We Keep Coding

Drawing points along path spirally

Well, I'm trying to optimize what I did here (Smoothing noises with different amplitudes (Part 2)).
By this reason, I did a new implementation from scratch (https://youtu.be/o7pVEXhh3TI) to draw the path:
private void Start()
{
Polygon pol = File.ReadAllText(PolyPath).Deserialize<Polygon>();
// Create tex object
var list = pol.Vertices.AsEnumerable();
tex = list.CreateTextureObject(pol.Position, offset);
exampleTexture = new Texture2D(tex.Width, tex.Height);
exampleTexture.SetPixels32(new Color32[tex.Width * tex.Height]);
exampleTexture.Apply();
vertices = pol.Vertices.Select(v => (v - pol.Position) + offset).Clone().ToList();
_ss = new List<Segment>(pol.Segments.Select(s => new Segment((s.start + pol.Center - pol.Position) + offset, (s.end + pol.Center - pol.Position) + offset)));
foreach (Segment curSeg in _ss)
for (int i = -effectDistance; i < effectDistance; ++i)
{
Vector2 perp = Vector2.Perpendicular(((Vector2)curSeg.start - (Vector2)curSeg.end)).normalized;
segments.Add((Vector2)curSeg.start + perp * i);
F.DrawLine((Vector2)curSeg.start + perp * i, (Vector2)curSeg.end + perp * i, (x, y) => layers.Add(new Point(x, y)));
}
Debug.Log("Layer Count: " + layers.Count);
drawPath = true;
}
private void OnGUI()
{
if (exampleTexture == null)
return;
GUI.DrawTexture(new Rect((Screen.width - tex.Width) / 2, (Screen.height - tex.Height) / 2, tex.Width, tex.Height), exampleTexture);
if (drawPath)
{
{
Point? cur = layers.Count > 0 ? (Point?)layers.First() : null;
if (cur.HasValue)
{
exampleTexture.SetPixel(cur.Value.x, cur.Value.y, new Color32(170, 0, 0, 255));
exampleTexture.Apply();
layers.Remove(cur.Value);
}
}
{
Point? cur = segments.Count > 0 ? (Point?)segments.First() : null;
if (cur.HasValue)
{
exampleTexture.SetPixel(cur.Value.x, cur.Value.y, new Color32(0, 170, 0, 255));
exampleTexture.Apply();
segments.Remove(cur.Value);
}
}
{
Point? cur = vertices.Count > 0 ? (Point?)vertices.First() : null;
//Debug.Log(cur);
if (cur.HasValue)
{
exampleTexture.SetPixel(cur.Value.x, cur.Value.y, new Color32(255, 128, 0, 255));
exampleTexture.Apply();
vertices.Remove(cur.Value);
}
}
if (vertices.Count == 0 && segments.Count == 0 && layers.Count == 0)
drawPath = false;
}
}
This is what DrawLines actually do:
public static class F
{
public static void DrawLine(Point p1, Point p2, Action<int, int> action)
{
DrawLine(p1.x, p1.y, p2.x, p2.y, action);
}
public static void DrawLine(int x0, int y0, int x1, int y1, Action<int, int> action)
{
int sx = 0,
sy = 0;
int dx = Mathf.Abs(x1 - x0),
dy = Mathf.Abs(y1 - y0);
if (x0 < x1) { sx = 1; } else { sx = -1; }
if (y0 < y1) { sy = 1; } else { sy = -1; }
int err = dx - dy,
e2 = 0;
while (true)
{
action?.Invoke(x0, y0);
if ((x0 == x1) && (y0 == y1))
break;
e2 = 2 * err;
if (e2 > -dy)
{
err = err - dy;
x0 = x0 + sx;
}
if (e2 < dx)
{
err = err + dx;
y0 = y0 + sy;
}
}
}
}
This is an implemenentation of Bresenham algorithm.
This implementation is better because I have lowered iterations from 280k to 6k, but there is an issue as you can see this is innacurate...
The way this works first is getting the perpendicular of each segment on the shape (green pixels) and then drawing lines between the start and the end point of that segment. Segmenents are obtained using Ramer-Douglas-Peucker algorithm.
So I was thinking on draw the "orange" path spirally. I don't know how to explain this, basically, obtaining the same path but, with an scale (Translating/transforming? list of points from its center with an offset/distance) but I think I will have the same innacuracy.
Any guide will be appreciated. What algorithm could I use to draw the path with "layers"?

