public Material Update(Parameters parms, IScaler scaler, Vector2 range, List <float> entries = null)
{
if (m_ScaleMaterial == null)
{
var circularGraduationMaterial = Resources.Load <Material>("Materials/CircularGraduation");
Assert.IsNotNull(circularGraduationMaterial);
m_ScaleMaterial = new Material(circularGraduationMaterial);
m_ScaleMaterial.hideFlags = HideFlags.DontSave;
}
UpdateShaderUniforms(m_ScaleMaterial, parms);
if (m_ScaleTexture == null)
{
// TODO: have buffer size match its circular projection in screen space.
m_ScaleTexture = new Texture2D(k_ScaleResolution, 1, TextureFormat.Alpha8, false); // TODO use Alpha8
m_ScaleTexture.filterMode = FilterMode.Bilinear;
m_ScaleTexture.hideFlags = HideFlags.HideAndDontSave;
}
for (var i = 0; i < k_ScaleResolution; ++i)
{
s_ScalePixels[i] = 0;
}
if (entries != null)
{
foreach (var val in entries)
{
var angle = scaler.ValueToAngle(range.x, range.y, parms.angularRange, val);
var normalized = (parms.angularRange - angle) / (parms.angularRange * 2);
RenderPoint(s_ScalePixels, normalized, parms.entryLineWidth, 1);
}
}
if (Math.Abs(parms.scaleDensityHint) > Mathf.Epsilon)
{
RenderScale(s_ScalePixels, parms, scaler, range, 0.5f);
}
m_ScaleTexture.LoadRawTextureData(s_ScalePixels);
m_ScaleTexture.Apply();
m_ScaleMaterial.SetTexture(k_ShaderScaleTex, m_ScaleTexture);
return(m_ScaleMaterial);
}
static void RenderScale(byte[] target, Parameters parms, IScaler scaler, Vector2 range, float intensity)
{
var delta = Math.Abs(range.y - range.x) / Mathf.Max(1, parms.scaleDensityHint); // value delta between two points.
// Find power of 10 above ptValDelta.
var gradDelta = Mathf.Pow(10, Mathf.Ceil(Mathf.Log(delta) / Mathf.Log(10)));
// Subdivide that power of 10 to get closer to target.
while (gradDelta > 2 * delta)
{
gradDelta *= 0.5f;
}
var pos = Mathf.Ceil(range.x / gradDelta) * gradDelta;
do
{
var angle = scaler.ValueToAngle(range.x, range.y, parms.angularRange, pos);
var normalized = (parms.angularRange - angle) / (parms.angularRange * 2);
RenderPoint(target, normalized, parms.lineWidth, intensity);
pos += gradDelta;
}while (pos < range.y);
}