var orientations = { PORTRAIT: 0, LANDSCAPE_LEFT: 90, LANDSCAPE_RIGHT: -90, }; function DeriveReliableWindowDimensions() { // https://www.howtocreate.co.uk/tutorials/javascript/browserwindow var Result = { X: null, Y: null, }; var DisplaySettings = []; for(var i = 0; i < document.body.children.length; ++i) { var Child = document.body.children[i]; DisplaySettings.push(Child.style.display); Child.style.display = "none"; } var Element = document.createElement("div"); Element.style.position = "fixed"; Element.style.top = 0; Element.style.right = 0; Element.style.bottom = 0; Element.style.left = 0; Element.style.zOffset = -1; Element.style.opacity = 0; var ElementInPlace = document.body.appendChild(Element); Result.X = ElementInPlace.offsetWidth; Result.Y = ElementInPlace.offsetHeight; ElementInPlace.remove(); for(var i = 0; i < document.body.children.length; ++i) { var Child = document.body.children[i]; Child.style.display = DisplaySettings.shift(); } return Result; } function GetWindowDim(IsMobile) { var Result = { X: null, Y: null, }; if(IsMobile) { Result = DeriveReliableWindowDimensions(); } else { Result.X = document.documentElement.clientWidth; Result.Y = document.documentElement.clientHeight; } return Result; } function IsVisible(Element, WindowDim) { var BoundingRect = Element.getBoundingClientRect(); return ((BoundingRect.top >= 0 && BoundingRect.top <= WindowDim.Y) || (BoundingRect.bottom >= 0 && BoundingRect.bottom <= WindowDim.Y) || (BoundingRect.top < 0 && BoundingRect.bottom > WindowDim.Y)) && ((BoundingRect.left >= 0 && BoundingRect.left <= WindowDim.X) || (BoundingRect.right >= 0 && BoundingRect.right <= WindowDim.X) || (BoundingRect.left < 0 && BoundingRect.right > WindowDim.X)); } function GetRealOrientation(PreferredLandscape, IsMobile) { var Result = window.orientation; var WindowDim = GetWindowDim(IsMobile); if(WindowDim.Y > WindowDim.X) { Result = orientations.PORTRAIT; } else if(Result == undefined || Result == orientations.PORTRAIT) { Result = PreferredLandscape; } return Result; } var DebugConsoleMessageCount = 0; function Say(Message) { var DebugConsole = document.getElementById("debug-console"); if(DebugConsole) { DebugConsole.textContent += DebugConsoleMessageCount++ + ": " + Message + "\n"; DebugConsole.scrollTo( { top: DebugConsole.scrollHeight, behavior: "smooth" }); } } function getBackgroundBrightness(element) { var colour = getComputedStyle(element).getPropertyValue("background-color"); var depth = 0; while((colour == "transparent" || colour == "rgba(0, 0, 0, 0)") && depth <= 4) { element = element.parentNode; colour = getComputedStyle(element).getPropertyValue("background-color"); ++depth; } var rgb = colour.slice(4, -1).split(", "); var result = Math.sqrt(rgb[0] * rgb[0] * .241 + rgb[1] * rgb[1] * .691 + rgb[2] * rgb[2] * .068); return result; } function setSpriteLightness(spriteElement) { if(getBackgroundBrightness(spriteElement) < 127) { spriteElement.classList.add("dark"); } else { spriteElement.classList.remove("dark"); } } function elementIsFocused(Element) { var Result = false; if(Element.classList.contains("focused")) { Result = true; } while(Element.parent) { Element = Element.parent; if(Element.classList.contains("focused")) { Result = true; break; } } return Result; } function focusSprite(Element) { if(Element.classList.contains("cineraSprite")) { setSpriteLightness(Element); Element.style.backgroundPositionY = Element.getAttribute("data-y-focused") + "px"; } for(var i = 0; i < Element.childElementCount; ++i) { focusSprite(Element.children[i]); } } function enableSprite(Element) { if(Element.classList.contains("focused")) { focusSprite(Element); } else { if(Element.classList.contains("cineraSprite")) { setSpriteLightness(Element); Element.style.backgroundPositionY = Element.getAttribute("data-y-normal") + "px"; } for(var i = 0; i < Element.childElementCount; ++i) { enableSprite(Element.children[i]); } } } function disableSprite(Element) { if(Element.classList.contains("cineraSprite")) { setSpriteLightness(Element); Element.style.backgroundPositionY = Element.getAttribute("data-y-disabled") + "px"; } for(var i = 0; i < Element.childElementCount; ++i) { disableSprite(Element.children[i]); } } function unfocusSprite(Element) { if(Element.classList.contains("off")) { disableSprite(Element); } else { if(Element.classList.contains("cineraSprite")) { setSpriteLightness(Element); Element.style.backgroundPositionY = Element.getAttribute("data-y-normal") + "px"; } for(var i = 0; i < Element.childElementCount; ++i) { unfocusSprite(Element.children[i]); } } } function IsMobile() { // NOTE(matt): From https://medium.com/simplejs/detect-the-users-device-type-with-a-simple-javascript-check-4fc656b735e1 var Identifier = navigator.userAgent||navigator.vendor||window.opera; var Result = (/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(Identifier)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(Identifier.substr(0,4))); return Result; }; function GetRule(SelectorText) { // NOTE(matt): Modifying CSS style // From https://stackoverflow.com/a/566445 // https://usefulangle.com/post/39/adding-css-to-stylesheet-with-javascript var Result = undefined; var StyleSheets = document.styleSheets; var cssRuleCode = document.all ? 'rules' : 'cssRules'; // account for IE and FF for(var StyleSheetIndex = StyleSheets.length - 1; StyleSheetIndex >= 0; --StyleSheetIndex) { var ThisSheet = StyleSheets[StyleSheetIndex]; if(ThisSheet.href !== null && ThisSheet.href.includes(location.hostname)) { var Rules = ThisSheet[cssRuleCode]; for(var RuleIndex = Rules.length - 1; RuleIndex >= 0; --RuleIndex) { var ThisRule = Rules[RuleIndex]; if(SelectorText === ThisRule.selectorText) { Result = ThisRule; break; } } if(Result !== undefined) { break; } } } return Result; } function GetRulesOfStyleSheetIndex(Index) { var Result = undefined; var StyleSheets = document.styleSheets; var cssRuleCode = document.all ? 'rules' : 'cssRules'; // account for IE and FF var StyleSheet = StyleSheets[Index]; if(StyleSheet) { Result = StyleSheet[cssRuleCode]; } return Result; } function GetLocalStyleSheet() { var Result; var StyleSheets = document.styleSheets; for(var StyleSheetIndex = StyleSheets.length - 1; StyleSheetIndex >= 0; --StyleSheetIndex) { var This = StyleSheets[StyleSheetIndex]; if(This.href !== null && This.href.includes(location.hostname) && !This.disabled) { Result = This; break; } } return Result; } function GetOrSetRule(SelectorText) { var Result = GetRule(SelectorText); if(Result === undefined) { var StyleSheet = GetLocalStyleSheet(); if(StyleSheet) { var cssRuleCode = document.all ? 