| public static lerp ( Color from, Color to, float t ) : Color | ||
| from | Color | From. |
| to | Color | To. |
| t | float | T. |
| return | Color | |
/// <summary>
/// transfers the data from our segments to the vertices for display
/// </summary>
void calculateVertices()
{
if (!_areVertsDirty)
{
return;
}
var entityPosition = fixPosition == Vector2.Zero ? entity.transform.position : fixPosition;
var center = new Vector3(entityPosition, 0f);
var radVec = new Vector3(0, -ribbonRadius, 0);
// starting triangle, the head
_vertices[0].Position = center + radVec;
_vertices[0].Color = Color.Red;
_vertices[1].Position = center + radVec;
_vertices[1].Color = Color.Yellow;
_vertices[2].Position = center + radVec;
_vertices[2].Color = Color.Green;
var maxX = float.MinValue;
var minX = float.MaxValue;
var maxY = float.MinValue;
var minY = float.MaxValue;
var index = 3;
var segCount = 1;
foreach (var seg in _segments)
{
var ratio = 1 - (1 / (float)_ribbonLength * segCount);
seg.radius = ratio * ribbonRadius;
ColorExt.lerp(ref startColor, ref endColor, out _vertices[index].Color, 1 - ratio);
_vertices[index].Position = seg.topPoint;
_vertices[index + 1].Position = seg.bottomPoint;
_vertices[index + 1].Color = _vertices[index].Color;
// update min/max for any visible verts
maxX = Mathf.maxOf(maxX, _vertices[index].Position.X, _vertices[index + 1].Position.X);
minX = Mathf.minOf(minX, _vertices[index].Position.X, _vertices[index + 1].Position.X);
maxY = Mathf.maxOf(maxY, _vertices[index].Position.Y, _vertices[index + 1].Position.Y);
minY = Mathf.minOf(minY, _vertices[index].Position.Y, _vertices[index + 1].Position.Y);
// increment counters
index += 2;
segCount++;
}
_bounds.x = minX;
_bounds.y = minY;
_bounds.width = maxX - minX;
_bounds.height = maxY - minY;
_areVertsDirty = false;
}
void calculateVertices()
{
if (!_areVertsDirty || _points.length < 2)
{
return;
}
_areVertsDirty = false;
_indices.reset();
_vertices.reset();
var maxX = float.MinValue;
var minX = float.MaxValue;
var maxY = float.MinValue;
var minY = float.MaxValue;
if (_useStartEndWidths)
{
_maxWidth = System.Math.Max(_startWidth, _endWidth);
}
// calculate line length first and simulataneously get our min/max points for the bounds
var lineLength = 0f;
var halfMaxWidth = _maxWidth * 0.5f;
_points.buffer[0].lengthFromPreviousPoint = 0;
for (var i = 0; i < _points.length - 1; i++)
{
var distance = Vector2.Distance(_points.buffer[i].position, _points.buffer[i + 1].position);
_points.buffer[i + 1].lengthFromPreviousPoint = distance;
lineLength += distance;
maxX = Mathf.maxOf(maxX, _points.buffer[i].position.X + halfMaxWidth, _points.buffer[i + 1].position.X + halfMaxWidth);
minX = Mathf.minOf(minX, _points.buffer[i].position.X - halfMaxWidth, _points.buffer[i + 1].position.X - halfMaxWidth);
maxY = Mathf.maxOf(maxY, _points.buffer[i].position.Y + halfMaxWidth, _points.buffer[i + 1].position.Y + halfMaxWidth);
minY = Mathf.minOf(minY, _points.buffer[i].position.Y - halfMaxWidth, _points.buffer[i + 1].position.Y - halfMaxWidth);
}
_bounds.x = minX;
_bounds.y = minY;
_bounds.width = maxX - minX;
_bounds.height = maxY - minY;
// special case: single segment
if (_points.length == 2)
{
if (_useStartEndWidths)
{
_points.buffer[0].width = _startWidth;
_points.buffer[1].width = _endWidth;
}
if (_useStartEndColors)
{
_points.buffer[0].color = _startColor;
_points.buffer[1].color = _endColor;
}
_firstSegment.setPoints(ref _points.buffer[0], ref _points.buffer[1]);
addSingleSegmentLine(ref _firstSegment, _points.buffer[1].color);
return;
}
var distanceSoFar = 0f;
var fusedPoint = Vector2.Zero;
var vertIndex = 0;
var thirdPoint = new SegmentPoint();
for (var i = 0; i < _points.length - 1; i++)
{
var firstPoint = _points.buffer[i];
var secondPoint = _points.buffer[i + 1];
var hasThirdPoint = _points.length > i + 2;
if (hasThirdPoint)
{
thirdPoint = _points.buffer[i + 2];
}
// we need the distance along the line of both the first and second points. distanceSoFar will always be for the furthest point
// which is the previous point before adding the current segment distance.
var firstPointDistance = distanceSoFar;
distanceSoFar += secondPoint.lengthFromPreviousPoint;
var firstPointRatio = firstPointDistance / lineLength;
var secondPointRatio = distanceSoFar / lineLength;
var thirdPointRatio = 0f;
if (hasThirdPoint)
{
thirdPointRatio = (distanceSoFar + thirdPoint.lengthFromPreviousPoint) / lineLength;
}
if (_useStartEndColors)
{
ColorExt.lerp(ref _startColor, ref _endColor, out firstPoint.color, firstPointRatio);
ColorExt.lerp(ref _startColor, ref _endColor, out secondPoint.color, secondPointRatio);
if (hasThirdPoint)
{
ColorExt.lerp(ref _startColor, ref _endColor, out thirdPoint.color, thirdPointRatio);
}
}
if (_useStartEndWidths)
{
firstPoint.width = Mathf.lerp(_startWidth, _endWidth, firstPointRatio);
secondPoint.width = Mathf.lerp(_startWidth, _endWidth, secondPointRatio);
if (hasThirdPoint)
{
thirdPoint.width = Mathf.lerp(_startWidth, _endWidth, thirdPointRatio);
}
}
if (i == 0)
{
_firstSegment.setPoints(ref firstPoint, ref secondPoint);
_secondSegment.setPoints(ref secondPoint, ref thirdPoint);
}
else
{
Utils.swap(ref _firstSegment, ref _secondSegment);
if (hasThirdPoint)
{
_secondSegment.setPoints(ref secondPoint, ref thirdPoint);
}
}
// dont recalculate the fusedPoint for the last segment since there will be no third point to work with
if (hasThirdPoint)
{
var shouldFuseBottom = Vector2Ext.isTriangleCCW(firstPoint.position, secondPoint.position, thirdPoint.position);
_secondSegment.setFusedData(shouldFuseBottom, ref _firstSegment);
}
// special care needs to be take with the first segment since it has a different vert count
if (i == 0)
{
addFirstSegment(ref _firstSegment, ref _secondSegment, ref vertIndex);
}
else
{
addSegment(ref _firstSegment, ref vertIndex);
}
_lastSegment.cloneFrom(ref _firstSegment);
}
}