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example pic
float base = height * 0.75;
float scalar = 0.8; // Different for each font

textSize(32);  // Set initial text size
float a = textDescent() * scalar;  // Calc ascent
line(0, base+a, width, base+a);
text("dp", 0, base);  // Draw text on baseline

textSize(64);  // Increase text size
a = textDescent() * scalar;  // Recalc ascent
line(40, base+a, width, base+a);
text("dp", 40, base);  // Draw text on baseline
Description Returns descent of the current font at its current size. This information is useful for determining the height of the font below the baseline. For example, adding the textAscent() and textDescent() values will give you the total height of the line.
Updated on October 2, 2018 05:02:09pm EDT

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