315 lines
12 KiB
JavaScript
315 lines
12 KiB
JavaScript
var animationState = {};
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animationState.reset = function (engine) {
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if ('string' === typeof engine) {
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this.defaultEngine = engine;
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}
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this.defaults = {};
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this.displayList = [];
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this.displayDict = {};
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this.start = null;
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this.time = 0;
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this.timeline = [];
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this.timelineIndex = 0;
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this.requestID = null;
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this.paused = false;
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this.displayEngine = 'undefined' === typeof engine ? this.defaultEngine : engine;
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}
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function addActions(frame, timeline) {
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var keyframe = keyframes[frame];
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var len = keyframe.length;
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for (var i = 0; i < len; ++i) {
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var action = keyframe[i];
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loopOver(action, timeline);
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}
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}
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function animateList(now) {
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if (animationState.paused) {
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return;
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}
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if (animationState.start == null) {
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animationState.start = now - animationState.time;
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}
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animationState.time = now - animationState.start;
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var stillAnimating = false;
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for (var index = animationState.timelineIndex; index < animationState.timeline.length; ++index) {
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var animation = animationState.timeline[index];
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if (animation.time > animationState.time) {
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stillAnimating = true;
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break;
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}
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if (animation.time + animation.duration < animationState.time) {
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if (animation.finalized) {
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continue;
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}
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animation.finalized = true;
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}
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stillAnimating = true;
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var actions = animation.actions;
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for (var aIndex = 0; aIndex < actions.length; ++aIndex) {
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var action = actions[aIndex];
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var hasDraw = 'draw' in action;
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var hasRef = 'ref' in action;
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var displayIndex;
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if (hasDraw) {
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var ref = hasRef ? action.ref : "anonymous_" + index + "_" + aIndex;
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assert('string' == typeof(ref));
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if (ref in animationState.displayDict) {
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displayIndex = animationState.displayDict[ref];
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} else {
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assert('string' == typeof(action.draw));
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var draw = (new Function("return " + action.draw))();
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assert('object' == typeof(draw));
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var paint;
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if ('paint' in action) {
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assert('string' == typeof(action.paint));
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paint = (new Function("return " + action.paint))();
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assert('object' == typeof(paint) && !isArray(paint));
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} else {
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paint = animationState.defaults.paint;
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}
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displayIndex = animationState.displayList.length;
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animationState.displayList.push( { "ref":ref, "draw":draw, "paint":paint,
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"drawSpec":action.draw, "paintSpec":action.paint,
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"drawCopied":false, "paintCopied":false,
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"drawDirty":true, "paintDirty":true, "once":false } );
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animationState.displayDict[ref] = displayIndex;
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}
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} else if (hasRef) {
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assert('string' == typeof(action.ref));
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displayIndex = animationState.displayDict[action.ref];
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} else {
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assert(actions.length == 1);
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for (var prop in action) {
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if ('paint' == prop) {
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assert('string' == typeof(action[prop]));
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var obj = (new Function("return " + action[prop]))();
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assert('object' == typeof(obj) && !isArray(obj));
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animationState.defaults[prop] = obj;
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} else {
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animationState.defaults[prop] = action[prop];
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}
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}
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continue;
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}
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var targetSpec = 'target' in action ? action.target : animationState.defaults.target;
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assert(targetSpec);
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assert('string' == typeof(targetSpec));
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assert(displayIndex < animationState.displayList.length);
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var display = animationState.displayList[displayIndex];
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var modDraw = targetSpec.startsWith('draw');
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assert(modDraw || targetSpec.startsWith('paint'));
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var modType = modDraw ? "draw" : "paint";
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var copied = modDraw ? display.drawCopied : action.paintCopied;
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if (!copied) {
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var copy;
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if (!modDraw || display.drawSpec.startsWith("text")) {
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copy = {};
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var original = modDraw ? display.draw : display.paint;
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for (var p in original) {
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copy[p] = original[p];
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}
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} else if (display.drawSpec.startsWith("paths")) {
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copy = [];
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for (var i = 0; i < display.draw.length; ++i) {
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var curves = display.draw[i];
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var curve = Object.keys(curves)[0];
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copy[i] = {};
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copy[i][curve] = curves[curve].slice(0); // clone the array of curves
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}
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} else {
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assert(display.drawSpec.startsWith("pictures"));
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copy = [];
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for (var i = 0; i < display.draw.length; ++i) {
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var entry = display.draw[i];
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copy[i] = { "draw":entry.draw, "paint":entry.paint };
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}
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}
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display[modType] = copy;
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display[modType + "Copied"] = true;
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}
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var targetField, targetObject, fieldOffset;
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if (targetSpec.endsWith("]")) {
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fieldOffset = targetSpec.lastIndexOf("[");
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assert(fieldOffset >= 0);
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targetField = targetSpec.substring(fieldOffset + 1, targetSpec.length - 1);
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var arrayIndex = +targetField;
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if (!isNaN(arrayIndex) && targetField.length > 0) {
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targetField = arrayIndex;
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}
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} else {
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fieldOffset = targetSpec.lastIndexOf(".");
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if (fieldOffset >= 0) {
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targetField = targetSpec.substring(fieldOffset + 1, targetSpec.length);
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} else {
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targetObject = display;
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targetField = targetSpec;
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}
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}
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if (fieldOffset >= 0) {
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var sub = targetSpec.substring(0, fieldOffset);
