/// <summary>
/// Create pie chart parts.
/// </summary>
/// <param name="segments">Pie chart segments.</param>
private void SpawnPieParts(List <PieSegment> segments)
{
Random.InitState(colourSeed);
foreach (PieSegment segment in segments)
{
// Generate random colours for each segment if random colours is enabled
if (isColourRandom)
{
segment.Color = Color.HSVToRGB(Random.value, 0.6f, .8f);
}
// Spawn pie chart parts
PieChartPart part = Instantiate(partPrefab, transform);
part.gameObject.name = segment.Name;
part.Name = segment.Name;
part.Value = segment.Value;
part.Total = totalValue;
part.Color = segment.Color;
part.Thickness = segment.Thickness;
part.Radius = segment.Radius;
// Hide empty segments
if (segment.Value == 0)
{
part.gameObject.GetComponent <Renderer>().enabled = false;
}
Debug.Assert(part.Thickness != 0.0f, $"[{name}] Segment thickness for {part.Name} is 0!");
Debug.Assert(part.Radius != 0.0f, $"[{name}] Segment radius for {part.Name} is 0!");
// Add to instantiated object list
pieParts.Add(part);
// Spawn label objects
TextMeshPro label = Instantiate(labelPrefab, transform);
label.text = segment.Value.ToString("P0");
// Add to instantiated object list
labels.Add(label);
}
// Animate pie chart if enabled
if (isAnimated)
{
animEnumerator = AnimatePieChart();
StartCoroutine(animEnumerator);
}
else
{
UpdatePie();
}
}
/// <summary>
/// Updates pie chart values and rotations.
/// </summary>
/// <param name="t">The ratio to the maximum angle in which the chart will be expanded to. [0..1]</param>
private void UpdatePie(float t = 1.0f)
{
float angle = 0.0f, prevAngle = 0.0f;
// Update each segment
for (int i = 0; i < pieParts.Count; i++)
{
// Interpolate pie chart radius
pieParts[i].Value = t * segments[i].Value;
pieParts[i].UpdateMesh();
pieParts[i].transform.localRotation = Quaternion.Euler(0.0f, angle, 0.0f);
// Next part of the pie will follow at the end of the previous pie part
angle += pieParts[i].Value / totalValue * 360.0f;
// Hide label if its value is 0
if (segments[i].Value == 0)
{
labels[i].gameObject.SetActive(false);
}
else
{
// Show object if it has non-zero value
labels[i].gameObject.SetActive(true);
// Position labels
float midPointAngle = (angle + prevAngle) / 2;
labels[i].transform.localPosition = new Vector3(
Mathf.Sin(PieChartPart.ToRad(midPointAngle)) * pieParts[i].Radius * labelRadiusRatio,
pieParts[i].Thickness,
Mathf.Cos(PieChartPart.ToRad(midPointAngle)) * pieParts[i].Radius * labelRadiusRatio)
+ labelOffset;
// Update label text
labels[i].text = pieParts[i].Value.ToString("P0");
}
// Update prevAngle
prevAngle = angle;
}
}
