/
flan.js
195 lines (168 loc) · 4.51 KB
/
flan.js
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//
// Curried functions
// makeCounter : [Number] [Number] -> Any -> Number
function makeCounter(start, step) {
start = start || 0;
step = step || 1;
var count = start;
return function(e) {
var now = count;
count += step;
return now;
};
}
// makeDownCounter : [Number] [Number] -> Any -> Number
function makeDownCounter(start, step) {
start = start || 0;
step = step || 1;
return makeCounter(start, -step);
}
// makeAdder : Number -> Number -> Number
function makeAdder(start) {
return function(step) {
return start + step;
};
}
// makeMultiplier : Number -> Number -> Number
function makeMultiplier(start) {
return function(step) {
return start * step;
};
}
//
// Parsing colours
// parseColour : String -> U({r: Number, g: Number, b: Number}, undefined)
//
// Parse CSS colours in the #rrggbb format into an object with r, g, b components
// Formats we don't handle: #rgb, rgb(N, N, N), keywords like white, black, aqua.
function parseColour(colour) {
var m = colour.match(/\#([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])([0-9a-fA-F][0-9a-fA-F])/);
if(m) {
return {
r: parseInt(m[1], 16),
g: parseInt(m[2], 16),
b: parseInt(m[3], 16)
};
}
}//
// Events
// finiteTimerE : Number Number -> EventStream Number
function finiteTimerE(interval, ticks) {
var timer = timerE(interval);
var count = 0;
var stop = receiverE();
var counter = function(time) {
if (count == ticks) {
disableTimer(timer);
stop.sendEvent(true);
} else {
count++;
}
return time;
};
var finiteTimer = timer.mapE(counter);
finiteTimer.stopE = stop;
return finiteTimer;
}
// countE : EventStream Any [Number] [Number] -> EventStream Number
function countE(baseE, start, step) {
var counter = makeCounter(start, step);
var evt = baseE.mapE(counter);
return evt;
}
// rangeE : Number Number Number Number -> EventStream Number
// start > stop or start < stop
function rangeE(start, stop, steps, interval) {
var step = (stop - start) / steps;
var timer_e = finiteTimerE(interval, steps);
var range_e;
range_e = countE(timer_e, start, step);
range_e.stopE = timer_e.stopE;
return range_e;
}
//
// Flapjax Effects
//
//
// Core functions
//
// slideDownE : Element -> EventStream Boolean
//
// Scrolls height of an element from 0 to 100%. Returned event fires when the animation ends.
function slideDownE(elt) {
var height = elt.getHeight();
var steps = 20;
var interval = 20;
var height_e = rangeE(0, height, steps, interval);
insertValueB({style: {height: height_e.startsWith(0)}}, elt);
return height_e.stopE;
}
// slideUpE : Element -> EventStream Boolean
//
// Scrolls height of an element from 100% to 0. Returned event fires when the animation ends.
function slideUpE(elt) {
var height = elt.getHeight();
var steps = 20;
var interval = 20;
var height_e = rangeE(height, 0, steps, interval);
insertValueB({style: {height: height_e.startsWith(height)}}, elt);
return height_e.stopE;
}
// fadeInE : Element -> EventStream Boolean
function fadeInE(elt) {
var steps = 20;
var interval = 20;
var opacity_e = rangeE(0, 1, steps, interval);
insertValueB({style: {opacity: opacity_e.startsWith(0)}}, elt);
return opacity_e.stopE;
}
// fadeOutE : Element -> EventStream Boolean
function fadeOutE(elt) {
var steps = 20;
var interval = 20;
var opacity_e = rangeE(1, 0, steps, interval);
insertValueB({style: {opacity: opacity_e.startsWith(1)}}, elt);
return opacity_e.stopE;
}
function straightToE(elt, start, end, duration) {
var steps = 100;
var interval = 20;
var x_e = rangeE(start.x, end.x, steps, interval);
var x_b = x_e.startsWith(start.x);
var y_e = rangeE(start.y, end.y, steps, interval);
var y_b = y_e.startsWith(start.y);
insertValueB({style: { position:"absolute", left: x_b, top: y_b }}, elt);
return y_e.stopE;
}
/*
function straightToB(elt, start, end, duration) {
var steps = 100;
var interval = 20;
var x_b = rangeB(start.x, end.x, steps, interval);
var y_b = rangeB(start.y, end.y, steps, interval);
insertValueB({style: { position:"absolute", left: x_b, top: y_b }}, elt);
return;
}
*/
/*
* show
* hide
* fadeTo(speed, opacity )
* slideLeft(duration, steps)
* slideRight(duration, steps)
* straightTo(x, y, duration, steps, easing)
* curveTo(x, y, duration, steps, easing)
* shake$
*
elt.animate(
params={
width: "70%",
opacity: 0.4,
marginLeft: "0.6in",
fontSize: "3em",
borderWidth: "10px"
},
duration = 1500,
steps );
});
*/