Following some of the information here, you might be able to use "inward/outward polygon offsetting" (aka "polygon buffering") to get the result you are interested in.
A tool such as Clipper can help.
Once you have a way to outwardly offset your shape, do the following:
First, draw the outer shape (black region below), then offset the inner shape outwards as far as you need it to go, and draw it on top of the outer shape (brown region below) using an appropriate noise/color scheme:
Then, apply a smaller offset, then draw that shape on top using a different noise/colorscheme (orange region below).
Repeat until you have as many gradients as you need:
Finally, draw the inner shape without any offsetting with its noise/color scheme:

Get List<Segment> from a PathGeometry

I draw in a canvas several shapes. I have two kinds of shapes : Ellipse, and Path.
Now when I make a click on my Canvas, I want to get the nearest Shape.
I could manage to do something for Ellipse, but for Path I don't manage to find how to get its coordinates.
Here is the code I use to generate a List, in case something is not optimum in that method :
Concretely, "percage" are drillings, if Type=12, it means I draw a slot(Path). else I draw a circle(Ellipse)
if (percage.Type == 12)
{
double r = percage.Diametre / 2;
LineSegment ligne1 = new LineSegment();
LineSegment ligne2 = new LineSegment();
Point ptCentre = new Point(dx + percage.Coor_X, this.MyScrollViewer.ActualHeight * echelle - dy - percage.Coor_Y);
double angle = percage.AnglePer;
double xLeft = ptCentre.X - r;
double xRight = ptCentre.X + r;
double yUp = ptCentre.Y - ((percage.Longueur / 2) - r);
double yDown = ptCentre.Y + ((percage.Longueur / 2) - r);
Point pt1 = new Point(xLeft, yUp);
Point pt2 = new Point(xRight, yUp);
Point pt3 = new Point(xRight, yDown);
Point pt4 = new Point(xLeft, yDown);
pt1 = Global.RotatePoint(pt1, ptCentre, angle - 90);
pt2 = Global.RotatePoint(pt2, ptCentre, angle - 90);
pt3 = Global.RotatePoint(pt3, ptCentre, angle - 90);
pt4 = Global.RotatePoint(pt4, ptCentre, angle - 90);
Path arc_path1 = new Path();
arc_path1.Stroke = Brushes.Red;
arc_path1.StrokeThickness = 2;
PathGeometry pathGeometry = new PathGeometry();
ArcSegment arc1 = new ArcSegment();
ArcSegment arc2 = new ArcSegment();
PathFigure pathfigure1 = new PathFigure();
PathFigure pathfigure2 = new PathFigure();
arc1.Point = new Point(pt2.X, pt2.Y);
arc1.Point = new Point(pt4.X, pt4.Y);
pathfigure1.StartPoint = new Point(pt1.X, pt1.Y);
pathfigure1.StartPoint = new Point(pt3.X, pt3.Y);
SweepDirection sd = SweepDirection.Counterclockwise;
if (yUp < yDown)
{
sd = SweepDirection.Clockwise;
}
arc1.Size = new Size(r, r);
arc1.SweepDirection = sd;
arc2.Size = new Size(r, r);
arc2.SweepDirection = sd;
arc1.Point = pt2;
arc2.Point = pt4;
ligne1.Point = new Point(pt3.X, pt3.Y);
ligne2.Point = new Point(pt1.X, pt1.Y);
pathfigure1.StartPoint = new Point(pt1.X, pt1.Y);
pathfigure1.Segments.Add(arc1);
pathfigure1.Segments.Add(ligne1);
pathfigure1.Segments.Add(arc2);
pathfigure1.Segments.Add(ligne2);
pathGeometry.Figures.Add(pathfigure1);
arc_path1.Data = pathGeometry;
arc_path1.Tag = percage;
percage.ListShapes.Add(arc_path1);
}
else
{
Ellipse ellipse = new Ellipse();
ellipse.Stroke = System.Windows.Media.Brushes.Red;
ellipse.StrokeThickness = 1;
ellipse.Fill = new System.Windows.Media.SolidColorBrush(System.Windows.Media.Colors.Red);
ellipse.Width = percage.Diametre;
ellipse.Height = percage.Diametre;
percage.Coor_X_Graph = X1 + dx - (percage.Diametre / 2);
percage.Coor_Y_Graph = this.MyScrollViewer.ActualHeight * echelle - (Y1 + dy) - (percage.Diametre / 2);
ellipse.Margin = new System.Windows.Thickness(percage.Coor_X_Graph, percage.Coor_Y_Graph, 0, 0);
ellipse.Tag = percage;
percage.ListShapes.Add(ellipse);
}
Then, to get the nearest shape, I began that code :
For ellipse I can retrieve its coordinates, but for Path, couldn't find the List of Segments inside.
StartPoint = e.GetPosition(monDessin);
double distance=-1;
Shape selectedShape = null;
for (int i = monDessin.Children.Count - 1; i > -1; i--)
{
if (monDessin.Children[i] is Ellipse)
{
Ellipse ell = (Ellipse)monDessin.Children[i];
double x = ell.Margin.Left + Width / 2;
double y = ell.Margin.Top - ell.Height / 2;
double dist = Math.Sqrt((StartPoint.X - x) * (StartPoint.X - x) + (StartPoint.Y -y) * (StartPoint.Y - y));
if(distance==-1 || dist<distance)
{
distance = dist;
}
}
else if(monDessin.Children[i] is Path)
{
Path path=(Path)monDessin.Children[i];
Geometry geometry = path.Data;
foreach(PathFigure pf in ?????)
}
}

