/// <summary>
/// Initializes mesh with new value.
/// Unless the heightmap is small, it won't all fit into a single MeshBuffer.
/// This function chops it into pieces and generates a buffer from each one.
/// </summary>
public void Init(VideoDriver driver, HeightMap map, float s, ColorFunc cf)
{
width = map.Width;
height = map.Height;
scale = s;
if (Mesh.MeshBufferCount > 0)
{
Mesh.RemoveMeshBuffer(0, Mesh.MeshBufferCount);
}
int sw = 0xffff / (height + 1); // maximum vertices per meshbuffer
for (int y0 = 0; y0 < height; y0 += sw)
{
int y1 = y0 + sw;
if (y1 >= height)
{
y1 = height - 1; // the last one might be narrower
}
addStrip(map, cf, y0, y1);
}
Mesh.SetDirty();
Mesh.RecalculateBoundingBox();
}
private void ChangeStrokeBrush(object sender, EventArgs e)
{
if (this.updateattribute)
{
ISvgBrush brush1 = this.graphStroke.Brush;
if (brush1 is SvgElement)
{
// SvgElement element1 = (SvgElement) brush1;
string text1 = CodeFunc.CreateString(base.OwnerDocument, ((SvgElement)brush1).Name);
if ((this.ParentNode != null) && (((SvgElement)brush1).ParentNode == null))
{
AttributeFunc.SetAttributeValue((SvgElement)brush1, "id", text1);
AttributeFunc.SetAttributeValue(this, "stroke", "url(#" + text1 + ");");
base.OwnerDocument.AddDefsElement((SvgElement)brush1);
}
else
{
this.svgAttributes["stroke"] = this.graphStroke;
this.svgAnimAttributes["stroke"] = this.graphStroke;
}
}
else if (brush1 == null)
{
AttributeFunc.SetAttributeValue(this, "stroke", "none");
}
else
{
AttributeFunc.SetAttributeValue(this, "stroke", ColorFunc.GetColorString(((SolidColor)brush1).Color));
AttributeFunc.SetAttributeValue(this, "stroke-opacity", ((SolidColor)brush1).Opacity.ToString());
}
}
}
/// <summary>
/// Generates a MeshBuffer which represents all the vertices and indices for values of y
/// between y0 and y1, and add it to the mesh.
/// </summary>
void addStrip(HeightMap map, ColorFunc cf, int y0, int y1)
{
Vertex3D[] vertices = new Vertex3D[(y1 - y0 + 1) * width];
ushort[] indices = new ushort[(y1 - y0) * (width - 1) * 6]; // "6" is a number of indices in 2 triangles (which forms a quad)
// calculate vertices
int i = 0;
for (int y = y0; y <= y1; ++y)
{
for (int x = 0; x < width; ++x)
{
float z = map.GetHeight(x, y);
float xf = (float)x / (float)width;
float yf = (float)y / (float)height;
vertices[i++] = new Vertex3D(
new Vector3Df(x, scale * z, y), // position
map.GetNormal(x, y, scale), // normal
calculate(cf, xf, yf, z), // color
new Vector2Df(xf, yf) // tcoords
);
}
}
// calculate indices
i = 0;
for (int y = y0; y < y1; ++y)
{
for (int x = 0; x < width - 1; ++x)
{
int n = (y - y0) * width + x;
indices[i++] = (ushort)n;
indices[i++] = (ushort)(n + width);
indices[i++] = (ushort)(n + width + 1);
indices[i++] = (ushort)(n + width + 1);
indices[i++] = (ushort)(n + 1);
indices[i++] = (ushort)n;
}
}
// append calculated verices and indices to mesh buffer
MeshBuffer buf = MeshBuffer.Create(VertexType.Standard, IndexType._16Bit); // create new buffer
Mesh.AddMeshBuffer(buf);
buf.Append(vertices, indices);
buf.RecalculateBoundingBox();
buf.Drop();
}
/// <summary>
/// Calculates single color value for given coordinates.
/// </summary>
Color calculate(ColorFunc cf, float x, float y, float z)
{
switch (cf)
{
case ColorFunc.GreyscaleBasedOnTheHeight:
int n = (int)(255.0f * z);
return(new Color(n, n, n));
case ColorFunc.CoordinateInterpolation:
return(new Color(128 + (int)(127.0f * x), 128 + (int)(127.0f * y), 255));
case ColorFunc.PureWhite:
return(Color.SolidWhite);
default:
throw new ArgumentException("Unexpected color function value: " + cf.ToString());
}
}
/// <summary>
/// Calculates single color value for given coordinates.
/// </summary>
Color calculate(ColorFunc cf, float x, float y, float z)
{
switch (cf)
{
case ColorFunc.GreyscaleBasedOnTheHeight:
int n = (int)(255.0f * z);
return new Color(n, n, n);
case ColorFunc.CoordinateInterpolation:
return new Color(128 + (int)(127.0f * x), 128 + (int)(127.0f * y), 255);
case ColorFunc.PureWhite:
return Color.OpaqueWhite;
default:
throw new ArgumentException("Unexpected color function value: " + cf.ToString());
}
}
/// <summary>
/// Generates a MeshBuffer which represents all the vertices and indices for values of y
/// between y0 and y1, and add it to the mesh.
/// </summary>
void addStrip(HeightMap map, ColorFunc cf, int y0, int y1)
{
Vertex3D[] vertices = new Vertex3D[(y1 - y0 + 1) * width];
ushort[] indices = new ushort[(y1 - y0) * (width - 1) * 6]; // "6" is a number of indices in 2 triangles (which forms a quad)
// calculate vertices
int i = 0;
for (int y = y0; y <= y1; ++y)
{
for (int x = 0; x < width; ++x)
{
float z = map.GetHeight(x, y);
float xf = (float)x / (float)width;
float yf = (float)y / (float)height;
vertices[i++] = new Vertex3D(
new Vector3Df(x, scale * z, y), // position
map.GetNormal(x, y, scale), // normal
calculate(cf, xf, yf, z), // color
new Vector2Df(xf, yf) // tcoords
);
}
}
// calculate indices
i = 0;
for (int y = y0; y < y1; ++y)
{
for (int x = 0; x < width - 1; ++x)
{
int n = (y - y0) * width + x;
indices[i++] = (ushort)n;
indices[i++] = (ushort)(n + width);
indices[i++] = (ushort)(n + width + 1);
indices[i++] = (ushort)(n + width + 1);
indices[i++] = (ushort)(n + 1);
indices[i++] = (ushort)n;
}
}
// append calculated verices and indices to mesh buffer
MeshBuffer buf = MeshBuffer.Create(VertexType.Standard, IndexType._16Bit); // create new buffer
Mesh.AddMeshBuffer(buf);
buf.Append(vertices, indices);
buf.RecalculateBoundingBox();
buf.Drop();
}
/// <summary>
/// Initializes mesh with new value.
/// Unless the heightmap is small, it won't all fit into a single MeshBuffer.
/// This function chops it into pieces and generates a buffer from each one.
/// </summary>
public void Init(VideoDriver driver, HeightMap map, float s, ColorFunc cf)
{
width = map.Width;
height = map.Height;
scale = s;
if (Mesh.MeshBufferCount > 0)
Mesh.RemoveMeshBuffer(0, Mesh.MeshBufferCount);
int sw = 0xffff / (height + 1); // maximum vertices per meshbuffer
for (int y0 = 0; y0 < height; y0 += sw)
{
int y1 = y0 + sw;
if (y1 >= height)
y1 = height - 1; // the last one might be narrower
addStrip(map, cf, y0, y1);
}
Mesh.RecalculateBoundingBox();
}
