/// <summary>
/// Called by the <see cref="LineDrawingTool" /> when the touch associated with this line begins on the <see cref="DrawingSurface" />.
/// </summary>
public void OnTouchBegan(DrawingSurface surface, Color color, Touch touch, LineOptions options)
{
// get position
Vector2 position = CameraUtils.TouchToWorldPoint(touch, surface.Transform, surface.Camera);
position = surface.Transform.parent.InverseTransformPoint(position);
// reset points
m_Points = m_Points ?? new LinePoint[16];
m_PointCount = 0;
m_SmoothPoints = m_SmoothPoints ?? new LinePoint[1024];
m_SmoothPointCount = 0;
// reset
m_Cap.Reset(options.Overdraw);
m_Segment.Reset(options.Overdraw);
m_Velocity.Reset(position, options.VelocityMin, options.VelocityMax, options.VelocitySmoothing);
// add point
LinePoint point = default(LinePoint);
point.Color = color;
point.Position = position;
point.Weight = Mathf.Lerp(options.WeightMin, options.WeightMax, m_Velocity.Factor);
AddPoint(point);
// set flags
m_IsDirty = true;
m_CapRequired = true;
}
/// <summary>
/// Called by the <see cref="LineDrawingTool" /> when the touch associated with this line moves on the <see cref="DrawingSurface" />.
/// </summary>
public void OnTouchMoved(DrawingSurface surface, Color color, Touch touch, LineOptions options)
{
// get position
Vector2 position = CameraUtils.TouchToWorldPoint(touch, surface.Transform, surface.Camera);
position = surface.Transform.parent.InverseTransformPoint(position);
// update
m_Velocity.Update(position);
// add point
LinePoint point = default(LinePoint);
point.Color = color;
point.Position = position;
point.Weight = Mathf.Lerp(options.WeightMin, options.WeightMax, m_Velocity.Factor);
AddPoint(point);
}
/// <summary>
/// Transforms the array of points into verts, colors and triangles and adds them to
/// the geometry object (called by the <see cref="LineDrawingTool" /> each time it
/// renders to the <see cref="DrawingSurface" />.
/// </summary>
public void OnRender(LineGeometry geometry, LineOptions options)
{
if (m_IsDirty && m_PointCount > 0)
{
// apply bezier smoothing
GenerateSmoothPoints();
int count = (m_SmoothPointCount > 0 ? m_SmoothPointCount : m_PointCount);
LinePoint[] points = (m_SmoothPointCount > 0 ? m_SmoothPoints : m_Points);
// add cap
if (m_CapRequired)
{
m_Cap.Update(points[count - 1]);
m_Cap.Apply(geometry);
}
// add points
for (int index = 1; index < count; index++)
{
// add segement
m_Segment.Update(points[index - 1], points[index - 0]);
m_Segment.Apply(geometry);
// add a cap when the direction changes
if (Vector2.Dot(m_Segment.NormalA, m_Segment.NormalB) < 0)
{
m_Cap.Update(points[index - 1]);
m_Cap.Apply(geometry);
}
}
// consume points
if (m_PointCount > 2)
{
m_Points[0] = m_Points[m_PointCount - 2];
m_Points[1] = m_Points[m_PointCount - 1];
m_PointCount = 2;
}
// clear flags
m_CapRequired = false;
m_IsDirty = false;
}
}
