private void DrawPanel()
{
int width = pnlImage.Width;
int height = pnlImage.Height;
Bitmap image = new Bitmap(width, height);
Graphics g = Graphics.FromImage(image);
g.Clear(Color.Black);
float count = 4;
float length = 75;
UnitPoint p1 = new UnitPoint(20, 90);
UnitPoint p2 = new UnitPoint(35, 65);
UnitPoint p3 = new UnitPoint(50, 90);
UnitPoint intersecte1 = HitUtil.GetLinePointByDistance(p2, p1, length, false);
UnitPoint intersecte2 = HitUtil.GetLinePointByDistance(p2, p3, length, false);
List <UnitPoint> pointBers = new List <UnitPoint>();
pointBers.Add(p2);
pointBers.Add(intersecte1);
pointBers.Add(intersecte2);
pointBers.Add(p2);
List <UnitPoint> pointLines = new List <UnitPoint>();
pointLines.Add(p1);
pointLines.Add(p2);
pointLines.Add(p3);
for (int i = 0; i < count; i++)
{
var ps = pointBers.Select(e => new PointF((float)(e.X + Math.Abs(p1.X - p3.X) * i), (float)e.Y));
g.DrawBeziers(Pens.LimeGreen, ps.ToArray());
}
for (int i = 0; i < count; i++)
{
var ps = pointLines.Select(e => new PointF((float)(e.X + Math.Abs(p1.X - p3.X) * i), (float)e.Y));
g.DrawLines(Pens.LimeGreen, ps.ToArray());
}
using (Graphics tg = pnlImage.CreateGraphics())
{
tg.DrawImage(image, 0, 0); //把画布贴到画面上
}
}
public static UnitPoint GetCenterByBulgeAndTwoPoints(UnitPoint p1, UnitPoint p2, double bulge)
{
//UnitPoint centerPoints;
//double chord = HitUtil.Distance(p1, p2);
//double radius = chord / (2 * Math.Sin(2 * Math.Atan(Math.Abs(bulge))));
//double c1 = (p2.X * p2.X - p1.X * p1.X + p2.Y * p2.Y - p1.Y * p1.Y) / (2 * (p2.X - p1.X));
//double c2 = (p2.Y - p1.Y) / (p2.X - p1.X);
//double A = (c2 * c2 + 1);
//double B = (2 * p1.X * c2 - 2 * c1 * c2 - 2 * p1.Y);
//double C = p1.X * p1.X - 2 * p1.X * c1 + c1 * c1 + p1.Y * p1.Y - radius * radius;
//double y1 = (-B + Math.Sqrt(B * B - 4 * A * C)) / (2 * A);
//double y2 = (-B - Math.Sqrt(B * B - 4 * A * C)) / (2 * A);
//double x1 = c1 - c2 * y1;
//double x2 = c1 - c2 * y2;
//UnitPoint centerPoints1 = new UnitPoint(x1, y1);
//UnitPoint centerPoints2 = new UnitPoint(x2, y2);
//double err1 = IsCorrectCenter(centerPoints1, radius, bulge, p1, p2);
//double err2 = IsCorrectCenter(centerPoints2, radius, bulge, p1, p2);
//centerPoints = err1 < err2 ? centerPoints1 : centerPoints2;
//return centerPoints;
UnitPoint centerPoints = new UnitPoint();
double chord = HitUtil.Distance(p1, p2);
double radius = chord / (2 * Math.Sin(2 * Math.Atan(Math.Abs(bulge))));
//1.求p1,p2的中间点
UnitPoint midPoint = HitUtil.GetLinePointByDistance(p1, p2, chord / 2, true);
double length = Math.Sqrt(Math.Pow(radius, 2) - Math.Pow(chord / 2, 2));
//2.求等距离的垂线点
var centers = DrawingOperationHelper.GetLinePointByVerticalLine(midPoint, p1, length);
//3.筛选圆心坐标
double err1 = IsCorrectCenter(centers.Item1, radius, bulge, p1, p2);
double err2 = IsCorrectCenter(centers.Item2, radius, bulge, p1, p2);
centerPoints = err1 < err2 ? centers.Item1 : centers.Item2;
return(centerPoints);
}