Java平滑色彩转换
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?
我想出了诸如此类的想法
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()));
要么
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,它们都没有顺利地从一种颜色过渡到另一种颜色。 有人知道怎么做,同时保持颜色明亮而不是浸入更深的颜色,或者如何确保渐变过渡是平滑的而不是先减慢然后快速然后再慢?
我真的没有想出任何配方。
你在计算中使用了错误的符号。 应该加上而不是减去正确应用比率。
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()));
您使用现有实施的颜色变暗的原因是,( – ),它们通常会接近零(小于50?或负数但大于-50?)而在负面情况下,您正在服用绝对值所以它变成一个小的正数,即一个暗色。
这适合我:
// Steps between fading from one colour to another. private static final int FadeSteps = 25; private void fade(Label panel, Color colour) throws InterruptedException { final Color oldColour = panel.getBackground(); final int dRed = colour.getRed() - oldColour.getRed(); final int dGreen = colour.getGreen() - oldColour.getGreen(); final int dBlue = colour.getBlue() - oldColour.getBlue(); // No point if no difference. if (dRed != 0 || dGreen != 0 || dBlue != 0) { // Do it in n steps. for (int i = 0; i <= FadeSteps; i++) { final Color c = new Color( oldColour.getRed() + ((dRed * i) / FadeSteps), oldColour.getGreen() + ((dGreen * i) / FadeSteps), oldColour.getBlue() + ((dBlue * i) / FadeSteps)); panel.setBackground(c); Thread.sleep(10); } } }
不是最新的代码,但它的工作原理。
(ratio * FAR.getGreen()) + ((1 - ratio) * CLOSE.getGreen())
如果比率从0到1,那么这是加权平均值,比如说= 1/2,那么它将是aritmetical average,如果ratio = 1/3,那么它是加权平均值,其中FAR的权重为1而CLOSE具有权重2