/// <summary>
/// Instead of calculating something logically, this function instead just draws an entire new segment with every pair of points.
/// This means that there are several orders of magnitude more vertices than necessary, but it's mathematically easy (for me).
/// </summary>
public static void Line(List <Vector2> positions, VertexHelper vh, float radius, Color color)
{
var segmentCount = positions.Count - 1;
if (segmentCount < 1)
{
return;
}
var vertexIndex = vh.currentVertCount;
var circlePoints = Constants.CIRCLE_RESOLUTION;
var capPoints = circlePoints / 2 + 1;
for (int i = 0; i < segmentCount; i++)
{
var from = positions[i];
var to = positions[i + 1];
var angle = Mathf.Atan2(from.y - to.y, from.x - to.x);
var fromAngle = angle - Mathf.PI / 2f;
var toAngle = angle + Mathf.PI / 2f;
var fromIndex = vh.currentVertCount;
vh.AddVert(MeshHelper.Vertex(from, color));
for (int j = 0; j < capPoints; j++)
{
var offset = new Vector2(
Mathf.Cos(fromAngle + j * 2 * Mathf.PI / circlePoints),
Mathf.Sin(fromAngle + j * 2 * Mathf.PI / circlePoints));
vh.AddVert(MeshHelper.Vertex(from + radius * offset, color));
}
for (int j = 0; j < capPoints; j++)
{
vh.AddTriangle(
vertexIndex,
vertexIndex + (j) % (capPoints) + 1,
vertexIndex + (j + 1) % (capPoints) + 1);
}
vertexIndex = vh.currentVertCount;
var toIndex = vh.currentVertCount;
vh.AddVert(MeshHelper.Vertex(to, color));
for (int j = 0; j < capPoints; j++)
{
var offset = new Vector2(
Mathf.Cos(toAngle + j * 2 * Mathf.PI / circlePoints),
Mathf.Sin(toAngle + j * 2 * Mathf.PI / circlePoints));
vh.AddVert(MeshHelper.Vertex(to + radius * offset, color));
}
for (int j = 0; j < capPoints; j++)
{
vh.AddTriangle(
vertexIndex,
vertexIndex + (j) % (capPoints) + 1,
vertexIndex + (j + 1) % (capPoints) + 1);
}
vh.AddTriangle(toIndex, fromIndex + 1, fromIndex);
vh.AddTriangle(toIndex, toIndex + capPoints, fromIndex + 1);
vh.AddTriangle(fromIndex, toIndex + 1, toIndex);
vh.AddTriangle(fromIndex, fromIndex + capPoints, toIndex + 1);
}
}