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targetObject = (new Function('display', "return display." + sub))(display);
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}
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assert(null != targetObject[targetField]);
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if (!('start' in action) || action.start < animation.time) {
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for (var p in animationState.defaults) {
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if ('draw' == p || 'paint' == p || 'ref' == p) {
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continue;
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}
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assert('range' == p || 'target' == p || 'formula' == p || 'params' == p);
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if (!(p in action)) {
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action[p] = animationState.defaults[p];
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}
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}
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if ('number' == typeof(action.formula)) {
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targetObject[targetField] = action.formula;
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action.once = true;
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}
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action.start = animation.time;
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}
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if (action.once) {
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continue;
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}
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var value = Math.min(1, (animationState.time - animation.time) / animation.duration);
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var scaled = action.range[0] + (action.range[1] - action.range[0]) * value;
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if ('params' in action) {
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if (!('func' in action)) {
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if (isArray(action.params)) {
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action.funcParams = [];
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var len = action.params.length;
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for (var i = 0; i < len; ++i) {
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action.funcParams[i] = 'target' == action.params[i]
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? targetObject[targetField]
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: (new Function("return " + action.params[i]))();
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}
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} else {
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action.funcParams = 'target' == action.params
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? targetObject[targetField]
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: (new Function("return " + action.params))();
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}
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assert('formula' in action && 'string' == typeof(action.formula));
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// evaluate inline function to get value
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action.func = new Function('value', 'params', "return " + action.formula);
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}
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scaled = action.func(scaled, action.funcParams);
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}
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if (targetObject[targetField] != scaled) {
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if (modDraw) {
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display.drawDirty = true;
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} else {
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display.paintDirty = true;
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}
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targetObject[targetField] = scaled;
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}
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}
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}
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displayBackend(animationState.displayEngine, animationState.displayList);
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if (stillAnimating) {
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animationState.requestID = requestAnimationFrame(animateList);
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}
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}
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function flattenPaint(paint) {
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if (!paint.paint) {
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return;
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}
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var parent = paints[paint.paint];
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flattenPaint(parent);
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for (var prop in parent) {
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if (!(prop in paint)) {
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paint[prop] = parent[prop];
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}
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}
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paint.paint = null;
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}
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function init(engine, keyframe) {
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animationState.reset(engine);
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setupPaint();
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setupBackend(animationState.displayEngine);
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keyframeInit(keyframe);
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}
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function keyframeInit(frame) {
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animationState.reset();
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addActions("_default", animationState.timeline);
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addActions(frame, animationState.timeline);
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for (var index = 0; index < animationState.timeline.length; ++index) {
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animationState.timeline[index].position = index;
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}
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animationState.timeline.sort(function(a, b) {
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if (a.time == b.time) {
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return a.position - b.position;
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}
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return a.time - b.time;
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});
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keyframeBackendInit(animationState.displayEngine, animationState.displayList,
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keyframes[frame][0]);
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animationState.requestID = requestAnimationFrame(animateList);
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}
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function loopAddProp(action, propName) {
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var funcStr = "";
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var prop = action[propName];
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if ('draw' != propName && isArray(prop)) {
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funcStr += '[';
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for (var index = 0; index < prop.length; ++index) {
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funcStr += loopAddProp(prop, index);
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if (index + 1 < prop.length) {
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funcStr += ", ";
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}
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}
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funcStr += ']';
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return funcStr;
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}
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assert("object" != typeof(prop));
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var useString = "string" == typeof(prop) && isAlpha(prop.charCodeAt(0));
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if (useString) {
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funcStr += "'";
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}
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funcStr += prop;
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if (useString) {
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funcStr += "'";
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}
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return funcStr;
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}
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function loopOver(rec, timeline) {
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var funcStr = "";
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if (rec.for) {
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funcStr += "for (" + rec.for[0] + "; " + rec.for[1] + "; " + rec.for[2] + ") {\n";
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}
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funcStr += " var time = " + ('time' in rec ? rec.time : 0) + ";\n";
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funcStr += " var duration = " + ('duration' in rec ? rec.duration : 0) + ";\n";
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funcStr += " var actions = [];\n";
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var len = rec.actions.length;
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for (var i = 0; i < len; ++i) {
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funcStr += " var action" + i + " = {\n";
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var action = rec.actions[i];
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for (var p in action) {
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funcStr += " '" + p + "':";
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funcStr += loopAddProp(action, p);
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funcStr += ",\n";
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}
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funcStr = funcStr.substring(0, funcStr.length - 2);
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funcStr += "\n };\n";
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funcStr += " actions.push(action" + i + ");\n";
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}
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funcStr += " timeline.push( { 'time':time, 'duration':duration, 'actions':actions,"
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+ "'finalized':false } );\n";
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if (rec.for) {
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funcStr += "}\n";
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}
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var func = new Function('rec', 'timeline', funcStr);
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func(rec, timeline);
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}
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function setupPaint() {
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for (var prop in paints) {
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flattenPaint(paints[prop]);
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}
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}
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