Added signature_pad.d.ts definitions

signature_pad/signature_pad.d.ts

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+// Type definitions for signature_pad
+// Project: https://github.com/szimek/signature_pad
+// Definitions by: Abubaker Bashir <https://github.com/AbubakerB>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+// Project by: Szymon Nowak <https://github.com/szimek>
+
+declare class Point {
+    x: number;
+    y: number;
+    time: number;
+    constructor(x: number, y: number, time: number);
+    velocityFrom(start: Point): number;
+    distanceTo(start: Point): number;
+}
+
+declare class CurveControl {
+    c1: Point;
+    c2: Point;
+    constructor(c1: Point, c2: Point);
+}
+
+declare class Bezier {
+    startPoint: Point;
+    control1: CurveControl;
+    control2: CurveControl;
+    endPoint: Point;
+    constructor(startPoint, control1, control2, endPoint);
+    length(): number;
+    _point(t: number, start: number, c1: number, c2: number, end: number): number;
+}
+
+declare class SignaturePadOptions {
+    /**
+    *   (float) Weight used to modify new velocity based on the previous velocity. Defaults to 0.7.
+    */
+    velocityFilterWeight: number;
+    /**
+    *   (float) Minimum width of a line. Defaults to 0.5.
+    */
+    minWidth: number;
+    /**
+    *   (float) Maximum width of a line. Defaults to 2.5.
+    */
+    maxWidth: number;
+    /**
+    *   (float or function) Radius of a single dot.
+    */
+    dotSize: Function;
+    /**
+    *   (string) Color used to draw the lines. Can be any color format accepted by context.fillStyle.
+    *   Defaults to "black".
+    */
+    penColor: string;
+    /**
+    *   (string) Color used to clear the background. Can be any color format accepted by context.fillStyle.
+    *   Defaults to "rgba(0,0,0,0)" (transparent black). Use a non-transparent color e.g. "rgb(255,255,255)"
+    *   (opaque white) if you'd like to save signatures as JPEG images.
+    */
+    backgroundColor: string;
+    /**
+    *   (function) Callback when stroke begin.
+    */
+    onEnd: Function;
+    /**
+    *   (function) Callback when stroke end.
+    */
+    onBegin: Function;
+}
+
+declare class SignaturePad {
+    points: Array<Point>;
+    _lastVelocity: number;
+    _lastWidth: number;
+    _isEmpty: boolean;
+    _mouseButtonDown: boolean;
+    _ctx: CanvasRenderingContext2D;
+    _canvas: HTMLCanvasElement;
+    velocityFilterWeight: number;
+    minWidth: number;
+    maxWidth: number;
+    dotSize: Function;
+    penColor: string;
+    backgroundColor: string;
+    onEnd: Function;
+    onBegin: Function;
+
+    constructor(canvas: Element, options?: SignaturePadOptions);
+    /**
+    *   Clears the canvas
+    */
+    clear(): void;
+    /**
+    *   Returns true if canvas is empty, otherwise returns false
+    */
+    isEmpty(): boolean;
+    /**
+    *   Draws signature image from data URL
+    */
+    fromDataURL(dataUrl: string);
+    /**
+    *   Returns signature image as data URL
+    */
+    toDataURL(): string;
+
+    _strokeBegin(event: Event): void;
+    _strokeUpdate(event: Event): void;
+    _strokeDraw(point: Point): void;
+    _strokeEnd(event: Event): void;
+    _handleMouseEvents(): void;
+    _handleTouchEvents(): void;
+    _reset(): void;
+    _createPoint(event: Event): Point;
+    _addPoint(point: Point): void;
+    _calculateCurveControlPoints(point1: Point, point2: Point, point3: Point): void;
+
+    _addCurve(curve: Bezier): void;
+    _drawPoint(x: number, y: number, size: number): void;
+    _drawCurve(curve: Bezier, startWidth: number, endWidth: number): void;
+    _strokeWidth(velocity: number): void;
+}