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make fade non-linear

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This commit is contained in:
Brad Hefta-Gaub 2016-02-27 17:13:09 -08:00
parent 6d9c585604
commit e403c990d9
1 changed files with 8 additions and 18 deletions
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26
examples/depthReticle.js
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@ -14,10 +14,9 @@ var APPARENT_2D_OVERLAY_DEPTH = 1.0;
var APPARENT_MAXIMUM_DEPTH = 100.0; // this is a depth at which things all seem sufficiently distant
var lastDepthCheckTime = Date.now();
var desiredDepth = APPARENT_2D_OVERLAY_DEPTH;
var wasDepth = Reticle.depth; // depth at the time we changed our desired depth
var desiredDepthLastSet = lastDepthCheckTime; // time we changed our desired depth
var TIME_BETWEEN_DEPTH_CHECKS = 100;
var TIME_TO_FADE_DEPTH = 50;
var MINIMUM_DEPTH_ADJUST = 0.01;
var NON_LINEAR_DIVISOR = 2;
Script.update.connect(function(deltaTime) {
var now = Date.now();
@ -53,30 +52,21 @@ Script.update.connect(function(deltaTime) {
// If the desired depth has changed, reset our fade start time
if (desiredDepth != newDesiredDepth) {
desiredDepthLastSet = now;
desiredDepth = newDesiredDepth;
wasDepth = Reticle.depth;
}
}
// move the reticle toward the desired depth
if (desiredDepth != Reticle.depth) {
// determine the time between now, and when we set our determined our desiredDepth
var elapsed = now - desiredDepthLastSet;
var distanceToFade = desiredDepth - wasDepth;
var percentElapsed = Math.min(1, elapsed / TIME_TO_FADE_DEPTH);
// special case to handle no fade settings
if (TIME_TO_FADE_DEPTH == 0) {
percentElapsed = 1;
}
var depthDelta = distanceToFade * percentElapsed;
var newDepth = wasDepth + depthDelta;
if (percentElapsed == 1) {
// cut distance between desiredDepth and current depth in half until we're close enough
var distanceToAdjustThisCycle = (desiredDepth - Reticle.depth) / NON_LINEAR_DIVISOR;
if (Math.abs(distanceToAdjustThisCycle) < MINIMUM_DEPTH_ADJUST) {
newDepth = desiredDepth;
} else {
newDepth = Reticle.depth + distanceToAdjustThisCycle;
}
Reticle.setDepth(newDepth);
}
});