'rules' : 'cssRules'; // account for IE and FF var Rules = StyleSheet[cssRuleCode]; var RuleIndex = StyleSheet.insertRule(SelectorText + "{}", Rules.length - 1); Result = Rules[RuleIndex]; } } return Result; } function IsInRangeEx(Min, N, Max) { return N > Min && N < Max; } /* Auto-scrolling */ var LastScrollYPos = 0; var ScrollTicking = false; var ScrollerFunction; var ScrollCondition; function ScrollTo(Element, ScrollPos, IsMobile, StickyObscuringElement) { if(Element.offsetWidth && Element.offsetHeight) { var ScrolledToTop = ScrollPos == 0; var ScrolledToBottom = (window.innerHeight + Math.ceil(window.pageYOffset)) >= document.body.scrollHeight; if(!ScrolledToTop || !ScrolledToBottom) { var Ceiling = StickyObscuringElement ? StickyObscuringElement.offsetHeight : 0; var VisibleArea = GetWindowDim(IsMobile); VisibleArea.Y -= Ceiling; var PercentageOfVisibleHeightToGather = 5; var GatherableHeight = VisibleArea.Y * PercentageOfVisibleHeightToGather / 100; var BoundingRect = Element.getBoundingClientRect(); var ElementTop = BoundingRect.top - Ceiling; var ElementBottom = ElementTop + BoundingRect.height; var UpperProtrusion = -ElementTop; var LowerProtrusion = ElementBottom - VisibleArea.Y; var DesiredScroll = null; var YOffsetFromPage = getElementYOffsetFromPage(Element); if(IsInRangeEx(0, UpperProtrusion, GatherableHeight)) { if(!ScrolledToBottom) { DesiredScroll = YOffsetFromPage - Ceiling; } } else if(IsInRangeEx(0, LowerProtrusion, GatherableHeight)) { if(!ScrolledToTop) { if(IsInRangeEx(0, UpperProtrusion + LowerProtrusion, GatherableHeight)) { DesiredScroll = YOffsetFromPage - Ceiling; } else { DesiredScroll = ScrollPos + LowerProtrusion; } } } if(DesiredScroll !== null && DesiredScroll != ScrollPos) { window.scrollTo({ top: DesiredScroll, behavior: "smooth" }); } } } } function InitScrollEventListener(Element, IsMobile, StickyObscuringElement) { window.addEventListener('scroll', function() { if(ScrollCondition == undefined || ScrollCondition == true) { LastScrollYPos = window.scrollY; if (!ScrollTicking) { window.requestAnimationFrame(function() { clearTimeout(ScrollerFunction); ScrollerFunction = setTimeout(ScrollTo, 2000, Element, LastScrollYPos, IsMobile, StickyObscuringElement); ScrollTicking = false; }); ScrollTicking = true; } } }); } /* /Auto-scrolling */ function getElementXOffsetFromPage(el) { var left = 0; do { left += el.offsetLeft; } while (el = el.offsetParent); return left; } function getElementYOffsetFromPage(el) { var top = 0; do { top += el.offsetTop; } while (el = el.offsetParent); return top; } function MaxWidthOfElement(Element, WindowDim) { // NOTE(matt): This works fine for Elements whose natural max width fills the whole line, i.e. block elements and children // thereof. To support inline elements, we'll need to mirror MaxHeightOfElement() and may as well roll the two // functions into one. var Result = 0; var OriginalWidth = Element.style.width; Element.style.width = "100%"; var NaturalMax = Element.offsetWidth; Element.style.width = OriginalWidth; var InnerWidth = WindowDim ? WindowDim.X : document.documentElement.clientWidth; Result = Math.min(NaturalMax, InnerWidth); return Result; } function MaxHeightOfElement(Element, WindowDim) { var Result = 0; var DisplaySettings = []; for(var i = 0; i < Element.children.length; ++i) { var Child = Element.children[i]; DisplaySettings.push(Child.style.display); Child.style.display = "none"; } var OriginalHeight = Element.style.height; Element.style.height = "100%"; var NaturalMax = Element.offsetHeight; Element.style.height = OriginalHeight; var InnerHeight = WindowDim ? WindowDim.Y : document.documentElement.clientHeight; if(NaturalMax > 0) { Result = Math.min(NaturalMax, InnerHeight); } else { Result = InnerHeight; } for(var i = 0; i < Element.children.length; ++i) { var Child = Element.children[i]; Child.style.display = DisplaySettings.shift(); } return Result; } function MaxDimensionsOfElement(Element, WindowDim) { var Result = { X: null, Y: null, }; Result.X = MaxWidthOfElement(Element, WindowDim); Result.Y = MaxHeightOfElement(Element, WindowDim); return Result; } function Clamp(EndA, N, EndB) { var Min = EndA < EndB ? EndA : EndB; var Max = EndA > EndB ? EndA : EndB; return N < Min ? Min : N > Max ? Max : N; } function Clamp01(N) { return N < 0 ? 