Name

map
Examples 
size(200, 200)
value = 25
m = map(value, 0, 100, 0, width)
ellipse(m, 200, 10, 10)

value = 110
m = map(value, 0, 100, -20, -10)
println(m)  # Prints '-9.0'

settings <- function() {
    size(200, 200)
}

setup <- function() {
    noStroke()
}

draw <- function() {
    background(204)
    x1 = map(mouseX, 0, width, 50, 150)
    ellipse(x1, 75, 50, 50)
    x2 = map(mouseX, 0, width, 0, 200)
    ellipse(x2, 125, 50, 50)
}
Description Re-maps a number from one range to another.

In the first example above, the number 50 is converted from a value in the range of 0 to the width of the window (which is the default value of 100) into a value that ranges from the left edge of the window (0) to half the width of the window (50).

As shown in the second example, numbers outside of the range are not clamped to the minimum and maximum parameters values, because out-of-range values are often intentional and useful.

The third example shows how this function may be applied to user input.
Syntax
map(value, start1, stop1, start2, stop2)
Parameters
valuefloat: the incoming value to be converted
start1float: lower bound of the value's current range
stop1float: upper bound of the value's current range
start2float: lower bound of the value's target range
stop2float: upper bound of the value's target range
Related norm
PVector_lerp
Creative Commons License