public void ZigZagTest()
{
var value = ZigZag.Encode(874534L);
var result = ZigZag.Decode(value);
NUnit.Framework.Assert.AreEqual(874534L, result);
}
public void EncodeVertexBuffer(VertexData vData)
{
// ZigZag Encode Buffer. The quantizing of data I guess
ushort _u;
ushort _v;
ushort _height;
ushort prev_u = 0;
ushort prev_v = 0;
ushort prev_height = 0;
for (int i = 0; i < vData.u.Length; i++)
{
// work out delta of current value minus prev value and encode
_u = (ushort)ZigZag.Encode(vData.u[i] - prev_u);
_v = (ushort)ZigZag.Encode(vData.v[i] - prev_v);
_height = (ushort)ZigZag.Encode(vData.height[i] - prev_height);
prev_u = vData.u[i];
prev_v = vData.v[i];
prev_height = vData.height[i];
vData.u[i] = _u;
vData.v[i] = _v;
vData.height[i] = _height;
}
}
public void Encode()
{
Assert.Equal(1, ZigZag.Encode(-1));
Assert.Equal(2, ZigZag.Encode(1));
Assert.Equal(3, ZigZag.Encode(-2));
Assert.Equal(4, ZigZag.Encode(2));
}
public void ZigZagTest()
{
ulong value = ZigZag.Encode(874534L);
long result = ZigZag.Decode(value);
Xunit.Assert.Equal(874534L, result);
}
private static List <uint> EncodePointGeometry(List <List <PointInt> > coordList)
{
List <uint> geometry = new List <uint>();
PointInt prevCoord = new PointInt()
{
X = 0, Y = 0
};
foreach (List <PointInt> points in coordList)
{
if (points.Count == 0)
{
throw new Exception("Encoding with no points. ");
}
uint commandInteger = (MoveTo & 0x7) | ((uint)points.Count << 3);
geometry.Add(commandInteger);
for (int n = 0; n < points.Count; ++n)
{
int dx = points[n].X - prevCoord.X;
int dy = points[n].Y - prevCoord.Y;
int parameter = ZigZag.Encode(dx);
geometry.Add((uint)parameter);
parameter = ZigZag.Encode(dy);
geometry.Add((uint)parameter);
prevCoord = points[n];
}
}
return(geometry);
}
private void WriteZigZag(ModuleDefinition module, ILProcessor worker, TypeReference fieldType)
{
var useLong = fieldType.Is <long>();
var encode = useLong
? module.ImportReference((long v) => ZigZag.Encode(v))
: module.ImportReference((int v) => ZigZag.Encode(v));
worker.Append(worker.Create(OpCodes.Call, encode));
}
public void TestZigZagEncode()
{
// arrange
const int inputVar = -2;
// act
var res = ZigZag.Encode(inputVar);
// assert
Assert.IsTrue(res == 3);
}
private static List <uint> EncodePolygonGeometry(List <List <PointInt> > coordList)
{
List <uint> geometry = new List <uint>();
PointInt prevCoord = new PointInt()
{
X = 0, Y = 0
};
foreach (List <PointInt> points in coordList)
{
if (points.Count == 0)
{
throw new Exception("Encoding with no points. ");
}
//start of ring
uint commandInteger = (MoveTo & 0x7) | (1 << 3);
geometry.Add(commandInteger);
int dx = points[0].X - prevCoord.X;
int dy = points[0].Y - prevCoord.Y;
int parameter = ZigZag.Encode(dx);
geometry.Add((uint)parameter);
parameter = ZigZag.Encode(dy);
geometry.Add((uint)parameter);
bool lastPointRepeated = (points[points.Count - 1].X == points[0].X && points[points.Count - 1].Y == points[0].Y);
int pointCount = lastPointRepeated ? points.Count - 2 : points.Count - 1;
//encode the rest of the points
commandInteger = (LineTo & 0x7) | ((uint)(pointCount) << 3);
geometry.Add(commandInteger);
for (int n = 1; n <= pointCount; ++n)
{
dx = points[n].X - points[n - 1].X;
dy = points[n].Y - points[n - 1].Y;
parameter = ZigZag.Encode(dx);
geometry.Add((uint)parameter);
parameter = ZigZag.Encode(dy);
