/// <summary>
/// This function computes the z-coord by a given x and y position.
/// </summary>
/// <param name="x">x position</param>
/// <param name="y">y position</param>
/// <param name="z">z position to return</param>
/// <returns>True/False if the z position was found</returns>
public bool GetZ(float x, float y, out float z)
{
try
{
point2D delta;
point3D point1, point2, point3, point4;
ushort mx = (ushort)Math.Ceiling((float)((x - this.info.location[0]) / this.info.scale[0]) + (this.info.size / 2));
ushort my = (ushort)Math.Ceiling((float)((y - this.info.location[1]) / this.info.scale[1]) + (this.info.size / 2));
if (mx >= this.info.size || my >= this.info.size)
{
z = 0;
return(false);
}
point1.x = (float)((mx - (this.info.size / 2)) * this.info.scale[0]) + this.info.location[0];
point1.y = (float)((my - (this.info.size / 2)) * this.info.scale[1]) + this.info.location[1];
point1.z = (float)(this.HeightData[mx, my] * this.info.scale[2]) + this.info.location[2];
mx -= 1;
point2.x = (float)((mx - (this.info.size / 2)) * this.info.scale[0]) + this.info.location[0];
point2.y = (float)((my - (this.info.size / 2)) * this.info.scale[1]) + this.info.location[1];
point2.z = (float)(this.HeightData[mx, my] * this.info.scale[2]) + this.info.location[2];
my -= 1;
point3.x = (float)((mx - (this.info.size / 2)) * this.info.scale[0]) + this.info.location[0];
point3.y = (float)((my - (this.info.size / 2)) * this.info.scale[1]) + this.info.location[1];
point3.z = (float)(this.HeightData[mx, my] * this.info.scale[2]) + this.info.location[2];
mx += 1;
point4.x = (float)((mx - (this.info.size / 2)) * this.info.scale[0]) + this.info.location[0];
point4.y = (float)((my - (this.info.size / 2)) * this.info.scale[1]) + this.info.location[1];
point4.z = (float)(this.HeightData[mx, my] * this.info.scale[2]) + this.info.location[2];
delta.x = point1.x - x;
delta.y = point1.y - y;
if (delta.x >= delta.y) //use 1,2,3
{
z = (float)HeightMap.z(point1.x, point1.y, point1.z, point2.x, point2.y, point2.z, point3.x, point3.y, point3.z, x, y) + z_correction;
}
else //use 1,3,4
{
z = (float)HeightMap.z(point1.x, point1.y, point1.z, point3.x, point3.y, point3.z, point4.x, point4.y, point4.z, x, y) + z_correction;
}
return(true);
}
catch (IndexOutOfRangeException)
{
z = 0;
return(false);
}
}
