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https://github.com/pcottle/learnGitBranching.git
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Peter Cottle
parent
9cb146462a
commit
8280f4379d
6 changed files with 2911 additions and 1423 deletions
423
src/js/visuals/visNode.js
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423
src/js/visuals/visNode.js
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var _ = require('underscore');
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var Backbone = require('backbone');
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var GRAPHICS = require('../util/constants').GRAPHICS;
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var VisBase = require('../visuals/tree').VisBase;
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var VisNode = VisBase.extend({
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defaults: {
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depth: undefined,
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maxWidth: null,
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outgoingEdges: null,
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circle: null,
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text: null,
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id: null,
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pos: null,
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radius: null,
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commit: null,
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animationSpeed: GRAPHICS.defaultAnimationTime,
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animationEasing: GRAPHICS.defaultEasing,
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fill: GRAPHICS.defaultNodeFill,
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'stroke-width': GRAPHICS.defaultNodeStrokeWidth,
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stroke: GRAPHICS.defaultNodeStroke
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},
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getID: function() {
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return this.get('id');
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},
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validateAtInit: function() {
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if (!this.get('id')) {
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throw new Error('need id for mapping');
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}
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if (!this.get('commit')) {
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throw new Error('need commit for linking');
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}
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if (!this.get('pos')) {
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this.set('pos', {
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x: Math.random(),
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y: Math.random()
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});
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}
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},
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initialize: function() {
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this.validateAtInit();
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// shorthand for the main objects
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this.gitVisuals = this.get('gitVisuals');
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this.gitEngine = this.get('gitEngine');
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this.set('outgoingEdges', []);
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},
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setDepth: function(depth) {
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// for merge commits we need to max the depths across all
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this.set('depth', Math.max(this.get('depth') || 0, depth));
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},
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setDepthBasedOn: function(depthIncrement) {
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if (this.get('depth') === undefined) {
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debugger;
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throw new Error('no depth yet!');
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}
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var pos = this.get('pos');
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pos.y = this.get('depth') * depthIncrement;
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},
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getMaxWidthScaled: function() {
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// returns our max width scaled based on if we are visible
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// from a branch or not
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var stat = this.gitVisuals.getCommitUpstreamStatus(this.get('commit'));
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var map = {
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branch: 1,
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head: 0.3,
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none: 0.1
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};
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if (map[stat] === undefined) { throw new Error('bad stat'); }
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return map[stat] * this.get('maxWidth');
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},
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toFront: function() {
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this.get('circle').toFront();
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this.get('text').toFront();
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},
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getOpacity: function() {
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var map = {
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'branch': 1,
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'head': GRAPHICS.upstreamHeadOpacity,
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'none': GRAPHICS.upstreamNoneOpacity
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};
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var stat = this.gitVisuals.getCommitUpstreamStatus(this.get('commit'));
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if (map[stat] === undefined) {
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throw new Error('invalid status');
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}
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return map[stat];
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},
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getTextScreenCoords: function() {
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return this.getScreenCoords();
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},
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getAttributes: function() {
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var pos = this.getScreenCoords();
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var textPos = this.getTextScreenCoords();
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var opacity = this.getOpacity();
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return {
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circle: {
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cx: pos.x,
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cy: pos.y,
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opacity: opacity,
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r: this.getRadius(),
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fill: this.getFill(),
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'stroke-width': this.get('stroke-width'),
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stroke: this.get('stroke')
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},
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text: {
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x: textPos.x,
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y: textPos.y,
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opacity: opacity
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}
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};
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},
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highlightTo: function(visObj, speed, easing) {
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// a small function to highlight the color of a node for demonstration purposes
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var color = visObj.get('fill');
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var attr = {
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circle: {
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fill: color,
