konva/src/shapes/Rect.js

///////////////////////////////////////////////////////////////////////
//  Rect
///////////////////////////////////////////////////////////////////////
Kinetic.Rect = Kinetic.Shape.extend({
    /**
     * Rect constructor
     * @constructor
     * @augments Kinetic.Shape
     * @param {Object} config
     */
    init: function(config) {
        this.setDefaultAttrs({
            width: 0,
            height: 0,
            cornerRadius: 0
        });

        this.shapeType = "Rect";

        config.drawFunc = function() {
            var context = this.getContext();
            context.beginPath();
            if(this.attrs.cornerRadius === 0) {
                // simple rect - don't bother doing all that complicated maths stuff.
                context.rect(0, 0, this.attrs.width, this.attrs.height);
            }
            else {
                // arcTo would be nicer, but browser support is patchy (Opera)
                context.moveTo(this.attrs.cornerRadius, 0);
                context.lineTo(this.attrs.width - this.attrs.cornerRadius, 0);
                context.arc(this.attrs.width - this.attrs.cornerRadius, this.attrs.cornerRadius, this.attrs.cornerRadius, Math.PI * 3 / 2, 0, false);
                context.lineTo(this.attrs.width, this.attrs.height - this.attrs.cornerRadius);
                context.arc(this.attrs.width - this.attrs.cornerRadius, this.attrs.height - this.attrs.cornerRadius, this.attrs.cornerRadius, 0, Math.PI / 2, false);
                context.lineTo(this.attrs.cornerRadius, this.attrs.height);
                context.arc(this.attrs.cornerRadius, this.attrs.height - this.attrs.cornerRadius, this.attrs.cornerRadius, Math.PI / 2, Math.PI, false);
                context.lineTo(0, this.attrs.cornerRadius);
                context.arc(this.attrs.cornerRadius, this.attrs.cornerRadius, this.attrs.cornerRadius, Math.PI, Math.PI * 3 / 2, false);
            }
            context.closePath();

            this.fill();
            this.stroke();
        };
        // call super constructor
        this._super(config);
    },
    /**
     * set width and height
     */
    setSize: function() {
        var size = Kinetic.GlobalObject._getSize(Array.prototype.slice.call(arguments));
        this.setAttrs(size);
    },
    /**
     * return rect size
     */
    getSize: function() {
        return {
            width: this.attrs.width,
            height: this.attrs.height
        };
    }
});

// add getters setters
Kinetic.Node.addGettersSetters(Kinetic.Rect, ['width', 'height', 'cornerRadius']);

/**
 * set width
 * @name setWidth
 * @methodOf Kinetic.Rect.prototype
 * @param {Number} width
 */

/**
 * set height
 * @name setHeight
 * @methodOf Kinetic.Rect.prototype
 * @param {Number} height
 */

/**
 * set corner radius
 * @name setCornerRadius
 * @methodOf Kinetic.Rect.prototype
 * @param {Number} radius
 */

/**
 * get width
 * @name getWidth
 * @methodOf Kinetic.Rect.prototype
 */

/**
 * get height
 * @name getHeight
 * @methodOf Kinetic.Rect.prototype
 */

/**
 * get corner radius
 * @name getCornerRadius
 * @methodOf Kinetic.Rect.prototype
 */