Finally, I could do it myself looking a bit more on internet (not sure it is the best way as I began on that theme,so any other suggestion is welcome)
I found some "solution" here
But the code didn't work, got an error on the following line (without understand why, neither what it does)
string value = seralizer.ConvertToString(geomerty, null);
Finally I adapted it looking on msdn website, I found geometry.GetOutlinedPathGeometry() and pathGeometry.Figures that allowed to get list of figures. I just don't understand why all my ArcSegment became BezierSegment.
Anyway, it works fine, so I put here the code :
StartPoint = e.GetPosition(monDessin);
double distance=-1;
double dist;
Shape selectedShape = null;
for (int i = monDessin.Children.Count - 1; i > -1; i--)
{
string type = monDessin.Children[i].GetType().ToString();
if (monDessin.Children[i] is Ellipse)
{
Ellipse ell = (Ellipse)monDessin.Children[i];
double x = ell.Margin.Left + ell.Width / 2;
double y = ell.Margin.Top - ell.Height / 2;
dist = Math.Sqrt((StartPoint.X - x) * (StartPoint.X - x) + (StartPoint.Y -y) * (StartPoint.Y - y));
if(distance==-1 || dist<distance)
{
distance = dist;
}
}
else if(monDessin.Children[i] is Path)
{
Path path=(Path)monDessin.Children[i];
string titi = path.Tag.GetType().ToString();
Geometry geometry = path.Data;
PathGeometry pathGeometry = geometry.GetOutlinedPathGeometry();
PathFigureCollection figures = pathGeometry.Figures;
if (figures != null)
{
foreach (PathFigure figure in figures)
{
foreach (PathSegment segment in figure.Segments)
{
//first syntax : if(segment is LineSegment)
if(segment is LineSegment)
{
LineSegment lineSegment = (LineSegment)segment;
double x = lineSegment.Point.X;
ouble y = lineSegment.Point.Y;
}
//2nd syntax :
//ArcSegment arcSegment = segment as ArcSegment;
//Then check if not null
ArcSegment arcSegment = segment as ArcSegment;
if (arcSegment != null)
{
double x = arcSegment.Point.X;
double y = arcSegment.Point.Y;
dist = Math.Sqrt((StartPoint.X - x) * (StartPoint.X - x) + (StartPoint.Y - y) * (StartPoint.Y - y));
if (distance == -1 || dist < distance)
{
distance = dist;
}
}
BezierSegment bezierSegment = segment as BezierSegment;
if (bezierSegment != null)
{
double x = bezierSegment.Point3.X;
double y = bezierSegment.Point3.Y;
dist = Math.Sqrt((StartPoint.X - x) * (StartPoint.X - x) + (StartPoint.Y - y) * (StartPoint.Y - y));
if (distance == -1 || dist < distance)
{
distance = dist;
}
}
}
}
}
}
}
Nota : I found two different syntaxes to check the type of segment(i.e LineSegment), I don't know which is the best approach, the first syntax seems better, but the 2nd one has the advantage to check if it is null(even if in theory it may never happen???)

