yAtPrice method
Converts financial price to screen Y coordinate inside main pane.
Implementation
double yAtPrice(double price) {
final chartWidth = (_viewport.viewportWidth - _priceAxisWidth).clamp(
10.0,
double.infinity,
);
final bounds = Rect.fromLTWH(0, 0, chartWidth, mainPaneHeight);
return CoordinateConverter.priceToY(price, bounds, currentPriceRange);
}