c = color(255, 204, 0) # Define color 'c' fill(c) # Use color variable 'c' as fill color rect(15, 20, 35, 60) # Draw left rectangle redValue = red(c) # Get red in 'c' print(redValue) # Print "255.0" fill(redValue, 0, 0) # Use 'redValue' in fill rect(50, 20, 35, 60) # Draw right rectangle
Extracts the red value from a color, scaled to match current colorMode(). The value is always returned as a float, so be careful not to assign it to an int value.
The red() function is easy to use and understand, but it is slower than a technique called bit shifting. When working in colorMode(RGB, 255), you can acheive the same results as red() but with greater speed by using the right shift operator (>>) with a bit mask. For example, the following two lines of code are equivalent means of getting the red value of the color value c:
r1 = red(c) # Simpler, but slower to calculate r2 = c >> 16 & 0xFF # Very fast to calculate
>> (right shift)