Question

我想获得介于0.0和-0.5之间的结果。我有值：MIN = x，MAX = y和IN = x。值MIN应该导致-0.5％和MAX 0.0％的百分比。例如，如果MIN的值为240px，则MAX为600px，IN为360px，IN应为-0.33％的百分比。但我不知道如何进行这种计算。

P.S。：IN不能高于0.0或低于-0.5。 P.2.2：对不起我的英语。

我试过的代码，但没有用：

float percent = (((currentX / max) * min) / (max - min) * (-1)); Animation openNavigationDrawer = new TranslateAnimation( Animation.RELATIVE_TO_PARENT, percent, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f); openNavigationDrawer.setDuration(200); navigationDrawer.setAnimation(openNavigationDrawer);

第二个（工作，但不好）：

float percent = -0.0f;
    float posDividerDefault = max / 12, 
    posDividerOne = min + posDividerDefault, posDividerTwo = posDividerOne + posDividerDefault, 
    posDividerThree = posDividerTwo + posDividerDefault, posDividerFour = posDividerThree + posDividerDefault, 
    posDividerFive = posDividerFour + posDividerDefault, posDividerSix = posDividerFive + posDividerDefault;

    if (currentX < posDividerOne) {
        percent = -0.5f;

    } else if (currentX > posDividerOne && currentX < posDividerTwo) {
        percent = -0.45f;

    } else if (currentX > posDividerTwo && currentX < posDividerThree) {
        percent = -0.4f;

    } else if (currentX > posDividerThree && currentX < posDividerFour) {
        percent = -0.3f;

    } else if (currentX > posDividerFour && currentX < posDividerFive) {
        percent = -0.2f;

    } else if (currentX > posDividerFive && currentX < posDividerSix) {
        percent = -0.1f;

    } else if (currentX > posDividerSix) {
        percent = -0.0f;

    }

Answer 1

根据你的描述，我想你想要的公式是：

result = -0.5 + 0.5*( (in - min) / (max - min) );

但是既然你没有展示任何代码也没有解释它的目的，那只是一个疯狂的猜测。

Answer 2

与@MightyPork完全相同，但恕我直言会更清楚地说明发生了什么：

static final double MIN = -0.5;
static final double MAX = 0.0;
public void test(double x, double min, double max) {
  // (x - min)     = translate to min
  // / (max - min) = scale to unit
  // * (MAX - MIN) = scale to final
  // + MIN         = translate to MIN
  double v = (x - min) / (max - min) * (MAX - MIN) + MIN;
  System.out.println("test("+x+","+min+","+max+") = "+v);
}

两个值之间的百分比计算

2 个答案: