Created
September 30, 2015 08:29
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Utility methods for creating fade animations between two colours
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import android.graphics.Color; | |
public final class PaintUtils { | |
private PaintUtils() { throw new AssertionError(); } | |
public static int createInterimColor(int colorFrom, int colorTo, float percentage) { | |
int[] colorFromArray, colorToArray; | |
colorFromArray = new int[] { | |
Color.red(colorFrom), | |
Color.green(colorFrom), | |
Color.blue(colorFrom) | |
}; | |
colorToArray = new int[] { | |
Color.red(colorTo), | |
Color.green(colorTo), | |
Color.blue(colorTo) | |
}; | |
return createInterimColor(colorFromArray, colorToArray, percentage); | |
} | |
public static int createInterimColor(int[] colorFromInRgb, int[] colorToInRgb, float percentage) { | |
int r, g, b; | |
int minValue; | |
float adjustedPercentage; | |
minValue = Math.min(colorFromInRgb[0], colorToInRgb[0]); | |
adjustedPercentage = (colorFromInRgb[0] >= colorToInRgb[0]) ? (1F - percentage) : percentage; | |
r = (int) (minValue + ((Math.abs(colorFromInRgb[0] - colorToInRgb[0])) * adjustedPercentage)); | |
minValue = Math.min(colorFromInRgb[1], colorToInRgb[1]); | |
adjustedPercentage = (colorFromInRgb[1] >= colorToInRgb[1]) ? (1F - percentage) : percentage; | |
g = (int) (minValue + ((Math.abs(colorFromInRgb[1] - colorToInRgb[1])) * adjustedPercentage)); | |
minValue = Math.min(colorFromInRgb[2], colorToInRgb[2]); | |
adjustedPercentage = (colorFromInRgb[2] >= colorToInRgb[2]) ? (1F - percentage) : percentage; | |
b = (int) (minValue + ((Math.abs(colorFromInRgb[2] - colorToInRgb[2])) * adjustedPercentage)); | |
return Color.rgb(r, g, b); | |
} |
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