/// <summary>
/// 绘制画布事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
///鼠标位置输出
label1.Text = "( " + poiCursor.X + ", " + poiCursor.Y + ") pixel";
///鼠标位置被引力场捕获，绘制引力场
if (isGravitationCaptured != -1)
{
Graphics g = e.Graphics;
if (isGravitationCaptured == madeBezierList.Count())
{
///当前是被 inputList 吸引
///显示该点的引力场
g.DrawEllipse(new Pen(Color.Yellow), poiGravitation.X - myStatic.poi2poiDistMin, poiGravitation.Y - myStatic.poi2poiDistMin, myStatic.poi2poiDistMin * 2, myStatic.poi2poiDistMin * 2);
g.FillRectangle(new SolidBrush(Color.Yellow), inputPoiList[CatchID].X - 2, inputPoiList[CatchID].Y - 2, 4, 4);
}
else
{
///被 madeBezierList[isGravitationCaptured] 吸引
///可能是被点或边捕获
if (CatchID < madeBezierList[isGravitationCaptured].P.poiList.Count())
{
///被点捕获，显示点的引力场
g.DrawEllipse(new Pen(Color.Yellow), poiGravitation.X - myStatic.poi2poiDistMin, poiGravitation.Y - myStatic.poi2poiDistMin, myStatic.poi2poiDistMin * 2, myStatic.poi2poiDistMin * 2);
}
else
{
///被边捕获，显示边的引力场，画一个矩形+俩圆
int cou = CatchID - madeBezierList[isGravitationCaptured].P.poiList.Count();
Edge edge = new Edge(madeBezierList[isGravitationCaptured].P.poiList[cou], madeBezierList[isGravitationCaptured].P.poiList[cou + 1]);
///竖直的线段
if (edge.poi1.X == edge.poi2.X)
{
if (edge.poi1.Y > edge.poi2.Y)
{
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin, edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin, edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin, edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin, edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin);
}
else
{
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin, edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin, edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin, edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin, edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin);
}
}
//水平的线段
else if (edge.poi1.Y == edge.poi2.Y)
{
if (edge.poi1.X > edge.poi2.X)
{
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin, edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin, edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin, edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin, edge.poi1.X + myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin);
}
else
{
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin, edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin, edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin, edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin);
g.DrawLine(new Pen(Color.Yellow), edge.poi2.X + myStatic.poi2edgeDistMin, edge.poi2.Y + myStatic.poi2edgeDistMin, edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y + myStatic.poi2edgeDistMin);
}
}
///倾斜的线段
else
{
///边的缓冲区边界
g.DrawLine(new Pen(Color.Yellow, myStatic.poi2edgeDistMin * 2), edge.poi1, edge.poi2);
g.DrawLine(new Pen(Color.White, (myStatic.poi2edgeDistMin - 1) * 2), edge.poi1, edge.poi2);
///端点的缓冲区边界
///端点的缓冲区用的是边的引力大小
g.DrawEllipse(new Pen(Color.Yellow), edge.poi1.X - myStatic.poi2edgeDistMin, edge.poi1.Y - myStatic.poi2edgeDistMin, myStatic.poi2edgeDistMin * 2, myStatic.poi2edgeDistMin * 2);
g.DrawEllipse(new Pen(Color.Yellow), edge.poi2.X - myStatic.poi2edgeDistMin, edge.poi2.Y - myStatic.poi2edgeDistMin, myStatic.poi2edgeDistMin * 2, myStatic.poi2edgeDistMin * 2);
}
}
}
}
///绘制已完成贝塞尔曲线对象
if (madeBezierList.Count() != 0)
{
foreach (Bezier bezier in madeBezierList)
{
if (isBorderVisible)
{
bezier.P.drawMyself(e, Color.Black);
}
bezier.drawMyself(e, Color.Blue);
}
}
///绘制当前绘制中的图形
if (!isDrawFinished)
{
Bezier bezierTemp = new Bezier(new Polyline(inputPoiList));
if (isBorderVisible)
{
bezierTemp.P.drawMyself(e, poiCursor);
}
bezierTemp.drawMyself(e, Color.Blue);
}
///若有选中正在拖动，叠加显示
if (isCheck)
{
Graphics g = e.Graphics;
///选中的是点
///绘制一个巨大的圆形，大小是点的引力场大小
if (CatchID < madeBezierList[isGravitationCaptured].P.poiList.Count())
{
g.FillEllipse(new SolidBrush(Color.LightGreen), madeBezierList[isGravitationCaptured].P.poiList[CatchID].X - myStatic.poi2poiDistMin, madeBezierList[isGravitationCaptured].P.poiList[CatchID].Y - myStatic.poi2poiDistMin, myStatic.poi2poiDistMin * 2, myStatic.poi2poiDistMin * 2);
}
///选中边
///被选中的贝塞尔曲线的控制多边形变色
else
{
madeBezierList[isGravitationCaptured].P.drawMyself(e, Color.LightGreen);
}
}
}