Position controls on a circle

I am trying to spread panels (9 in my example) on a circle that I have drawn.
I am using c# winforms.
I have tried many variations of my code but I'm not getting what I want and started to get confused.
Eventually I want something like that:
I am not really sure how to put the center of my panels on the corresponding points on the circle using the angles.
Here's my code:
public partial class Form1 : Form
{
List<Panel> plist = new List<Panel>();
Rectangle circ_rect = new Rectangle();
const int Num_Screens = 9;
const int margin = 15;
public Form1()
{
InitializeComponent();
WindowState = FormWindowState.Maximized;
}
private void Generate_Panels()
{
for (int i = 0; i < 9; i++)
{
Panel p = new Panel();
p.BackColor = Color.LightSkyBlue;
p.Size = new Size(250, 150);
p.BorderStyle = BorderStyle.FixedSingle;
p.Name = "panel_" + ((i + 1).ToString());
plist.Add(p);
}
}
private void Generate_Circle()
{
//Create panels
Generate_Panels();
//Set circle coord
Point circ_center = new Point(Width / 2, Height / 2);
Size circ_Size = new Size(Height - margin, Height - margin);
circ_center = new Point((circ_center.X - (circ_Size.Width / 2)),
(circ_center.Y - (circ_Size.Height / 2)));
circ_rect = new Rectangle(circ_center, circ_Size);
float radius = circ_Size.Width / 2;
float angle = 0.0f;
Point loc = Point.Empty;
Point rect_center = Point.Empty;
for (int i = 0; i < plist.Count; i++)
{
rect_center = new Point((plist[i].Width / 2), (plist[i].Height / 2));
angle = 360 * ((i + 1f) / 9);
loc.X = (int)(radius * Math.Cos(angle * Math.PI / 180)) + circ_center.X;
loc.Y = (int)(radius * Math.Sin(angle * Math.PI / 180)) + circ_center.Y;
plist[i].Location = new Point(loc.X - (plist[i].Width / 2) + circ_rect.X,
loc.Y - (plist[i].Height / 2) + circ_rect.Y);
this.Controls.Add(plist[i]);
}
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
e.Graphics.DrawEllipse(Pens.Red, circ_rect);
}
private void Form1_Load(object sender, EventArgs e)
{
Generate_Circle();
}
}

Having r as radius of a circle with center of (0,0) in a Cartesian coordinate system, we can calculate coordinate of a on the circle based on the angle:
x = r * cos(degree) and y = r * sin(degree)
In C# Sin and Cos methods, accept radians, so we should convert degree to radians using the following formula.
radians = Math.PI * degree / 180.0
The next step is converting the Cartesian coordinate system values to the form coordinate values:
panel.X = x + center.X - panel.Width/2
panel.Y = center.Y - y - panel.Height/2
The next step is calculating the angles. You can set angles manually or you can calculate them by setting an angle as start angle (like 90) and adding a value (like 40, 360/count) as step to the angles.
Example
public partial class Form1 : Form {
Rectangle circle;
List<Panel> panels;
List<int> angles;
public Form1() {
InitializeComponent();
ResizeRedraw = true;
angles = Enumerable.Range(0, 9).Select(x => 90 + x * 40).ToList();
panels = Enumerable.Range(0, 9).Select(x => new Panel() {
Size = new Size(100, 40),
BackColor = Color.LightSkyBlue
}).ToList();
this.Controls.AddRange(panels.ToArray());
}
protected override void OnLayout(LayoutEventArgs levent) {
base.OnLayout(levent);
int padding = 50;
int radius = Math.Min(ClientSize.Width, ClientSize.Height) / 2 - padding;
Point center = new Point(ClientSize.Width / 2, ClientSize.Height / 2);
circle = new Rectangle(center.X - radius, center.Y - radius,
2 * radius, 2 * radius);
for (int i = 0; i < 9; i++) {
var x = (int)(radius * Math.Cos(Math.PI * angles[i] / 180.0)) + center.X;
var y = center.Y - (int)(radius * Math.Sin(Math.PI * angles[i] / 180.0));
panels[i].Left = x - (panels[i].Width / 2);
panels[i].Top = y - (panels[i].Height / 2);
}
}
protected override void OnPaint(PaintEventArgs e) {
base.OnPaint(e);
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.DrawEllipse(Pens.Red, circle);
}
}

