public SpriteRenderItem(VertexPosition3ColorTexture topLeft, VertexPosition3ColorTexture topRight, VertexPosition3ColorTexture bottomLeft, VertexPosition3ColorTexture bottomRight, Texture2D texture)
{
TopLeft = topLeft;
TopRight = topRight;
BottomLeft = bottomLeft;
BottomRight = bottomRight;
Texture = texture;
}
public void Draw(Texture2D texture, Vector2 position, IntRect?sourceRectangle, RgbaFloat color, float rotation, Vector2 origin, Vector2 scale, float depth)
{
var actualOrigin = origin * scale;
float w;
float h;
Vector2 texCoordsTL;
Vector2 texCoordsBR;
if (sourceRectangle.HasValue)
{
var sourceRect = sourceRectangle.GetValueOrDefault();
w = sourceRect.Width * scale.X;
h = sourceRect.Height * scale.Y;
float wF = 1f / texture.Width;
float hF = 1f / texture.Height;
texCoordsTL = new Vector2(sourceRect.Left * wF, sourceRect.Top * hF);
texCoordsBR = new Vector2(sourceRect.Right * wF, sourceRect.Bottom * hF);
}
else
{
w = texture.Width * scale.X;
h = texture.Height * scale.Y;
texCoordsTL = Vector2.Zero;
texCoordsBR = Vector2.One;
}
Vector2 posTL;
Vector2 posTR;
Vector2 posBL;
Vector2 posBR;
if (rotation == 0f)
{
float x = position.X - actualOrigin.X;
float y = position.Y - actualOrigin.Y;
posTL = new Vector2(x, y);
posTR = new Vector2(x + w, y);
posBL = new Vector2(x, y + h);
posBR = new Vector2(x + w, y + h);
}
else
{
float rotSin = (float)Math.Sin(rotation);
float rotCos = (float)Math.Cos(rotation);
float dx = -actualOrigin.X;
float dy = -actualOrigin.Y;
posTL = new Vector2(
position.X + (dx * rotCos) - (dy * rotSin),
position.Y + (dx * rotSin) - (dy * rotCos));
posTR = new Vector2(
position.X + ((dx + w) * rotCos) - (dy * rotSin),
position.Y + ((dx + w) * rotSin) - (dy * rotCos));
posBL = new Vector2(
position.X + (dx * rotCos) - ((dy + h) * rotSin),
position.Y + (dx * rotSin) - ((dy + h) * rotCos));
posBR = new Vector2(
position.X + ((dx + w) * rotCos) - ((dy + h) * rotSin),
position.Y + ((dx + w) * rotSin) - ((dy + h) * rotCos));
}
var vertexTL = new VertexPosition3ColorTexture(new Vector3(posTL, depth), color, texCoordsTL);
var vertexTR = new VertexPosition3ColorTexture(new Vector3(posTR, depth), color, new Vector2(texCoordsBR.X, texCoordsTL.Y));
var vertexBL = new VertexPosition3ColorTexture(new Vector3(posBL, depth), color, new Vector2(texCoordsTL.X, texCoordsBR.Y));
var vertexBR = new VertexPosition3ColorTexture(new Vector3(posBR, depth), color, texCoordsBR);
var sprite = new SpriteRenderItem(vertexTL, vertexTR, vertexBL, vertexBR, texture);
sprites.Add(sprite);
}