geometry.Add((uint)parameter);
}
//close path
commandInteger = (ClosePath & 0x7) | (1 << 3);
geometry.Add(commandInteger);
prevCoord = points[pointCount];
}
return(geometry);
}
public void EncodeZigZag()
{
var e64_1 = ZigZag.Encode((long)1);
var e64_2 = ZigZag.Encode(-1L);
var e32_1 = ZigZag.Encode(1);
var e32_2 = ZigZag.Encode(-1);
NUnit.Framework.Assert.AreEqual((uint)2, e32_1);
NUnit.Framework.Assert.AreEqual((uint)1, e32_2);
NUnit.Framework.Assert.AreEqual((ulong)2, e64_1);
NUnit.Framework.Assert.AreEqual((ulong)1, e64_2);
}
public void EncodeZigZag()
{
ulong e64_1 = ZigZag.Encode((long)1);
ulong e64_2 = ZigZag.Encode(-1L);
uint e32_1 = ZigZag.Encode(1);
uint e32_2 = ZigZag.Encode(-1);
Xunit.Assert.Equal((uint)2, e32_1);
Xunit.Assert.Equal((uint)1, e32_2);
Xunit.Assert.Equal((ulong)2, e64_1);
Xunit.Assert.Equal((ulong)1, e64_2);
}
private static List <uint> EncodeLineGeometry(List <List <PointInt> > coordList)
{
List <uint> geometry = new List <uint>();
PointInt prevCoord = new PointInt()
{
X = 0, Y = 0
};
foreach (List <PointInt> points in coordList)
{
if (points.Count == 0)
{
throw new Exception("Encoding with no points. ");
}
//start of linestring
uint commandInteger = (MoveTo & 0x7) | (1 << 3);
geometry.Add(commandInteger);
int dx = points[0].X - prevCoord.X;
int dy = points[0].Y - prevCoord.Y;
int parameter = ZigZag.Encode(dx);
geometry.Add((uint)parameter);
parameter = ZigZag.Encode(dy);
geometry.Add((uint)parameter);
//encode the rest of the points
commandInteger = (LineTo & 0x7) | ((uint)(points.Count - 1) << 3);
geometry.Add(commandInteger);
for (int n = 1; n < points.Count; ++n)
{
dx = points[n].X - points[n - 1].X;
dy = points[n].Y - points[n - 1].Y;
parameter = ZigZag.Encode(dx);
geometry.Add((uint)parameter);
parameter = ZigZag.Encode(dy);
geometry.Add((uint)parameter);
}
prevCoord = points[points.Count - 1];
}
return(geometry);
}
private void button2_Click_1(object sender, EventArgs e)
{
ushort _u;
ushort _v;
ushort _height;
ushort prev_u = 0;
ushort prev_v = 0;
ushort prev_height = 0;
VertexData vData = new VertexData(1, 1);
int k = 0;
// vData.AddVertex(k, 0, 0, ConvertRange(0,200,16384));
vData.AddVertex(k, 0, 0, 16384);
k = 1;
vData.AddVertex(k, 0, 32767, 0);
k = 2;
vData.AddVertex(k, 32767, 0, 32767);
k = 3;
vData.AddVertex(k, 32767, 32767, 6384);
for (int i = 0; i < vData.u.Length; i++)
{
listBox1.Items.Add($"uvh{i}: {vData.u[i]}, {vData.v[i]}, {vData.height[i]}");
}
listBox1.Items.Add($"Enccode");
for (int i = 0; i < vData.u.Length; i++)
{
// work out delta of current value minus prev value and encode
_u = (ushort)ZigZag.Encode(vData.u[i] - prev_u);
_v = (ushort)ZigZag.Encode(vData.v[i] - prev_v);
_height = (ushort)ZigZag.Encode(vData.height[i] - prev_height);
prev_u = vData.u[i];
prev_v = vData.v[i];
prev_height = vData.height[i];
vData.u[i] = _u;
listBox1.Items.Add($"uvh{i}: {_u}, {_v}, {_height}");
vData.v[i] = _v;
vData.height[i] = _height;
}
listBox1.Items.Add($"Decode");
//Decode
// now decode deltas and place true value back into array
_u = 0;
_v = 0;
_height = 0;
for (int i = 0; i < 4; i++)
{
_u += (ushort)ZigZag.Decode(vData.u[i]);
_v += (ushort)ZigZag.Decode(vData.v[i]);
_height += (ushort)ZigZag.Decode(vData.height[i]);
vData.u[i] = _u;
listBox1.Items.Add($"uvh{i}: {_u}, {_v}, {_height}");
vData.v[i] = _v;
vData.height[i] = _height;
}
}
