public static CreateVertexColor ( byte r, byte g, byte b, byte a ) : |
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r | byte | |
g | byte | |
b | byte | |
a | byte | |
리턴 |
/// <summary> /// Multiplies a range of alpha values with a certain factor. /// </summary> public void ScaleAlphaBy(float factor, int index, int numVertices) { if (index < 0 || index >= _numVertices) { throw new IndexOutOfRangeException("Invalid vertex index"); } if (factor == 1.0f) { return; } int minAlpha = _premultipliedAlpha ? (int)(MIN_ALPHA * 255.0f) : 0; for (int i = index; i < index + numVertices; ++i) { VertexColor vertexColor = _vertexColors[i]; byte newAlpha = Convert.ToByte(NumberUtil.Clamp(vertexColor.A * factor, minAlpha, 255)); if (_premultipliedAlpha) { vertexColor = VertexColorHelper.UnmultiplyAlpha(vertexColor); vertexColor.A = newAlpha; _vertexColors[i] = VertexColorHelper.PremultiplyAlpha(vertexColor); } else { _vertexColors[i] = VertexColorHelper.CreateVertexColor(vertexColor.R, vertexColor.G, vertexColor.B, newAlpha); } } }
/// <summary> /// Updates the color of a vertex. The method always expects non-premultiplied alpha values. /// </summary> public void SetColor(uint color, float alpha, int atIndex) { if (atIndex < 0 || atIndex >= _numVertices) { throw new IndexOutOfRangeException("Invalid vertex index"); } alpha = NumberUtil.Clamp(alpha, _premultipliedAlpha ? MIN_ALPHA : 0.0f, 1.0f); VertexColor vertexColor = VertexColorHelper.CreateVertexColor(color, alpha); _vertexColors[atIndex] = _premultipliedAlpha ? VertexColorHelper.PremultiplyAlpha(vertexColor) : vertexColor; }