//计算线段对应比例点
private void CalcButton_Click(object sender, EventArgs e)
{
try
{
float Ratio = (float)(PolyLineRatioScrollBar.Value / 100.0);
double ScaleRatio = Convert.ToDouble(RatioTextBox.Text);
if (Ratio < 0 || Ratio > 1)
{
throw new Exception("所求线段比例非法！");
}
else
{
PlotPoint Target = new PlotPoint(); //为所求点新建对象
Target = Algorithm.GetPointPos(Line.Points, Ratio); //计算所求点位置
ClearAndDraw();
PolyLineDrawing.DrawPoints(Target, PlotPointPictureBox, Algorithm.InverseColor(PointColorPictureBox.BackColor), PointWidthTrackBar.Value);
PolyLineDrawing.DrawFonts(Target, "P", PlotPointPictureBox, FontColorPictureBox.BackColor, FontStyleDisplayLabel.Font, PointWidthTrackBar.Value);
PlotPointPictureBox.Invalidate();
//计算并输出实际坐标系点位
PlotPoint Corrected = Algorithm.GetActualPos(PlotPointPictureBox, Target);
ResultLabel.Text = "点位：(" + (Corrected.X * ScaleRatio / PlotPointPictureBox.Width).ToString("0.0000") + ", " + (Corrected.Y * ScaleRatio / PlotPointPictureBox.Width).ToString("0.0000") + ") (m)";
IsCalculated = true;
}
}
catch (Exception err)
{
MessageBoxes.Error(err.Message);
}
}
//点绘制方法
internal static void DrawPoints(PlotPoint Points, PictureBox TargetPictureBox, Color PointColor, int PointWidth)
{
Graphics g = Graphics.FromImage(TargetPictureBox.BackgroundImage);
g.SmoothingMode = SmoothingMode.AntiAlias;
Brush PointBrush = new SolidBrush(PointColor);
g.FillEllipse(PointBrush, Points.X - PointWidth / 2, Points.Y - PointWidth / 2, PointWidth, PointWidth);
}
internal static void DrawLines(PlotPoint Point1, PlotPoint Point2, PictureBox TargetPictureBox, Color LineColor, int LineWidth)
{
Graphics g = Graphics.FromImage(TargetPictureBox.BackgroundImage);
g.SmoothingMode = SmoothingMode.AntiAlias;
Pen DrawLines = new Pen(LineColor, LineWidth);
g.DrawLine(DrawLines, Point1.X, Point1.Y, Point2.X, Point2.Y);
}
//预览线绘制方法
internal static void DrawPreviewLine(PlotPoint StartPoint, PlotPoint EndPoint, PictureBox TargetPictureBox, Color LineColor, int LineWidth)
{
Graphics g = Graphics.FromImage(TargetPictureBox.BackgroundImage);
g.SmoothingMode = SmoothingMode.AntiAlias;
Pen DrawLines = new Pen(LineColor, LineWidth)
{
//预览线虚线样式
DashStyle = DashStyle.Custom,
DashPattern = new float[] { 2, 2 }
};
g.DrawLine(DrawLines, StartPoint.X, StartPoint.Y, EndPoint.X, EndPoint.Y);
}
//文字绘制方法
internal static void DrawFonts(PlotPoint Points, string No, PictureBox TargetPictureBox, Color FontColor, Font FontStyle, int PointWidth)
{
Graphics g = Graphics.FromImage(TargetPictureBox.BackgroundImage);
g.SmoothingMode = SmoothingMode.AntiAlias;
Font PointStyle = FontStyle;
SolidBrush PointBrush = new SolidBrush(FontColor);
PointF FontPos = new PointF
{
X = Convert.ToSingle(Points.X - FontStyle.Size / 2 + FontStyle.Size * -Math.Cos(Math.Atan2(Points.Y - TargetPictureBox.Height / 2, Points.X - TargetPictureBox.Width / 2))),
