mirror of
https://github.com/processing/processing4.git
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87 lines
1.6 KiB
XML
87 lines
1.6 KiB
XML
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<root>
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<name>lerp()</name>
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<category>Math</category>
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<subcategory>Calculation</subcategory>
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<usage>Web & Application</usage>
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<example>
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<image>lerp_.gif</image>
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<code>
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float a = 20;
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float b = 80;
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float c = lerp(a, b, .2);
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float d = lerp(a, b, .5);
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float e = lerp(a, b, .8);
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beginShape(POINTS);
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vertex(a, 50);
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vertex(b, 50);
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vertex(c, 50);
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vertex(d, 50);
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vertex(e, 50);
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endShape();
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</code>
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</example>
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<example>
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<image>lerp_2.gif</image>
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<code>
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int x1 = 15;
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int y1 = 10;
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int x2 = 80;
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int y2 = 90;
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line(x1, y1, x2, y2);
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for(int i=0; i<=10; i++) {
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float x = lerp(x1, x2, i/10.0) + 10;
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float y = lerp(y1, y2, i/10.0);
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point(x, y);
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}
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</code>
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</example>
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<description>
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Calculates a number between two numbers at a specific increment. The <b>amt</b> parameter is the amount to interpolate between the two values where 0.0 equal to the first point, 0.1 is very near the first point, 0.5 is half-way in between, etc. The lerp function is convenient for creating motion along a strait path and for drawing dotted lines.
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</description>
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<syntax>
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lerp(<c>value1</c>, <c>value2</c>, <c>amt</c>)
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</syntax>
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<parameter>
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<label>value1</label>
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<description>float or int: first value</description>
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</parameter>
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<parameter>
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<label>value2</label>
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<description>float or int: second value</description>
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</parameter>
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<parameter>
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<label>amt</label>
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<description>float: between 0.0 and 1.0</description>
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</parameter>
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<returns>float</returns>
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<related>
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curvePoint()
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bezierPoint()
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</related>
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<availability>1.0</availability>
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<type>Function</type>
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<partof>Core</partof>
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<level>Extended</level>
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</root>
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