/**
 * Context that a WaveformAnnotation can use to draw into the waveform display.
 */
export interface AnnotationContext {
    /**
     * Width of the canvas in pixels.
     */
    width: number;
    /**
     * Height of the canvas in pixels.
     */
    height: number;
    /**
     * Convert a frame number to a pixel X coordinate.
     */
    frameToX(frame: number): number;
    /**
     * Convert an audio value to a pixel Y coordinate.
     */
    valueToY(value: number): number;
    /**
     * Graphics context to draw into.
     */
    context: CanvasRenderingContext2D;
    /**
     * Color for foreground elements, such as text.
     */
    foregroundColor: string;
    /**
     * Color for secondary elements, like arrows and braces.
     */
    secondaryForegroundColor: string;
    /**
     * Color to use for highlighting something brightly.
     */
    highlightColor: string;
}
/**
 * Interface of annotations of the raw waveform.
 */
export interface WaveformAnnotation {
    /**
     * Draw the annotation.
     */
    draw(ctx: AnnotationContext): void;
}
/**
 * Annotation to draw a point.
 */
export declare class PointAnnotation implements WaveformAnnotation {
    readonly frame: number;
    readonly value: number;
    readonly solid: boolean;
    constructor(frame: number, value: number, solid: boolean);
    draw(ctx: AnnotationContext): void;
}
/**
 * Annotation to draw a horizontal line.
 */
export declare class HorizontalLineAnnotation implements WaveformAnnotation {
    readonly value: number;
    readonly x1: number;
    readonly x2: number;
    constructor(value: number, x1: number, x2: number);
    draw(ctx: AnnotationContext): void;
}
/**
 * Annotation to draw a vertical line.
 */
export declare class VerticalLineAnnotation implements WaveformAnnotation {
    readonly frame: number;
    constructor(frame: number);
    draw(ctx: AnnotationContext): void;
}
/**
 * Label with braces.
 */
export declare class LabelAnnotation implements WaveformAnnotation {
    readonly label: string;
    readonly left: number;
    readonly right: number;
    readonly onTop: boolean;
    constructor(label: string, left: number, right: number, onTop: boolean);
    draw(ctx: AnnotationContext): void;
}
/**
 * Draw a brace with specified label.
 */
export declare function drawBraceAndLabel(ctx: CanvasRenderingContext2D, height: number, left: number, right: number, braceColor: string, label: string, labelColor: string, drawOnTop: boolean): void;
/**
 * Draw a horizontal brace.
 */
export declare function drawBrace(ctx: CanvasRenderingContext2D, left: number, middle: number, right: number, top: number, bottom: number, drawOnTop: boolean): void;
//# sourceMappingURL=Annotations.d.ts.map