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import { TiltShiftAxisFilter } from './TiltShiftAxisFilter';

// @author Vico @vicocotea
// original filter https://github.com/evanw/glfx.js/blob/master/src/filters/blur/tiltshift.js
// by Evan Wallace : http://madebyevan.com/

/**
 * A TiltShiftYFilter.
 *
 * @class
 * @extends PIXI.TiltShiftAxisFilter
 * @memberof PIXI.filters
 * @private
 */
class TiltShiftYFilter extends TiltShiftAxisFilter
{
    /**
     * Updates the filter delta values.
     */
    protected updateDelta(): void
    {
        const dx = this.uniforms.end.x - this.uniforms.start.x;
        const dy = this.uniforms.end.y - this.uniforms.start.y;
        const d = Math.sqrt((dx * dx) + (dy * dy));

        this.uniforms.delta.x = -dy / d;
        this.uniforms.delta.y = dx / d;
    }
}

export { TiltShiftYFilter };