public override void Update(float time)
{
if (Target != null)
{
float xa = 0;
float xb = BezierConfig.ControlPoint1.X;
float xc = BezierConfig.ControlPoint2.X;
float xd = BezierConfig.EndPosition.X;
float ya = 0;
float yb = BezierConfig.ControlPoint1.Y;
float yc = BezierConfig.ControlPoint2.Y;
float yd = BezierConfig.EndPosition.Y;
float x = CCSplineMath.CubicBezier(xa, xb, xc, xd, time);
float y = CCSplineMath.CubicBezier(ya, yb, yc, yd, time);
CCPoint currentPos = Target.Position;
CCPoint diff = currentPos - PreviousPosition;
StartPosition = StartPosition + diff;
CCPoint newPos = StartPosition + new CCPoint(x, y);
Target.Position = newPos;
PreviousPosition = newPos;
}
}
/// <summary>
/// draws a cubic bezier path
/// @since v0.8
/// </summary>
public static void DrawCubicBezier(CCPoint origin, CCPoint control1, CCPoint control2, CCPoint destination, int segments, CCColor4B color)
{
float t = 0;
float increment = 1.0f / segments;
var vertices = new CCPoint[segments];
vertices[0] = origin;
for (int i = 1; i < segments; ++i, t += increment)
{
vertices[i].X = CCSplineMath.CubicBezier(origin.X, control1.X, control2.X, destination.X, t);
vertices[i].Y = CCSplineMath.CubicBezier(origin.Y, control1.Y, control2.Y, destination.Y, t);
}
vertices[segments - 1] = destination;
DrawPoly(vertices, color);
}
/// <summary>
/// draws a cubic bezier path
/// @since v0.8
/// </summary>
public void DrawCubicBezier(CCPoint origin, CCPoint control1, CCPoint control2, CCPoint destination, int segments, float lineWidth, CCColor4B color)
{
float t = 0;
float increment = 1.0f / segments;
var vertices = new CCPoint[segments];
vertices[0] = origin;
for (int i = 1; i < segments; ++i, t += increment)
{
vertices[i].X = CCSplineMath.CubicBezier(origin.X, control1.X, control2.X, destination.X, t);
vertices[i].Y = CCSplineMath.CubicBezier(origin.Y, control1.Y, control2.Y, destination.Y, t);
}
vertices[segments - 1] = destination;
for (int i = 0; i < vertices.Length - 1; i++)
{
DrawLine(vertices[i], vertices[i + 1], lineWidth, color);
}
//DrawPolygon(vertices, vertices.Length, color, 0, CCColor4B.Transparent);
}