Y = Convert.ToSingle(Points.Y - FontStyle.Size / 2 + FontStyle.Size * -Math.Sin(Math.Atan2(Points.Y - TargetPictureBox.Height / 2, Points.X - TargetPictureBox.Width / 2)))
};
g.DrawString(No, PointStyle, PointBrush, FontPos.X, FontPos.Y);
}
//获取所求比例点坐标
internal static PlotPoint GetPointPos(List <PlotPoint> Points, float Proportion)
{
if (Points.Count <= 1)
{
throw new Exception("点位过少");
}
if (Proportion == 0)
{
float xx = Points[0].X;
float yy = Points[0].Y;
PlotPoint PointPos = new PlotPoint {
X = xx, Y = yy
};
return(PointPos);
}
else
{
double TargetLength = GetPolyLineLength(Points) * Proportion; //获取目标长度
int i = 0;
double CurrentLength = 0.0;
//获取超过指定比例长度的第一个点
while (CurrentLength < TargetLength)
{
CurrentLength += GetSingleLineLength(Points[i], Points[i + 1]);
i++;
}
//获取超过指定比例长度的前一个点
int j = i - 1;
double PreLength = CurrentLength - GetSingleLineLength(Points[j], Points[i]); //获取至前一点的长度
double RemainLength = TargetLength - PreLength; //获取在目标线段上的剩余距离
double CurrentLineLength = GetSingleLineLength(Points[j], Points[i]); //获取目标点所在线段长度
float Pro = (float)(RemainLength / CurrentLineLength); //计算目标点在线段上的比例
PlotPoint PointPos = new PlotPoint {
X = Points[j].X + (Points[i].X - Points[j].X) * Pro, Y = Points[j].Y + (Points[i].Y - Points[j].Y) * Pro
};
return(PointPos);
}
}
//预览或编辑
private void PreviewOrEdit(object sender, MouseEventArgs e)
{
try
{
//预览
if (IsDrawing && IsPreviewing)
{
PlotPoint Preview = new PlotPoint
{
X = e.X,
Y = e.Y
};
ClearAndDraw();
if (Line.Points.Count > 0)
{
if (PolyLineCalcGroupBox.Visible)
{
PolyLineLengthLabel.Text = "折线长度：" + (((Algorithm.GetPolyLineLength(Line.Points) + Algorithm.GetSingleLineLength(Line.Points[Line.Points.Count - 1], Preview)) / (PlotPointPictureBox.Width)) * Convert.ToDouble(RatioTextBox.Text)).ToString("0.0000") + " (m)";
}
if (IsPolygonCheckBox.Checked)
{
if (Line.Points.Count > 1)
{
PolyLineDrawing.DrawPolygon(Line.Points, PlotPointPictureBox, PolygonColorPictureBox.BackColor, PolygonTransparencyTrackBar.Value * 255 / (PolygonTransparencyTrackBar.Maximum - PolygonTransparencyTrackBar.Minimum), Preview);
List <PlotPoint> PreviewArea = new List <PlotPoint>();
for (int i = 0; i < Line.Points.Count(); i++)
{
PreviewArea.Add(Line.Points[i]);
}
PreviewArea.Add(Preview);
PolygonAreaLabel.Text = "多边形面积：" + (Algorithm.GetPolygonArea(PreviewArea, PlotPointPictureBox, Convert.ToSingle(RatioTextBox.Text))).ToString("0.0000") + "（m ^ 2）";
}
PolyLineDrawing.DrawPreviewLine(Line.Points[0], Preview, PlotPointPictureBox, Algorithm.InverseColor(LineColorPictureBox.BackColor), LineWidthTrackBar.Value);
}
PolyLineDrawing.DrawPreviewLine(Line.Points[Line.Points.Count - 1], Preview, PlotPointPictureBox, Algorithm.InverseColor(LineColorPictureBox.BackColor), LineWidthTrackBar.Value);
}
PolyLineDrawing.DrawPoints(Preview, PlotPointPictureBox, Algorithm.InverseColor(PointColorPictureBox.BackColor), PointWidthTrackBar.Value);
