| public static Dot ( Vector2 value1, Vector2 value2 ) : float | ||
| value1 | Vector2 | Source vector. |
| value2 | Vector2 | Source vector. |
| return | float | |
public float DistanceToSquared(ref Vector3 vector, out Segment connectingSegment)
{
float segmentLength = (float)this.GetLength();
Vector2 normalizedLine = new Vector2(
(float)(Point2.X - Point1.X) / segmentLength,
(float)(Point2.Y - Point1.Y) / segmentLength);
Vector2 pointVector = new Vector2((float)(vector.X - Point1.X), (float)(vector.Y - Point1.Y));
float length = Vector2.Dot(pointVector, normalizedLine);
if (length < 0)
{
connectingSegment.Point1 = new Point(ref vector);
connectingSegment.Point2 = Point1;
return((float)connectingSegment.GetLengthSquared());
}
else if (length > segmentLength)
{
connectingSegment.Point1 = new Point(ref vector);
connectingSegment.Point2 = Point2;
return((float)connectingSegment.GetLengthSquared());
}
else
{
connectingSegment.Point1 = new Point(ref vector);
connectingSegment.Point2 = new Point(Point1.X + length * normalizedLine.X,
Point1.Y + length * normalizedLine.Y);
return((float)connectingSegment.GetLengthSquared());
}
}
public float DistanceTo(double x, double y)
{
float segmentLength = (float)this.GetLength();
Vector2 normalizedLine = new Vector2(
(float)(Point2.X - Point1.X) / segmentLength,
(float)(Point2.Y - Point1.Y) / segmentLength);
Vector2 pointVector = new Vector2((float)(x - Point1.X), (float)(y - Point1.Y));
float length = Vector2.Dot(pointVector, normalizedLine);
if (length < 0)
{
return((float)(new Segment(x, y, Point1.X, Point1.Y).GetLength()));
}
else if (length > segmentLength)
{
return((float)(new Segment(x, y, Point2.X, Point2.Y).GetLength()));
}
else
{
normalizedLine.X *= length;
normalizedLine.Y *= length;
float xDistanceSquared = pointVector.X - normalizedLine.X;
xDistanceSquared = xDistanceSquared * xDistanceSquared;
float yDistanceSquared = pointVector.Y - normalizedLine.Y;
yDistanceSquared = yDistanceSquared * yDistanceSquared;
return((float)System.Math.Sqrt(xDistanceSquared + yDistanceSquared));
}
}
public Point ClosestPointTo(Point point)
{
Vector2 unitSegment = new Vector2((float)(this.Point2.X - this.Point1.X), (float)(Point2.Y - Point1.Y));
unitSegment.Normalize();
Vector2 pointVector = new Vector2((float)(point.X - this.Point1.X), (float)(point.Y - Point1.Y));
// Segment pointSegment = new Segment( new Point(0,0),
// new Point(point.x - this.Point1.X, point.y - Point1.Y));
float l = Vector2.Dot(pointVector, unitSegment);
if (l < 0)
{
return(this.Point1);
}
else if (l * l > this.GetLengthSquared())
{
return(this.Point2);
}
else
{
Point newPoint = new Point(Point1.X + l * unitSegment.X, Point1.Y + l * unitSegment.Y);
return(newPoint);
}
}
/// <summarY>
/// Draws the map
/// </summarY>
/// <param name="map">The map to draw</param>
/// <param name="camera">The position to draw from</param>
/// <param name="orientation">The rotation to draw from in degrees</param>
public void RenderMap(SpriteBatch spriteBatch, Map map, Vector2 camera, float orientation, int cellSize,
string wallsLayer)
{
TmxMap mapData = map.Data;
int slices = viewport.Width;
float halfFov = FOV / 2;
float focalLength = slices / 2 / (float)Math.Tan(halfFov);
float cameraAngle = orientation * (float)(Math.PI / 180.0f);
float sliceAngle = FOV / slices;
float beginAngle = cameraAngle - halfFov;
// draw ceiling and floor
spriteBatch.Draw(blankTexture, new Rectangle(0, 0, viewport.Width, viewport.Height / 2),
Color.FromNonPremultiplied(23, 14, 8, 255));
spriteBatch.Draw(blankTexture, new Rectangle(0, viewport.Height / 2, viewport.Width, viewport.Height / 2),
Color.DarkKhaki);
// draw all wallslices
for (int x = 0; x < slices; x++)
{
float angle = beginAngle + x * sliceAngle;
RayCaster.HitData castData;
if (!RayCaster.RayIntersectsGrid(camera, angle, cellSize, out castData,
map.GetIsTileOccupiedFunction(wallsLayer)))
{
continue;
}
