private static void EllipsePlot(double cx, double cy, double x, double y)
{
CSys.SetDotLocInfor(new Point(cx, cy));
CSys.SetDotLocInfor(new Point(cx + x, cy + y));
CSys.SetDotLocInfor(new Point(cx - x, cy + y));
CSys.SetDotLocInfor(new Point(cx + x, cy - y));
CSys.SetDotLocInfor(new Point(cx - x, cy - y));
}
/// <summary>
/// DDA画线法
/// </summary>
/// <param name="Sx">起点横坐标</param>
/// <param name="Sy">起点纵坐标</param>
/// <param name="Ex">终点横坐标</param>
/// <param name="Ey">终点纵坐标</param>
public static void DrawStraitLineDDA(double Sx, double Sy, double Ex, double Ey)
{
if (Sx < Ex)//直线趋势向右
{
double y = Sy, k;
k = (Ey - Sy) / (Ex - Sx);
for (double x = Sx; x <= Ex; x++)
{
CSys.SetDotLocInfor(new Point(x, y));
y = y + k;
}
}
else if (Sx > Ex)//直线趋势向左
{
double k, tmpX, tmpY;
tmpX = Sx;//互换输入起点终点的横坐标
Sx = Ex;
Ex = tmpX;
tmpY = Sy;//互换输入起点终点的纵坐标
Sy = Ey;
Ey = tmpY;
double y = Sy;
k = (Ey - Sy) / (Ex - Sx);
for (double x = Sx; x <= Ex; x++)
{
CSys.SetDotLocInfor(new Point(x, y));
y = y + k;
}
}
else//直线竖直
{
if (Sy < Ey)//从上往下画线
{
double x = Sx;
for (double y = Sy; y <= Ey; y++)
{
CSys.SetDotLocInfor(new Point(x, y));
}
}
else//从下往上画线
{
double tmpX, tmpY;
tmpX = Sx;//互换输入起点终点的横坐标
Sx = Ex;
Ex = tmpX;
tmpY = Sy;//互换输入起点终点的纵坐标
Sy = Ey;
Ey = tmpY;
double x = Sx;
for (double y = Sy; y <= Ey; y++)
{
CSys.SetDotLocInfor(new Point(x, y));
}
}
}
}
/// <summary>
/// 矩形生成算法-填充
/// </summary>
/// <param name="width">宽</param>
/// <param name="height">高</param>
/// <param name="Sx">矩形左上角点横坐标</param>
/// <param name="Sy">矩形左上角点纵坐标</param>
public static void RectangleFillAlgo(int Sx, int Sy, int width, int height)
{
CSys.SetDotLocInfor(new Point(Sx, Sy));
for (int i = 0; i < width; i++)
{
for (int j = 0; j < height; j++)
{
CSys.SetDotLocInfor(new Point(Sx + i, Sy + j));
}
}
}
/// <summary>
/// 中点画圆算法设置点的位置信息
/// </summary>
/// <param name="Cx">圆心横坐标</param>
/// <param name="Cy">圆心纵坐标</param>
private static void SetPointsLocInfor(double Cx, double Cy, double x, double y)
{
CSys.SetDotLocInfor(new Point(Cx, Cy));
CSys.SetDotLocInfor(new Point(Cx + x, Cy + y));
CSys.SetDotLocInfor(new Point(Cx - x, Cy + y));
CSys.SetDotLocInfor(new Point(Cx + x, Cy - y));
CSys.SetDotLocInfor(new Point(Cx - x, Cy - y));
CSys.SetDotLocInfor(new Point(Cx + y, Cy + x));
CSys.SetDotLocInfor(new Point(Cx - y, Cy + x));
CSys.SetDotLocInfor(new Point(Cx + y, Cy - x));
CSys.SetDotLocInfor(new Point(Cx - y, Cy - x));
}
/// <summary>
/// 开始旋转。旋转的方向为顺时针
/// </summary>
/// <param name="angle">旋转的角度</param>
public static void BeginRotate(double angle)
{
for (int i = 0; i < CSys.CellNum; i++)
{
for (int j = 0; j < CSys.CellNum; j++)
{
if (CSys.CanvasDotsArray[i, j] == 1)
{
double x = i * Math.Cos(angle) - j * Math.Sin(angle);
double y = j * Math.Cos(angle) + i * Math.Sin(angle);
CSys.SetDotLocInfor(new System.Windows.Point(Math.Floor(x), Math.Floor(y)));
}
}
}
CSys.DrawDots();
}
/// <summary>
/// 加载指定图像文件,此函数仅供内部类调用
/// </summary>
/// <param name="fileName">文件路径。如@"xx/xx/xx.bmp"</param>
private static void LoadBmpFile(string fileName)
{
Bitmap bitmap = new Bitmap(fileName);
Color color;
for (int i = 0; i < bitmap.Width; i++)
{
for (int j = 0; j < bitmap.Height; j++)
{
color = bitmap.GetPixel(i, j);
if (color.Name != "ffffffff")
{
CSys.SetDotLocInfor(new System.Windows.Point(i, j));
}
}
}
}
/// <summary>
/// Bresenham画线算法
/// </summary>
/// <param name="Sx">起点横坐标</param>
/// <param name="Sy">起点纵坐标</param>
/// <param name="Ex">终点横坐标</param>
/// <param name="Ey">终点纵坐标</param>
private static void BresenhamStraitLine(double Sx, double Sy, double Ex, double Ey)
{