I converted a CSV file to shapefile, but can't create its projection

I tried to convert a csv file to shapefile with its projection. Conversion works but I can't create the .prj file.
The error says that
"there is no source code available for current location".
My code is as follows:
public Form1() {
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e) {
AxMap axMap1 = new AxMap();
Shapefile sf = new Shapefile();
bool result = sf.CreateNewWithShapeID("", ShpfileType.SHP_POLYGON);
if (!result) {
MessageBox.Show(sf.get_ErrorMsg(sf.LastErrorCode));
} else {
double xMin = 0.0;
double yMin = 0.0;
double xMax = 1000.0;
double yMax = 1000.0;
Random rnd = new Random(DateTime.Now.Millisecond);
int fldX = sf.EditAddField("x", FieldType.DOUBLE_FIELD, 9, 12);
int fldY = sf.EditAddField("y", FieldType.DOUBLE_FIELD, 9, 12);
int fldArea = sf.EditAddField("area", FieldType.DOUBLE_FIELD, 9, 12);
// In a loop we are creating 100 different points using the box established above.
for (int i = 0; i < 100; i++) {
if (i % 10 == 0) {
Shape shp1 = new Shape();
shp1.Create(ShpfileType.SHP_POLYGON);
sf.EditInsertShape(shp1, ref i);
} else {
double xCenter = xMin + (xMax - xMin) * rnd.NextDouble();
double yCenter = yMin + (yMax - yMin) * rnd.NextDouble();
// random radius from 10 to 100
double radius = 10 + rnd.NextDouble() * 90;
// polygons must be clockwise
Shape shp = new Shape();
shp.Create(ShpfileType.SHP_POLYGON);
for (int j = 0; j < 37; j++) {
Point pnt = new Point();
pnt.x = xCenter + radius * Math.Cos(j * Math.PI / 18);
pnt.y = yCenter - radius * Math.Sin(j * Math.PI / 18);
shp.InsertPoint(pnt, ref j);
}
sf.EditInsertShape(shp, ref i);
sf.EditCellValue(fldX, i, xCenter.ToString());
sf.EditCellValue(fldY, i, yCenter.ToString());
sf.EditCellValue(fldArea, i, Math.PI * radius * radius);
}
}
axMap1.CreateControl();
axMap1.AddLayer(sf, true);
axMap1.ZoomToLayer(0);
sf.Categories.Generate(fldArea, tkClassificationType.ctNaturalBreaks, 7);
ColorScheme scheme = new ColorScheme();
scheme.SetColors2(tkMapColor.Wheat, tkMapColor.Salmon); sf.Categories.ApplyColorScheme(tkColorSchemeType.ctSchemeGraduated, scheme);
axMap1.Redraw();
sf.SaveAs(#"D:\shp1\polygons.shp", null);
sf.Open("D:\\shp1\\polygons.shp");
sf.Projection = (DotSpatial.Projections.KnownCoordinateSystems.Projected.UtmWgs1984.WGS1984UTMZone32N).ToString();
sf.SaveAs(#"D:\shp1\polygons.prj");
}
}