// get the texture slice
int tileIndex = (int)(castData.tileCoordinates.Y * mapData.Width + castData.tileCoordinates.X);
TmxLayer wallLayer = mapData.Layers[wallsLayer];
TmxLayerTile tile = wallLayer.Tiles[tileIndex];
TmxTileset tileset = map.GetTilesetForTile(tile);
if (tileset == null)
{
continue;
}
// fix fisheye for distance and get slice height
float distance = (float)(castData.rayLength * Math.Cos(angle - cameraAngle));
int sliceHeight = (int)(cellSize * focalLength / distance);
zBuffer[x] = distance;
// get drawing rectangles
Rectangle wallRectangle = new Rectangle(x, viewport.Height / 2 - sliceHeight / 2, 1, sliceHeight);
Rectangle textureRectangle = map.GetSourceRectangleForTile(tileset, tile);
textureRectangle.X =
(int)(textureRectangle.X + (textureRectangle.Width * castData.cellFraction) % cellSize);
textureRectangle.Width = 1;
// get texture tint
float dot = Vector2.Dot(castData.normal, Vector2.UnitY);
Color lightingTint = Math.Abs(dot) > 0.9f ? Color.Gray : Color.White;
spriteBatch.Draw(map.Textures[tileset], wallRectangle, textureRectangle, lightingTint);
}
}
/// <summary>
/// Determines whether the closest point on the segment lies on one of the endpoints.
/// </summary>
/// <param name="point">The point to test to.</param>
/// <returns>Whether the closest point on this segment to the argument point lies on the endpoints.</returns>
#endregion
public bool IsClosestPointOnEndpoint(ref Point point)
{
sUnitSegmentForIsClosestPointOnEndpoint.X = (float)(this.Point2.X - this.Point1.X);
sUnitSegmentForIsClosestPointOnEndpoint.Y = (float)(Point2.Y - Point1.Y);
sUnitSegmentForIsClosestPointOnEndpoint.Normalize();
sPointVectorForIsClosestPointOnEndpoint.X = (float)(point.X - this.Point1.X);
sPointVectorForIsClosestPointOnEndpoint.Y = (float)(point.Y - Point1.Y);
#if FRB_MDX
float l = Vector2.Dot(sPointVectorForIsClosestPointOnEndpoint, sUnitSegmentForIsClosestPointOnEndpoint);
#else
float l;
Vector2.Dot(ref sPointVectorForIsClosestPointOnEndpoint, ref sUnitSegmentForIsClosestPointOnEndpoint, out l);
#endif
return(l < 0 || l * l > this.GetLengthSquared());
}
private void DrawVector(SpriteBatch spriteBatch, IGameObject sprite, int borderSize, Color borderColor)
{
// Calculate line size and angle
var sr = sprite.GetComponent <SpriteRenderer>();
var rb = sprite.GetComponent <Rigidbody>();
Vector2 vv = new Vector2(rb.velocity.X, rb.velocity.Y);
Vector2 begin = new Vector2(sprite.Transform.Position.X, sprite.Transform.Position.Y);
Vector2 end = begin + vv;
Rectangle r = new Rectangle((int)begin.X, (int)begin.Y, (int)(end - begin).Length() + borderSize, borderSize);
Vector2 v = Vector2.Normalize(begin - end);
float angle = (float)Math.Acos(Vector2.Dot(v, -Vector2.UnitX));
if (begin.Y > end.Y)
{
angle = MathHelper.TwoPi - angle;
}
// Calculate text and background sizes
Vector2 XtextSize = _spriteFont.MeasureString("X:" + (int)vv.X);
Vector2 YtextSize = _spriteFont.MeasureString("Y:" + (int)vv.Y);
int maxWidth = (int)XtextSize.X;
if (YtextSize.X > maxWidth)
{
maxWidth = (int)YtextSize.X;
}
Rectangle textSize = new Rectangle((int)end.X - maxWidth / 2, (int)end.Y - (int)XtextSize.Y + 4,
maxWidth + 4, (int)XtextSize.Y + 9);
// Draw vector line and component values
spriteBatch.Draw(_pixel, r, null, borderColor, angle, Vector2.Zero, SpriteEffects.None, 0.0002f);
if (ShowVectorPositionLabels)
{
spriteBatch.DrawString(_spriteFont, "X:" + (int)vv.X, new Vector2(textSize.X + 2, end.Y - 12), Color.White, 0, Vector2.Zero, 1f, SpriteEffects.None, 0);
spriteBatch.DrawString(_spriteFont, "Y:" + (int)vv.Y, new Vector2(textSize.X + 2, end.Y - 2), Color.White, 0, Vector2.Zero, 1f, SpriteEffects.None, 0);
// Draw text background
spriteBatch.Draw(_consoleWindow, textSize, null, Color.White, 0, Vector2.Zero, SpriteEffects.None, 0.0001f);
}
}
/// <summary>
/// Returns the distance to the argument point as well as
/// the connectin Vector3 from the Point to this.