double dx = Ex - Sx, dy = Ey - Sy, x = Sx, y = Sy, f = 2 * dy - dx, k = dy / dx;
CSys.SetDotLocInfor(new Point(x, y));
while (x < Ex)
{
if (f < 0)
{
f += 2 * dy;
}
else
{
f += 2 * (dy - dx);
y += k;
}
x++;
CSys.SetDotLocInfor(new Point(x, y));
}
}
/// <summary>
/// 双步画线法
/// </summary>
/// <param name="Sx">起点横坐标</param>
/// <param name="Sy">起点纵坐标</param>
/// <param name="Ex">终点横坐标</param>
/// <param name="Ey">终点纵坐标</param>
public static void TwoStepsDrawStraitLine(double Sx, double Sy, double Ex, double Ey)
{
double dx, dy, x = Sx, f, y = Sy, k;
dx = Ex - Sx;
dy = Ey - Sy;
k = dy / dx;
if (k > 0 && !double.IsInfinity(k)) //包含从左上到右下画线，右下到左上画线
{
if (dx > 0 && dy > 0) //从左上到右下画线
{
#region k>0, dy>0, dx>0
if (k > 0 && k <= 0.5)
{
f = 4 * dy - dx;
CSys.SetDotLocInfor(new Point(Sx, Sy));
while (x < Ex)
{
if (f < 0)
{
CSys.SetDotLocInfor(new Point(x + 1, y));
CSys.SetDotLocInfor(new Point(x + 2, y));
f += 4 * dy;
}
else
{
if (f < 2 * dy)
{
CSys.SetDotLocInfor(new Point(x + 1, y));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
else
{
CSys.SetDotLocInfor(new Point(x + 1, y + 1));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
f += 4 * dy - 2 * dx;
}
x += 2;
}
}
else if (k <= 1)
{
f = 4 * dy - 3 * dx;
CSys.SetDotLocInfor(new Point(Sx, Sy));
while (x < Ex)
{
if (f >= 0)
{
CSys.SetDotLocInfor(new Point(x + 1, y + 1));
CSys.SetDotLocInfor(new Point(x + 2, y + 2));
f += 4 * (dy - dx);
y += 2;
}
else
{
if (f < 2 * (dy - dx))
{
CSys.SetDotLocInfor(new Point(x + 1, y));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
else
{
CSys.SetDotLocInfor(new Point(x + 1, y + 1));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
f += 4 * dy - 2 * dx;
}
x += 2;
}
}
else//k>1
{
}
#endregion
}
else//从右下到左上画线
{
#region k>0, dy<0, dx<0
double tmpX, tmpY;
tmpX = Sx;//互换输入起点终点的横坐标
Sx = Ex;
Ex = tmpX;
tmpY = Sy;//互换输入起点终点的纵坐标
Sy = Ey;
Ey = tmpY;
dx = Ex - Sx;//重新给各个变量赋值
dy = Ey - Sy;
x = Sx;
y = Sy;
k = dy / dx;
if (k >= 0 && k <= 0.5)
{
f = 4 * dy - dx;
CSys.SetDotLocInfor(new Point(Sx, Sy));
while (x < Ex)
{
if (f < 0)
{
CSys.SetDotLocInfor(new Point(x + 1, y));
CSys.SetDotLocInfor(new Point(x + 2, y));
f += 4 * dy;
}
else
{
if (f < 2 * dy)
{
CSys.SetDotLocInfor(new Point(x + 1, y));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
else
{
CSys.SetDotLocInfor(new Point(x + 1, y + 1));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
f += 4 * dy - 2 * dx;
}
x += 2;
}
}
else if (k <= 1)
{
f = 4 * dy - 3 * dx;
CSys.SetDotLocInfor(new Point(Sx, Sy));
while (x < Ex)
{
if (f >= 0)
{
CSys.SetDotLocInfor(new Point(x + 1, y + 1));
CSys.SetDotLocInfor(new Point(x + 2, y + 2));
f += 4 * (dy - dx);
y += 2;
}
else
{
if (f < 2 * (dy - dx))
{
CSys.SetDotLocInfor(new Point(x + 1, y));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
else
{
CSys.SetDotLocInfor(new Point(x + 1, y + 1));
CSys.SetDotLocInfor(new Point(x + 2, y + 1));
y += 1;
}
f += 4 * dy - 2 * dx;
}
x += 2;
}
}
else//k>1
{
}
#endregion
}
}
else if (k < 0 && !double.IsNegativeInfinity(k)) //包含从左下到右上画线、右上到左下画线
{
if (dx > 0 && dy < 0) //从左下到右上画线
{
}
else//从右上到左下画线
{
}
}
else if (k == 0) //直线水平
{
if (Sx <= Ex) //自左往右画线
{
for (x = Sx; x < Ex; x++)
{
CSys.SetDotLocInfor(new Point(x, y));
}
}
else//自右往左画线
{
double tmpX;
tmpX = Sx;//互换输入起点终点的横坐标
Sx = Ex;
Ex = tmpX;
for (x = Sx; x < Ex; x++)
{
CSys.SetDotLocInfor(new Point(x, y));
}
}
}
else//直线竖直
{
if (Sy < Ey)//自上往下画线
{
for (y = Sy; y < Ey; y++)
{
CSys.SetDotLocInfor(new Point(x, y));
}
}
else//自下往上画线
{
double tmpY;
tmpY = Sy;//互换输入起点终点的纵坐标
Sy = Ey;
Ey = tmpY;
x = Sx;
for (y = Sy; y < Ey; y++)
{
CSys.SetDotLocInfor(new Point(x, y));
}
}
}
}