PolyLineDrawing.DrawFonts(Preview, Convert.ToString(Line.Points.Count + 1), PlotPointPictureBox, FontColorPictureBox.BackColor, FontStyleDisplayLabel.Font, PointWidthTrackBar.Value);
PlotPointPictureBox.Invalidate();
}
//编辑
if (!IsDrawing && IsEditing && !IsPointMoving && Line.Points.Count != 0)
{
PlotPointPictureBox.Cursor = Cursors.Arrow;
List <double> Dis = new List <double>();
PlotPoint EditPos = new PlotPoint
{
X = e.X,
Y = e.Y
};
foreach (PlotPoint Point in Line.Points)
{
Dis.Add(Algorithm.GetSingleLineLength(EditPos, Point));
}
//找最小距离点
double MinDistance = Dis[0];
int MinDistanceIndex = 0;
for (int i = 0; i < Dis.Count; i++)
{
if (Dis[i] < MinDistance)
{
MinDistance = Dis[i];
MinDistanceIndex = i;
}
}
//小于容差则选中
if (MinDistance < Convert.ToDouble(ToleranceTextBox.Text))
{
IsPointSelected = true;
PlotPointPictureBox.Cursor = CrossCur;
SelectedPointIndex = MinDistanceIndex;
DrawingTipLabel.Text = "已选中第" + Convert.ToString(SelectedPointIndex + 1) + "个点，按住鼠标左键拖动以改变位置，按Del或鼠标右键删除";
PolyLineDrawing.DrawPoints(Line.Points[SelectedPointIndex], PlotPointPictureBox, Algorithm.InverseColor(PointColorPictureBox.BackColor), Convert.ToInt32(PointWidthTrackBar.Value * 1.5));
PlotPointPictureBox.Refresh();
}
else
{
if (SelectedPointIndex != -1)
{
ClearAndDraw();
}
DisSelect();
DrawingTipLabel.Text = "未选中任何点";
}
}
//移动选中点
if (!IsDrawing && IsEditing && IsPointMoving && Line.Points.Count != 0)
{
if (e.X >= 0 && e.Y >= 0 && e.X <= PlotPointPictureBox.Width && e.Y <= PlotPointPictureBox.Height)
{
Line.Points[SelectedPointIndex].X = e.X;
Line.Points[SelectedPointIndex].Y = e.Y;
ClearAndDraw();
DrawingTipLabel.Text = "正在移动第" + Convert.ToString(SelectedPointIndex + 1) + "个点";
}
else
{
DisSelect();
DrawingTipLabel.Text = "焦点丢失";
}
}
}
catch (Exception err)
{
MessageBoxes.Error(err.Message);
}
}
//预览多边形绘制
internal static void DrawPolygon(List <PlotPoint> Points, PictureBox TargetPictureBox, Color PolygonColor, int PolygonTransparency, PlotPoint PreviewingPoint)
{
Graphics g = Graphics.FromImage(TargetPictureBox.BackgroundImage);
g.SmoothingMode = SmoothingMode.AntiAlias;
Brush PolygonBrush = new SolidBrush(Color.FromArgb(PolygonTransparency, PolygonColor.R, PolygonColor.G, PolygonColor.B));
List <PointF> PolygonPoints = new List <PointF>();
for (int i = 0; i < Points.Count; i++)
{
PolygonPoints.Add(new PointF {
X = Points[i].X, Y = Points[i].Y
});
}
PolygonPoints.Add(new PointF {
X = PreviewingPoint.X, Y = PreviewingPoint.Y
});
g.FillPolygon(PolygonBrush, PolygonPoints.ToArray());
}
//计算单条线段长度
internal static double GetSingleLineLength(PlotPoint StartPoint, PlotPoint EndPoint)
{
return(Math.Sqrt(Math.Pow((EndPoint.X - StartPoint.X), 2) + Math.Pow((EndPoint.Y - StartPoint.Y), 2)));
}
//将点移至控件中心为原点坐标系
internal static PlotPoint GetActualPos(PictureBox TargetPictureBox, PlotPoint Points)
{
Points.X -= (TargetPictureBox.Width / 2);
Points.Y = (TargetPictureBox.Width / 2) - Points.Y;
return(Points);
}