public void Earser(Point p0)
{
for (int i = lineHistory.Count - 1; i >= 0; i--)
{
HLine line = lineHistory[i];
bool flag = false;
foreach (Point p1 in line.PointList)
{
double distance = GetDistance(p0, p1);
if (Math.Abs(distance) < 6)
{
//需要删除
flag = true;
break;
}
}
if (flag)
{
lineHistory.RemoveAt(i);
}
}
//擦除矩形
for (int i = rectHistory.Count - 1; i >= 0; i--)
{
HRectangle rect = rectHistory[i];
if (p0.X > rect.Start.X && p0.X < rect.End.X && p0.Y > rect.Start.Y && p0.Y < rect.End.Y)
{
rectHistory.RemoveAt(i);
}
}
}
/// <summary>
/// 绘制矩形
/// </summary>
/// <param name="g"></param>
/// <param name="rect"></param>
private void DrawRectangle(Graphics g, HRectangle rect)
{
g.SmoothingMode = SmoothingMode.AntiAlias;
using (Pen p = new Pen(rect.LineColor, rect.LineWidth))
{
//设置起止点线帽
p.StartCap = LineCap.Round;
p.EndCap = LineCap.Round;
//设置连续两段的联接样式
p.LineJoin = LineJoin.Round;
g.DrawRectangle(p, rect.Start.X, rect.Start.Y, rect.End.X - rect.Start.X, rect.End.Y - rect.Start.Y); //画平滑曲线
}
}
