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|描述|| Extracts the blue value from a color, scaled to match current colorMode(). The value is always returned as afloat, so be careful not to assign it to an
The blue() function is easy to use and understand, but it is slower than a technique called bit masking. When working in colorMode(RGB, 255), you can acheive the same results as blue() but with greater speed by using a bit mask to remove the other color components. For example, the following two lines of code are equivalent means of getting the blue value of the color value c:
float b1 = blue(c); // Simpler, but slower to calculatefloat b2 = c & 0xFF; // Very fast to calculate
>> (right shift)
Updated on October 2, 2018 05:02:10pm EDT