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Clarified interval formula #38

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Clarified interval formula #38

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12 changes: 10 additions & 2 deletions examples/drawing_animate.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,16 @@ function smiley(x, y) {
function drawing() {
// The angle variable stores the current rotation
var angle = 0;
// Draw twenty frames per second (20 * 50 = 1000 milliseconds)
setInterval(frame, 50);

// We want to draw twenty frames per second
var framesPerSecond = 20;

// 1 second equals 1000 milliseconds.
var frameInterval = 1000 / framesPerSecond;

// setInterval expects the interval in milliseconds
setInterval(frame, frameInterval);

function frame() {
// Clear the screen
clear();
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