void
ChartRenderer::DrawLineGraph(const LeastSquares &lsdata, const Pen &pen)
{
const auto &slots = lsdata.GetSlots();
assert(slots.size() >= 2);
const unsigned n = slots.size();
RasterPoint *points = point_buffer.get(n);
RasterPoint *p = points;
for (const auto &i : slots)
*p++ = ToScreen(i.x, i.y);
assert(p == points + n);
canvas.Select(pen);
canvas.DrawPolyline(points, n);
}
void
ChartRenderer::DrawFilledLineGraph(const LeastSquares &lsdata)
{
const auto &slots = lsdata.GetSlots();
assert(slots.size() >= 2);
const unsigned n = slots.size() + 2;
RasterPoint *points = point_buffer.get(n);
RasterPoint *p = points;
for (const auto &i : slots)
*p++ = ToScreen(i.x, i.y);
const RasterPoint &last = p[-1];
*p++ = RasterPoint{ last.x, rc.bottom - padding_bottom };
*p++ = RasterPoint{ points[0].x, rc.bottom - padding_bottom };
assert(p == points + n);
canvas.DrawPolygon(points, n);
}
void
ChartRenderer::DrawBarChart(const LeastSquares &lsdata)
{
if (x.unscaled || y.unscaled)
return;
canvas.Select(look.bar_brush);
canvas.SelectNullPen();
const auto &slots = lsdata.GetSlots();
for (unsigned i = 0, n = slots.size(); i != n; i++) {
int xmin((i + 1.2) * x.scale
+ (rc.left + padding_left));
int ymin = ScreenY(y.min);
int xmax((i + 1.8) * x.scale
+ (rc.left + padding_left));
int ymax = ScreenY(slots[i].y);
canvas.Rectangle(xmin, ymin, xmax, ymax);
}
}