void
Canvas::DrawAnnulus(PixelScalar x, PixelScalar y,
UPixelScalar small_radius, UPixelScalar big_radius,
Angle start, Angle end)
{
GLDonutVertices vertices(x, y, small_radius, big_radius);
const std::pair<unsigned,unsigned> i = AngleToDonutVertices(start, end);
const unsigned istart = i.first;
const unsigned iend = i.second;
if (!brush.IsHollow()) {
brush.Set();
vertices.bind();
if (istart > iend) {
glDrawArrays(GL_TRIANGLE_STRIP, istart, 64 - istart + 2);
glDrawArrays(GL_TRIANGLE_STRIP, 0, iend + 2);
} else {
glDrawArrays(GL_TRIANGLE_STRIP, istart, iend - istart + 2);
}
}
if (pen_over_brush()) {
pen.Bind();
if (istart != iend && iend != 64) {
if (brush.IsHollow())
vertices.bind();
glDrawArrays(GL_LINE_STRIP, istart, 2);
glDrawArrays(GL_LINE_STRIP, iend, 2);
}
const unsigned pstart = istart / 2;
const unsigned pend = iend / 2;
vertices.bind_inner_circle();
if (pstart < pend) {
glDrawArrays(GL_LINE_STRIP, pstart, pend - pstart + 1);
} else {
glDrawArrays(GL_LINE_STRIP, pstart, 32 - pstart + 1);
glDrawArrays(GL_LINE_STRIP, 0, pend + 1);
}
vertices.bind_outer_circle();
if (pstart < pend) {
glDrawArrays(GL_LINE_STRIP, pstart, pend - pstart + 1);
} else {
glDrawArrays(GL_LINE_STRIP, pstart, 32 - pstart + 1);
glDrawArrays(GL_LINE_STRIP, 0, pend + 1);
}
pen.Unbind();
}
}
void
Canvas::DrawAnnulus(int x, int y,
unsigned small_radius, unsigned big_radius,
Angle start, Angle end)
{
if (1 == 1) {
/* TODO: switched to the unoptimised generic implementation due to
TRAC #2221, caused by rounding error of start/end radial;
should reimplement GLDonutVertices to use the exact start/end
radial */
::Annulus(*this, x, y, big_radius, start, end, small_radius);
return;
}
ScopeVertexPointer vp;
GLDonutVertices vertices(x, y, small_radius, big_radius);
const std::pair<unsigned,unsigned> i = AngleToDonutVertices(start, end);
const unsigned istart = i.first;
const unsigned iend = i.second;
if (!brush.IsHollow()) {
brush.Set();
vertices.Bind(vp);
if (istart > iend) {
glDrawArrays(GL_TRIANGLE_STRIP, istart,
GLDonutVertices::MAX_ANGLE - istart + 2);
glDrawArrays(GL_TRIANGLE_STRIP, 0, iend + 2);
} else {
glDrawArrays(GL_TRIANGLE_STRIP, istart, iend - istart + 2);
}
}
if (IsPenOverBrush()) {
pen.Bind();
if (istart != iend && iend != GLDonutVertices::MAX_ANGLE) {
if (brush.IsHollow())
vertices.Bind(vp);
glDrawArrays(GL_LINE_STRIP, istart, 2);
glDrawArrays(GL_LINE_STRIP, iend, 2);
}
const unsigned pstart = istart / 2;
const unsigned pend = iend / 2;
vertices.BindInnerCircle(vp);
if (pstart < pend) {
glDrawArrays(GL_LINE_STRIP, pstart, pend - pstart + 1);
} else {
glDrawArrays(GL_LINE_STRIP, pstart,
GLDonutVertices::CIRCLE_SIZE - pstart + 1);
glDrawArrays(GL_LINE_STRIP, 0, pend + 1);
}
vertices.BindOuterCircle(vp);
if (pstart < pend) {
glDrawArrays(GL_LINE_STRIP, pstart, pend - pstart + 1);
} else {
glDrawArrays(GL_LINE_STRIP, pstart,
GLDonutVertices::CIRCLE_SIZE - pstart + 1);
glDrawArrays(GL_LINE_STRIP, 0, pend + 1);
}
pen.Unbind();
}
}