ERROR XNA Framework VertexBuffer IndexBuffer usage

I am creating a game after working through a XNA 4.0 book. It will be 3D, but I am already stuck in creating the terrain...
UPDATE: Everything starting from here is an update...
Terrain Update:
public void Update(Matrix view, Matrix projection)
{
View = view;
Projection = projection;
World = Matrix.CreateTranslation(-Width / 2f, 0, Height / 2f);
}
Terrain Draw:
public void Draw(GraphicsDevice g)
{
effect.CurrentTechnique = effect.Techniques["ColoredNoShading"];
effect.Parameters["xView"].SetValue(View);
effect.Parameters["xProjection"].SetValue(Projection);
effect.Parameters["xWorld"].SetValue(World);
foreach (EffectPass pass in effect.CurrentTechnique.Passes)
{
pass.Apply();
//g.DrawUserIndexedPrimitives(PrimitiveType.TriangleList, vertices, 0, vertices.Length, indices, 0, indices.Length / 3, VertexPositionColorNormal.VertexDeclaration);
g.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, vertices.Length, 0, indices.Length / 3);
}
}
The commented line is working, in the both cases I am able to see the terrain...
The following code is to initialize Vertex and Index Buffer:
private void SetUpVertices(GraphicsDevice g)
{
float currentH;
int currentI;
vertices = new VertexPositionColorNormal[Width * Height];
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
currentH = heightData[x,y];
currentI = x + y * Width;
vertices[currentI].Position = new Vector3(x, currentH , -y);
if (currentH < minH + (maxH - minH) / 3)
vertices[currentI].Color = Color.ForestGreen;
else if (currentH < maxH - (maxH - minH) / 3)
vertices[currentI].Color = Color.LawnGreen;
else
vertices[currentI].Color = Color.White;
}
}
SetUpIndices(g);
}
private void SetUpIndices(GraphicsDevice g)
{
indices = new int[(Width - 1) * (Height - 1) * 6];
int counter = 0;
for (int y = 0; y < Height - 1; y++)
{
for (int x = 0; x < Width - 1; x++)
{
int lowerLeft = x + y * Width;
int lowerRight = (x + 1) + y * Width;
int topLeft = x + (y + 1) * Width;
int topRight = (x + 1) + (y + 1) * Width;
indices[counter++] = topLeft;
indices[counter++] = lowerRight;
indices[counter++] = lowerLeft;
indices[counter++] = topLeft;
indices[counter++] = topRight;
indices[counter++] = lowerRight;
}
}
SetUpNormals(g);
}
private void SetUpNormals(GraphicsDevice g)
{
for (int i = 0; i < vertices.Length; i++)
{
vertices[i].Normal = Vector3.Zero;
}
int[] index = new int[3];
Vector3 s1, s2, n;
for (int i = 0; i < vertices.Length / 3; i++)
{
for (int y = 0; y < 3; y++)
index[y] = indices[i * 3 + y];
s1 = vertices[index[0]].Position - vertices[index[2]].Position;
s2 = vertices[index[0]].Position - vertices[index[1]].Position;
n = Vector3.Cross(s1, s2);
for (int y = 0; y < 3; y++)
{
vertices[index[y]].Normal += n;
vertices[index[y]].Normal.Normalize();
}
}
FillBuffers(g);
}
private void FillBuffers(GraphicsDevice g)
{
VertexBuffer = new VertexBuffer(g, VertexPositionColorNormal.VertexDeclaration, vertices.Length, BufferUsage.WriteOnly);
VertexBuffer.SetData(vertices);
IndexBuffer = new IndexBuffer(g, typeof(int), indices.Length, BufferUsage.WriteOnly);
IndexBuffer.SetData(indices);
g.Indices = IndexBuffer;
g.SetVertexBuffer(VertexBuffer);
}
I don't think, that there is a mistake, because it is working with the other line. Might there be an error with the .fx file I am using. If you think so, I am going to switch to BasicEffects...
(You might notice, that the code is from http://www.riemers.net/eng/Tutorials/XNA/Csharp/series1.php )
Thanks for your help...
Yours,
Florian

(Answer to original revision of the question.)
You're not setting your vertex buffer and index buffer onto the graphics device. These two lines of code (untested) should do what you need:
g.GraphicsDevice.Indices = indexBuffer;
g.GraphicsDevice.SetVertexBuffer(vertexBuffer);
Place them just after you set the parameters on your effect (ef), before the loop.
The vertex buffer provides the vertex declaration that the exception message is asking for.
Edit after question update: In your new version you're setting the vertex and index buffers - but it's in the wrong place. You need to set them onto the graphics device each frame. Your code would only work if nothing changes them after you set them in FillBuffers. But I'm guessing that stuff is being drawn outside your class's Draw method?
If that something else is a SpriteBatch, even it works using vertex buffers and index buffers. So it will reset your settings. (It's worth adding that it also sets render states - in which case you might need to see this article.)