Java 平滑颜色过渡 [英] Java Smooth Color Transition

问题描述

假设我有两种颜色.

public final static Color FAR = new Color(237, 237, 30);
public final static Color CLOSE = new Color(58, 237, 221);

如何在不浸入深色的情况下从一种颜色过渡到另一种颜色?

How would I transition from one color to the next without dipping into dark colors?

我提出了一些想法，例如

I have come up with ideas such as

    double ratio = diff / range; // goes from 1 to 0
    int red = (int)Math.abs((ratio * FAR.getRed()) - ((1 - ratio) * CLOSE.getRed()));
    int green = (int)Math.abs((ratio * FAR.getGreen()) - ((1 - ratio) * CLOSE.getGreen()));
    int blue = (int)Math.abs((ratio * FAR.getBlue()) - ((1 - ratio) * CLOSE.getBlue()));

或

    double ratio = diff / range; // goes from 1 to 0
    int red = (int) ((1 - (diff / range)) * FAR.getRed() + CLOSE.getRed() - FAR.getRed());
    int green = (int) ((1 - (diff / range)) * FAR.getGreen() + CLOSE.getGreen() - FAR.getGreen());
    int blue = (int) ((1 - (diff / range)) * FAR.getBlue() + CLOSE.getBlue() - FAR.getBlue());

但不幸的是，它们中没有一个能顺利地从一种颜色过渡到另一种颜色.有谁知道如何做到这一点，同时保持颜色明亮而不浸入较深的颜色，或者如何确保渐变过渡平滑而不是先慢后快再慢?

But unfortunately none of them smoothly transition from one color to the next. Would anyone know how to do so while keeping the color bright and not dipping into darker colors, or how to ensure that gradient transition is smooth rather than slow at first then fast and then slow again?

我真的想不出任何公式.

I really ca not come up with any formula.

推荐答案

您在计算中使用了错误的符号.应该是加号，而不是减号，以正确应用比率.

You're using the wrong sign in the calcuations. Should be plus, not minus, to apply the ratio properly.

int red = (int)Math.abs((ratio * FAR.getRed()) + ((1 - ratio) * CLOSE.getRed()));
int green = (int)Math.abs((ratio * FAR.getGreen()) + ((1 - ratio) * CLOSE.getGreen()));
int blue = (int)Math.abs((ratio * FAR.getBlue()) + ((1 - ratio) * CLOSE.getBlue()));

您在现有实现中使用深色的原因是，使用 (-) 时，它们通常会接近零(小于 50?或负但大于 -50?)，在负情况下，好吧，你取的是绝对值，所以它变成了一个小的正数，即深色.

The reason you are getting dark colours with your existing implementation is that with (-), they would often fall close to zero (less than 50? or negative but greater than -50?) and in the negative case, well, you are taking the absolute value so it becomes a small positive number, i.e. a dark colour.

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