//------------------------------------------------------
// Get Animation Data
//------------------------------------------------------
// Perform Bezier interpolation between the key frames
private float bezierInterpolation(KeyFrame previous_frame, KeyFrame next_frame, float current_time)
{
BezierCurveCubic temp_bezier = new BezierCurveCubic();
temp_bezier.StartAnchor = new Vector2(previous_frame.time, previous_frame.data);
temp_bezier.FirstControlPoint = previous_frame.bezier_values.Zw;
temp_bezier.SecondControlPoint = next_frame.bezier_values.Xy;
temp_bezier.EndAnchor = new Vector2(next_frame.time, next_frame.data);
return(temp_bezier.CalculatePoint(current_time).Y);
}
public static TweenFunc <float> CubicBezier(float mx1, float my1, float mx2, float my2)
{
var curve = new BezierCurveCubic(
new Vector2(0f, 0f),
new Vector2(1f, 1f),
new Vector2(mx1, my1),
new Vector2(mx2, my2)
);
return((from, to, t) => {
return from + (to - from) * curve.CalculatePoint(t).Y;
});
}
public static List <Vector2> nsvg__pathArcTo(Vector2d start, ArcTo a2)
{
List <Vector2> ret = new List <Vector2>();
Vector2d end = start;
// Ported from canvg (https://code.google.com/p/canvg/)
double rx, ry, rotx;
double x1, y1, x2, y2, cx, cy, dx, dy, d;
double x1p, y1p, cxp, cyp, s, sa, sb;
double ux, uy, vx, vy, a1, da;
double x, y, tanx, tany, a, px = 0, py = 0, ptanx = 0, ptany = 0;
double[] t = new double[6];
double sinrx, cosrx;
bool fa, fs;
int ndivs;
double hda, kappa;
rx = Math.Abs(a2.Radius.Width);
ry = Math.Abs(a2.Radius.Height);
rotx = a2.xrotation / 180.0f * Math.PI; // x rotation engle
fa = a2.LargeArc;
fs = a2.SweepClockwise;
x1 = start.X; // start point
y1 = start.Y;
x2 = a2.EndPoint.X;
y2 = a2.EndPoint.Y;
dx = x1 - x2;
dy = y1 - y2;
d = Math.Sqrt(dx * dx + dy * dy);
if (d < 1e-6f || rx < 1e-6f || ry < 1e-6f)
{
// The arc degenerates to a line
//nsvg__lineTo(p, x2, y2);
end.X = x2;
end.Y = y2;
ret.Add((Vector2)end);
return(ret);
}
sinrx = Math.Sin(rotx);
cosrx = Math.Cos(rotx);
// Convert to center point parameterization.
// http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
// 1) Compute x1', y1'
x1p = cosrx * dx / 2.0f + sinrx * dy / 2.0f;
y1p = -sinrx * dx / 2.0f + cosrx * dy / 2.0f;
d = sqr(x1p) / sqr(rx) + sqr(y1p) / sqr(ry);
if (d > 1)
{
d = Math.Sqrt(d);
rx *= d;
ry *= d;
}
// 2) Compute cx', cy'
s = 0.0f;
sa = sqr(rx) * sqr(ry) - sqr(rx) * sqr(y1p) - sqr(ry) * sqr(x1p);
sb = sqr(rx) * sqr(y1p) + sqr(ry) * sqr(x1p);
if (sa < 0.0f)
{
sa = 0.0f;
}
if (sb > 0.0f)
{
s = Math.Sqrt(sa / sb);
}
if (fa == fs)
{
s = -s;
}
cxp = s * rx * y1p / ry;
cyp = s * -ry * x1p / rx;
// 3) Compute cx,cy from cx',cy'
cx = (x1 + x2) / 2.0f + cosrx * cxp - sinrx * cyp;
cy = (y1 + y2) / 2.0f + sinrx * cxp + cosrx * cyp;
// 4) Calculate theta1, and delta theta.
ux = (x1p - cxp) / rx;
uy = (y1p - cyp) / ry;
vx = (-x1p - cxp) / rx;
vy = (-y1p - cyp) / ry;
a1 = nsvg__vecang(1.0, 0.0, ux, uy); // Initial angle
da = nsvg__vecang(ux, uy, vx, vy); // Delta angle
// if (nsvg__vecrat(ux,uy,vx,vy) <= -1.0f) da = Math.PI;
// if (nsvg__vecrat(ux,uy,vx,vy) >= 1.0f) da = 0;
if (fa)
{
// Choose large arc
if (da > 0.0f)
{
da = da - 2 * Math.PI;
}
else
{
da = 2 * Math.PI + da;
}
}
// Approximate the arc using cubic spline segments.
t[0] = cosrx;
t[1] = sinrx;
t[2] = -sinrx;
t[3] = cosrx;
t[4] = cx;
t[5] = cy;
// Split arc into max 90 degree segments.
// The loop assumes an iteration per end point (including start and end), this +1.
ndivs = (int)(Math.Abs(da) / (Math.PI * 0.5f) + 1.0f);
hda = (da / (double)ndivs) / 2.0f;
kappa = Math.Abs(4.0f / 3.0f * (1.0f - Math.Cos(hda)) / Math.Sin(hda));
if (da < 0.0f)
{
kappa = -kappa;
}
var last = (Vector2)start;
for (int i = 0; i <= ndivs; i++)
{
a = a1 + da * (i / (double)ndivs);
dx = Math.Cos(a);
dy = Math.Sin(a);
nsvg__xformPoint(out x, out y, dx * rx, dy * ry, t); // position
nsvg__xformVec(out tanx, out tany, -dy * rx * kappa, dx * ry * kappa, t); // tangent
if (i > 0)
{
BezierCurveCubic b = new BezierCurveCubic((Vector2)last, new Vector2((float)x, (float)y),
(Vector2) new Vector2d(px + ptanx, py + ptany),
(Vector2) new Vector2d(x - tanx, y - tany));
Vector2 old = b.CalculatePoint(0f);
ret.Add(old);
var precision = 0.05f;
for (float p = precision; p < 1f + precision; p += precision)
{
Vector2 j = b.CalculatePoint(p);
ret.Add(j);
}
last = b.CalculatePoint(1.0f);
}
px = x;
py = y;
ptanx = tanx;
ptany = tany;
}
end.X = x2;
end.Y = y2;
ret.Add((Vector2)end);
return(ret);
}
public void DrawPath(Path path, VBO vbo)
{
List <List <Vector2> > shapes = new List <List <Vector2> >();
List <Vector2> positions = new List <Vector2>();
List <Vector2> tesselated = new List <Vector2>();
Point position = new Point();
foreach (var op in path.Operations)
{
var mt = op as MoveTo;
if (mt != null)
{
shapes.Add(positions);
positions = new List <Vector2>();
positions.Add(Vec2(mt.Point));
position = mt.Point;
continue;
}
var lt = op as LineTo;
if (lt != null)
{
positions.Add(Vec2(lt.Point));
position = lt.Point;
continue;
}
var at = op as ArcTo;
if (at != null)
{
var p = nsvg.nsvg__pathArcTo((Vector2d)Vec2(position), at);
positions.AddRange(p);
position = at.Point;
continue;
}
var ct = op as CurveTo;
if (ct != null)
{
if (double.IsNaN(ct.Control1.X) && double.IsNaN(ct.Control1.Y))
{
BezierCurveQuadric b = new BezierCurveQuadric(Vec2(position), Vec2(ct.EndPoint),
Vec2(ct.Control2));
Vector2 old = b.CalculatePoint(0f);
positions.Add(old);
var precision = 0.05f;
for (float i = precision; i < 1f + precision; i += precision)
{
Vector2 j = b.CalculatePoint(i);
positions.Add(j);
old = j;
}
}
else
{
BezierCurveCubic b = new BezierCurveCubic(Vec2(position), Vec2(ct.EndPoint), Vec2(ct.Control1),
Vec2(ct.Control2));
Vector2 old = b.CalculatePoint(0f);
positions.Add(old);
var precision = 0.05f;
for (float i = precision; i < 1f + precision; i += precision)
{
Vector2 j = b.CalculatePoint(i);
positions.Add(j);
}
}
position = ct.EndPoint;
}
var cp = op as ClosePath;
if (cp != null)
{
if (positions.Count > 0)
{
positions.Add(positions[0]);
shapes.Add(positions);
}
positions = new List <Vector2>();
position = new Point();
continue;
}
}
shapes.Add(positions);
brushcheck(path.Brush);
LibTessDotNet.Tess t = new LibTessDotNet.Tess();
List <Vec3> vertices = new List <Vec3>();
foreach (var s in shapes)
{
ContourVertex[] cv = new ContourVertex[s.Count];
for (int i = 0; i < s.Count; i++)
{
var v = s[i];
cv[i] = new ContourVertex()
{
Position = new Vec3()
{
X = v.X, Y = v.Y
}
};
}
t.AddContour(cv);
}
var rule = LibTessDotNet.WindingRule.NonZero;
if (path.Brush != null)
{
rule = path.Brush.FillMode == FillMode.EvenOdd ? LibTessDotNet.WindingRule.EvenOdd : LibTessDotNet.WindingRule.NonZero;
}
t.Tessellate(rule, LibTessDotNet.ElementType.Polygons, 3);
for (var i = 0; i < t.ElementCount; i++)
{
for (var tri = 0; tri < 3; tri++)
{
vertices.Add(t.Vertices[t.Elements[(i * 3) + tri]].Position);
}
}
for (int i = 0; i < vertices.Count; i++)
{
tesselated.Add(new Vector2(vertices[i].X, vertices[i].Y));
}
var lineshapes = new List <List <Vector2> >();
foreach (var s in shapes)
{
if (s.Count == 0)
{
continue;
}
List <Vector2> add = new List <Vector2>();
for (int i = 0; i < s.Count; i++)
{
add.Add(new Vector2(s[i].X, s[i].Y));
}
lineshapes.Add(add);
}
if (path.Brush is SolidBrush || path.Pen != null)
{
if (path.Brush is SolidBrush)
{
var sb = path.Brush as SolidBrush;
for (int i = 0; i < tesselated.Count; i++)
{
vbo.AddVertex(new Vertex(tesselated[i], color(sb.Color)));
}
}
if (path.Pen != null)
{
foreach (var list in lineshapes)
{
foreach (var v in TesselateLines(list, path.Pen))
{
vbo.AddVertex(v);
}
}
}
}
}