/// </summary>
/// <param name="point">The point to get the distance to.</param>
/// <param name="connectingVector">The connecting vector from the argument Pointn to this.</param>
/// <returns>The distance between this and the argument Point.</returns>
#endregion
public float DistanceTo(Point point, out Vector3 connectingVector)
{
connectingVector = new Vector3();
float segmentLength = (float)GetLength();
Vector2 normalizedLine = new Vector2(
(float)(Point2.X - Point1.X) / segmentLength,
(float)(Point2.Y - Point1.Y) / segmentLength);
Vector2 pointVector = new Vector2((float)(point.X - Point1.X), (float)(point.Y - Point1.Y));
float length = Vector2.Dot(pointVector, normalizedLine);
if (length < 0)
{
connectingVector.X = (float)(Point1.X - point.X);
connectingVector.Y = (float)(Point1.Y - point.Y);
connectingVector.Z = 0;
return(connectingVector.Length());
}
else if (length > segmentLength)
{
connectingVector.X = (float)(Point2.X - point.X);
connectingVector.Y = (float)(Point2.Y - point.Y);
connectingVector.Z = 0;
return(connectingVector.Length());
}
else
{
Point tempPoint = new Point(Point1.X + length * normalizedLine.X,
Point1.Y + length * normalizedLine.Y);
connectingVector.X = (float)(tempPoint.X - point.X);
connectingVector.Y = (float)(tempPoint.Y - point.Y);
connectingVector.Z = 0;
return(connectingVector.Length());
}
}
/// <summary>
/// Draws the sprite
/// </summary>
/// <param name="spriteBatch">batch to draw sprites with</param>
/// <param name="position">position of the sprite</param>
/// <param name="texture">texture to draw</param>
/// <param name="camera">camera position</param>
/// <param name="orientation">camera angle in degrees</param>
public void RenderSprite(SpriteBatch spriteBatch, Vector2 position, Texture2D texture, Rectangle source,
Vector2 camera, float orientation)
{
int slices = viewport.Width;
int halfSlice = slices / 2;
float halfFov = FOV / 2;
float cameraAngle = orientation * (float)(Math.PI / 180.0f);
float focalLength = halfSlice / (float)Math.Tan(halfFov);
Vector2 cameraForward = new Vector2((float)Math.Cos(cameraAngle), (float)Math.Sin(cameraAngle));
Vector2 spriteCameraSpace = position - camera;
if (Vector2.Dot(cameraForward, spriteCameraSpace) <= 0)
{
return;
}
float angleToSprite = (float)Math.Atan2(spriteCameraSpace.Y, spriteCameraSpace.X) - cameraAngle;
float correctedDistance = (float)(spriteCameraSpace.Length() * Math.Cos(angleToSprite));
int spriteSize = (int)(source.Width * focalLength / correctedDistance);
int spritePosition = (int)(Math.Tan(angleToSprite) * focalLength + halfSlice);
// draw slices for sprite
int halfSprite = spriteSize / 2;
int startPosition = spritePosition - halfSprite;
int endPosition = spritePosition + halfSprite;
int tileStart = source.X;
if (endPosition < 0 || startPosition >= slices)
{
return;
}
if (startPosition < 0)
{
startPosition = 0;
}
bool noOffsetNeeded = false;
if (endPosition >= slices)
{
endPosition = slices - 1;
noOffsetNeeded = true;
}
int spriteSizeRange = endPosition - startPosition;
float spritePart = source.Width / (float)spriteSize;
float sourceOffset = noOffsetNeeded ? 0 : source.Width - spriteSizeRange / (float)spriteSize * source.Width;
source.Width = (int)Math.Ceiling(spritePart);
for (int x = 0; x < spriteSizeRange; x++)
{
int screenColumn = startPosition + x;
if (zBuffer[screenColumn] < correctedDistance)
{
continue;
}
source.X = tileStart + (int)(sourceOffset + x * spritePart);
spriteBatch.Draw(texture,
new Rectangle(screenColumn, viewport.Height / 2 - halfSprite, 1, spriteSize),
source, Color.White);
}
}
public static double dot_product(Vector2 point1, Vector2 point2)
{
return(ApplyEpsilon(point1.Dot(point2)));
}
