private void Step(GLEx g, Progress e, int index, int frame,
LColor color, float alpha) {
switch (stepType) {
case 0:
g.FillOval(X() + e.x - blockHalfWidth, Y() + e.y - blockHalfHeight,
blockWidth, blockHeight);
break;
case 1:
g.FillRect(X() + e.x - blockHalfWidth, Y() + e.y - blockHalfHeight,
blockWidth, blockHeight);
break;
case 2:
if (last != null) {
float[] xs = { X() + last.x, X() + e.x };
float[] ys = { Y() + last.y, Y() + e.y };
g.DrawPolygon(xs, ys, 2);
}
last = e;
break;
case 3:
if (last != null) {
g.DrawLine(X() + last.x, Y() + last.y, X() + e.x, Y() + e.y);
}
last = e;
break;
case 4:
Step(g, e.x, e.y, e.progress, index, frame, color, alpha);
break;
}
}