touchgfx的缓动方程

在touchgfx中设计者为我们设计了缓动方程帮助我们适配不同场景下的移动。
描述缓动方程的网站https://easings.net/

鼠标放上去即可右边就会出来一个示例 即右边那个黑点点，它的移动代表了不同的缓动方程的移动形式。

自定义缓动方程

    /**
     * Cubic easing in: t^3. Accelerating from zero velocity.
     *
     * @param  t Time. The current time or step.
     * @param  b Beginning. The beginning value.
     * @param  c Change. The change between the beginning value and the destination value.
     * @param  d Duration. The total time or total number of steps.
     *
     * @return The current value as a function of the current time or step.
     */
    static int16_t cubicEaseIn(uint16_t t, int16_t b, int16_t c, uint16_t d);


int16_t EasingEquations::cubicEaseIn(uint16_t t, int16_t b, int16_t c, uint16_t d)
{
    int16_t result = b + c;
    if ((t < d) && (d != 0))
    {
        float tmp = static_cast(t) / d;
        result = roundRespectSign(c * tmp * tmp * tmp + b);
    }
    return result;
}


virtual void handleTickEvent()
{
    ....
    counter++;
    // Calculate value in [0;targetValue]
    calculatedValue = MyEasingEquations::myCustomEeasingEq(counter, 0, targetValue, animationSteps);
....