/// <summary>
/// 对当前输入的参数使用bresenham算法画圆
/// </summary>
/// <param name="center">圆心坐标</param>
/// <param name="R">半径</param>
/// <param name="color">颜色</param>
public void drawCircle_Bresenham(Point center, int R, Color color)
{
CG_Circle newCircle = new CG_Circle(center, R, color);
foreach (Point cur in newCircle.getPoints())
{
drawOnCanvas(cur, color);
}
}
/// <summary>
/// 对当前输入的参数，在圆列表中创建图元并画出来
/// </summary>
/// <param name="center">圆心坐标</param>
/// <param name="R">半径</param>
/// <param name="color">颜色</param>
/// <param name="name">名称</param>
public void drawCircle_Bresenham(Point center, int R, Color color, string name)
{
CG_Circle newCircle = new CG_Circle(center, R, color);
newCircle.Name = name;
listCircle.AddLast(newCircle);
curCircle = newCircle;
drawCircle_Bresenham(center, R, color);
}
/// <summary>
/// 根据名称改变当前curXXX所指向的图元，返回值表示所选中的图元类型
/// </summary>
/// <param name="name">名称</param>
/// <returns>line直线 circle圆 polygon多边形 rectangle矩形</returns>
public string changeCurPrimitive(string name)
{
LinkedListNode <CG_Line> curL = listLine.First;
while (curL != null)
{
if (curL.Value.Name == name)
{
curLine = curL.Value;
return("line");
}
curL = curL.Next;
}
LinkedListNode <CG_Circle> curC = listCircle.First;
while (curC != null)
{
if (curC.Value.Name == name)
{
curCircle = curC.Value;
return("circle");
}
curC = curC.Next;
}
LinkedListNode <CG_Polygon> curPol = listPolygon.First;
while (curPol != null)
{
if (curPol.Value.Name == name)
{
curPolygon = curPol.Value;
return("polygon");
}
curPol = curPol.Next;
}
LinkedListNode <CG_Rectangle> curRec = listRectangle.First;
while (curRec != null)
{
if (curRec.Value.Name == name)
{
curRectangle = curRec.Value;
return("rectangle");
}
curRec = curRec.Next;
}
LinkedListNode <CG_Bezier> curBez = listBezier.First;
while (curBez != null)
{
if (curBez.Value.Name == name)
{
curBezier = curBez.Value;
return("bezier");
}
curBez = curBez.Next;
}
return(null);
}