0 : N > 1 ? 1 : N; } function Lerp(A, t, B) { return (1-t)*A + t*B; } function IsOverflowed(Element) { return Element.scrollHeight > Element.clientHeight || Element.scrollWidth > Element.clientWidth; } function BindHelp(Button, DocumentationContainer) { window.addEventListener("blur", function(){ Button.firstElementChild.innerText = "¿"; Button.firstElementChild.title = "Keypresses will not pass through to Cinera because focus is currently elsewhere.\n\nTo regain focus, please press Tab / Shift-Tab (multiple times) or click somewhere related to Cinera other than the video, e.g. this button"; }); window.addEventListener("focus", function(){ Button.firstElementChild.innerText = "?"; Button.firstElementChild.title = "" }); Button.addEventListener("click", function() { DocumentationContainer.classList.toggle("visible"); }) } function RGBtoHSL(colour) { var rgb = colour.slice(4, -1).split(", "); var red = rgb[0]; var green = rgb[1]; var blue = rgb[2]; var min = Math.min(red, green, blue); var max = Math.max(red, green, blue); var chroma = max - min; var hue = 0; if(max == red) { hue = ((green - blue) / chroma) % 6; } else if(max == green) { hue = ((blue - red) / chroma) + 2; } else if(max == blue) { hue = ((red - green) / chroma) + 4; } var saturation = chroma / 255 * 100; hue = (hue * 60) < 0 ? 360 + (hue * 60) : (hue * 60); return [hue, saturation] } function getBackgroundColourRGB(element) { var Colour = getComputedStyle(element).getPropertyValue("background-color"); var depth = 0; while((Colour == "transparent" || Colour == "rgba(0, 0, 0, 0)") && depth <= 4) { element = element.parentNode; Colour = getComputedStyle(element).getPropertyValue("background-color"); ++depth; } var Staging = Colour.slice(4, -1).split(", "); var Result = { R: parseInt(Staging[0]), G: parseInt(Staging[1]), B: parseInt(Staging[2]), }; return Result; } function getBackgroundBrightness(element) { var Colour = getBackgroundColourRGB(element); var Result = Math.sqrt(Colour.R * Colour.R * .241 + Colour.G * Colour.G * .691 + Colour.B * Colour.B * .068); return Result; } function setTextLightness(textElement) { var textHue = textElement.getAttribute("data-hue"); var textSaturation = textElement.getAttribute("data-saturation"); if(getBackgroundBrightness(textElement.parentNode) < 127) { textElement.style.color = ("hsl(" + textHue + ", " + textSaturation + ", 76%)"); } else { textElement.style.color = ("hsl(" + textHue + ", " + textSaturation + ", 24%)"); } } function setDotLightness(topicDot) { var Hue = RGBtoHSL(getComputedStyle(topicDot).getPropertyValue("background-color"))[0]; var Saturation = RGBtoHSL(getComputedStyle(topicDot).getPropertyValue("background-color"))[1]; if(getBackgroundBrightness(topicDot.parentNode) < 127) { topicDot.style.backgroundColor = ("hsl(" + Hue + ", " + Saturation + "%, 76%)"); topicDot.style.borderColor = ("hsl(" + Hue + ", " + Saturation + "%, 76%)"); } else { topicDot.style.backgroundColor = ("hsl(" + Hue + ", " + Saturation + "%, 47%)"); topicDot.style.borderColor = ("hsl(" + Hue + ", " + Saturation + "%, 47%)"); } }