public static void DecomposeContour(Renderer renderer, int firstIndex, int lastIndex, PointF[] points)
{
var pointIndex = firstIndex;
var start = points[pointIndex];
var end = points[lastIndex];
var control = start;
if (start.Type == PointType.Cubic)
{
throw new InvalidFontException("Contours can't start with a cubic control point.");
}
if (start.Type == PointType.Quadratic)
{
// if first point is a control point, try using the last point
if (end.Type == PointType.OnCurve)
{
start = end;
lastIndex--;
}
else
{
// if they're both control points, start at the middle
start.P = (start.P + end.P) / 2;
}
pointIndex--;
}
// let's draw this contour
renderer.MoveTo(start);
var needClose = true;
while (pointIndex < lastIndex)
{
var point = points[++pointIndex];
switch (point.Type)
{
case PointType.OnCurve:
renderer.LineTo(point);
break;
case PointType.Quadratic:
control = point;
var done = false;
while (pointIndex < lastIndex)
{
var next = points[++pointIndex];
if (next.Type == PointType.OnCurve)
{
renderer.QuadraticCurveTo(control, next);
done = true;
break;
}
if (next.Type != PointType.Quadratic)
{
throw new InvalidFontException("Bad outline data.");
}
renderer.QuadraticCurveTo(control, (control.P + next.P) / 2);
control = next;
}
if (!done)
{
// if we hit this point, we're ready to close out the contour
renderer.QuadraticCurveTo(control, start);
needClose = false;
}
break;
case PointType.Cubic:
throw new NotSupportedException();
}
}
if (needClose)
{
renderer.LineTo(start);
}
}
public static void DecomposeContour(Renderer renderer, int firstIndex, int lastIndex, PointF[] points)
{
var pointIndex = firstIndex;
var start = points[pointIndex];
var end = points[lastIndex];
var control = start;
if (start.Type == PointType.Cubic)
throw new InvalidFontException("Contours can't start with a cubic control point.");
if (start.Type == PointType.Quadratic)
{
// if first point is a control point, try using the last point
if (end.Type == PointType.OnCurve)
{
start = end;
lastIndex--;
}
else
{
// if they're both control points, start at the middle
start.P = (start.P + end.P) / 2;
}
pointIndex--;
}
// let's draw this contour
renderer.MoveTo(start);
var needClose = true;
while (pointIndex < lastIndex)
{
var point = points[++pointIndex];
switch (point.Type)
{
case PointType.OnCurve:
renderer.LineTo(point);
break;
case PointType.Quadratic:
control = point;
var done = false;
while (pointIndex < lastIndex)
{
var next = points[++pointIndex];
if (next.Type == PointType.OnCurve)
{
renderer.QuadraticCurveTo(control, next);
done = true;
break;
}
if (next.Type != PointType.Quadratic)
throw new InvalidFontException("Bad outline data.");
renderer.QuadraticCurveTo(control, (control.P + next.P) / 2);
control = next;
}
if (!done)
{
// if we hit this point, we're ready to close out the contour
renderer.QuadraticCurveTo(control, start);
needClose = false;
}
break;
case PointType.Cubic:
throw new NotSupportedException();
}
}
if (needClose)
renderer.LineTo(start);
}
