protected createMovingSprite()

in libs/game/physics.ts [211:301]
83 lines of code
13 McCabe index (conditional complexity)

    protected createMovingSprite(sprite: Sprite, dtMs: number, dt2: number): MovingSprite {
        const ovx = this.constrain(sprite._vx);
        const ovy = this.constrain(sprite._vy);
        sprite._lastX = sprite._x;
        sprite._lastY = sprite._y;

        if (sprite._ax) {
            sprite._vx = Fx.add(
                sprite._vx,
                Fx.idiv(
                    Fx.imul(
                        sprite._ax,
                        dtMs
                    ),
                    1000
                )
            );
        } else if (sprite._fx) {
            const fx = Fx.idiv(
                Fx.imul(
                    sprite._fx,
                    dtMs
                ),
                1000
            );
            const c = Fx.compare(sprite._vx, fx);
            if (c < 0) // v < f, v += f
                sprite._vx = Fx.min(Fx.zeroFx8, Fx.add(sprite._vx, fx));
            else if (c > 0) // v > f, v -= f
                sprite._vx = Fx.max(Fx.zeroFx8, Fx.sub(sprite._vx, fx));
            else
                sprite._vx = Fx.zeroFx8
        }

        if (sprite._ay) {
            sprite._vy = Fx.add(
                sprite._vy,
                Fx.idiv(
                    Fx.imul(
                        sprite._ay,
                        dtMs
                    ),
                    1000
                )
            );
        } else if (sprite._fy) {
            const fy = Fx.idiv(
                Fx.imul(
                    sprite._fy,
                    dtMs
                ),
                1000
            );
            const c = Fx.compare(sprite._vy, fy);
            if (c < 0) // v < f, v += f
                sprite._vy = Fx.min(Fx.zeroFx8, Fx.add(sprite._vy, fy));
            else if (c > 0) // v > f, v -= f
                sprite._vy = Fx.max(Fx.zeroFx8, Fx.sub(sprite._vy, fy));
            else
                sprite._vy = Fx.zeroFx8;
        }

        sprite._vx = this.constrain(sprite._vx);
        sprite._vy = this.constrain(sprite._vy);

        const dx = Fx8(Fx.toFloat(Fx.add(sprite._vx, ovx)) * dt2 / 1000);
        const dy = Fx8(Fx.toFloat(Fx.add(sprite._vy, ovy)) * dt2 / 1000);

        let xStep = dx;
        let yStep = dy;

        // make step increments smaller until under max step size
        while (Fx.abs(xStep) > this.maxSingleStep || Fx.abs(yStep) > this.maxSingleStep) {
            if (Fx.abs(xStep) > this.minSingleStep) {
                xStep = Fx.idiv(xStep, 2);
            }
            if (Fx.abs(yStep) > this.minSingleStep) {
                yStep = Fx.idiv(yStep, 2);
            }
        }

        return new MovingSprite(
            sprite,
            sprite._vx,
            sprite._vy,
            dx,
            dy,
            xStep,
            yStep
        );
    }