/**
 * Shared per-category band geometry used by categorical-X charts (bar,
 * candlestick, ohlc). The category axis uses unit-wide bands centered
 * on integer indices; within each band, `numSlots` rectangles (bars,
 * candles, …) are laid out side by side with a small inner padding.
 */
export interface SlotGeometry {
    /**
     * Width (in data-space units) of a single slot.
     */
    slotWidth: number;
    /**
     * Half the drawable width of each slot after inner padding.
     */
    halfWidth: number;
}
/**
 * Compute slot geometry for `numSlots` rectangles per category band.
 *
 * `bandInnerFrac` is the fraction of each category's band width
 * actually covered by slots; `barInnerPad` is the relative padding
 * between adjacent slots within a band. Both come from
 * {@link PluginConfig.band_inner_frac} / `bar_inner_pad`. Defaults
 * match the previous hard-coded constants (0.5 / 0.1).
 */
export declare function computeSlotGeometry(numSlots: number, bandInnerFrac?: number, barInnerPad?: number): SlotGeometry;
/**
 * X-center for slot `slotIdx` of `numSlots` in the band centered at
 * `catIdx`. Matches bar's layout: slot 0 on the far left, numSlots-1 on
 * the far right, symmetric about `catIdx`.
 */
export declare function slotCenter(catIdx: number, slotIdx: number, numSlots: number, slotWidth: number): number;