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| Name | red() |
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|---|---|---|---|
| Examples |  color 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 float redValue = red(c); // Get red in 'c' println(redValue); // Print "255.0" fill(redValue, 0, 0); // Use 'redValue' in new fill rect(50, 20, 35, 60); // Draw right rectangle | ||
| Description |
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: float r1 = red(c); // Simpler, but slower to calculate float r2 = c >> 16 & 0xFF; // Very fast to calculate |
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| Syntax | red(rgb) | ||
| Parameters |
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| Returns | float | ||
| Related | green() blue() alpha() hue() saturation() brightness() >> (right shift) |
