new Pen(Color.Black, 2))
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{
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e.Graphics.DrawLine(axisPen, this.origin.X, this.origin.Y, this.origin.X + this.chartArea.Width / this.zoomLevel, this.origin.Y); // X轴
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e.Graphics.DrawLine(axisPen, this.origin.X, this.origin.Y, this.origin.X, this.origin.Y - this.chartArea.Height / this.zoomLevel); // Y轴
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if (this.isSelecting)
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{
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// 绘制框选矩形
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using (Pen selectionPen = new Pen(Color.Red, 2))
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{
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selectionPen.DashStyle = DashStyle.Dot;
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e.Graphics.DrawRectangle(selectionPen, Rectangle.Round(this.selectionRect));
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}
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}
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}
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}
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protected override void OnResize(EventArgs e)
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{
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base.OnResize(e);
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// 初始化坐标系范围和原点位置
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float widthRatio = (float)this.ClientSize.Width / this.chartArea.Width;
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float heightRatio = (float)this.ClientSize.Height / this.chartArea.Height;
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float zoomRatio = Math.Min(widthRatio, heightRatio);
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this.chartArea = new RectangleF(0, 0, this.ClientSize.Width / zoomRatio, this.ClientSize.Height / zoomRatio);
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this.origin = new PointF(this.chartArea.Left, this.chartArea.Bottom);
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this.Invalidate();
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}
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}
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}
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