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stroke: color,
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'stroke-width': this.get('stroke-width') * 5
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},
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text: {}
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};
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this.animateToAttr(attr, speed, easing);
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},
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animateUpdatedPosition: function(speed, easing) {
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var attr = this.getAttributes();
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this.animateToAttr(attr, speed, easing);
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},
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animateFromAttrToAttr: function(fromAttr, toAttr, speed, easing) {
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// an animation of 0 is essentially setting the attribute directly
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this.animateToAttr(fromAttr, 0);
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this.animateToAttr(toAttr, speed, easing);
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},
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animateToSnapshot: function(snapShot, speed, easing) {
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if (!snapShot[this.getID()]) {
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return;
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}
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this.animateToAttr(snapShot[this.getID()], speed, easing);
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},
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animateToAttr: function(attr, speed, easing) {
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if (speed === 0) {
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this.get('circle').attr(attr.circle);
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this.get('text').attr(attr.text);
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return;
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}
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var s = speed !== undefined ? speed : this.get('animationSpeed');
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var e = easing || this.get('animationEasing');
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this.get('circle').stop().animate(attr.circle, s, e);
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this.get('text').stop().animate(attr.text, s, e);
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// animate the x attribute without bouncing so it looks like there's
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// gravity in only one direction. Just a small animation polish
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this.get('circle').animate(attr.circle.cx, s, 'easeInOut');
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this.get('text').animate(attr.text.x, s, 'easeInOut');
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},
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getScreenCoords: function() {
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var pos = this.get('pos');
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return this.gitVisuals.toScreenCoords(pos);
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},
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getRadius: function() {
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return this.get('radius') || GRAPHICS.nodeRadius;
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},
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getParentScreenCoords: function() {
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return this.get('commit').get('parents')[0].get('visNode').getScreenCoords();
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},
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setBirthPosition: function() {
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// utility method for animating it out from underneath a parent
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var parentCoords = this.getParentScreenCoords();
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this.get('circle').attr({
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cx: parentCoords.x,
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cy: parentCoords.y,
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opacity: 0,
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r: 0
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});
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this.get('text').attr({
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x: parentCoords.x,
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y: parentCoords.y,
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opacity: 0
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});
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},
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setBirthFromSnapshot: function(beforeSnapshot) {
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// first get parent attribute
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// woof bad data access. TODO
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var parentID = this.get('commit').get('parents')[0].get('visNode').getID();
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var parentAttr = beforeSnapshot[parentID];
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// then set myself faded on top of parent
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this.get('circle').attr({
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opacity: 0,
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r: 0,
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cx: parentAttr.circle.cx,
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cy: parentAttr.circle.cy
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});
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this.get('text').attr({
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opacity: 0,
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x: parentAttr.text.x,
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y: parentAttr.text.y
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});
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// then do edges
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var parentCoords = {
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x: parentAttr.circle.cx,
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y: parentAttr.circle.cy
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};
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this.setOutgoingEdgesBirthPosition(parentCoords);
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},
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setBirth: function() {
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this.setBirthPosition();
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this.setOutgoingEdgesBirthPosition(this.getParentScreenCoords());
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},
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setOutgoingEdgesOpacity: function(opacity) {
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_.each(this.get('outgoingEdges'), function(edge) {
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edge.setOpacity(opacity);
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});
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},
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animateOutgoingEdgesToAttr: function(snapShot, speed, easing) {
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_.each(this.get('outgoingEdges'), function(edge) {
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var attr = snapShot[edge.getID()];
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edge.animateToAttr(attr);
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}, this);
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},
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animateOutgoingEdges: function(speed, easing) {
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_.each(this.get('outgoingEdges'), function(edge) {
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edge.animateUpdatedPath(speed, easing);
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}, this);
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},
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animateOutgoingEdgesFromSnapshot: function(snapshot, speed, easing) {
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_.each(this.get('outgoingEdges'), function(edge) {
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var attr = snapshot[edge.getID()];
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edge.animateToAttr(attr, speed, easing);
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}, this);
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},
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setOutgoingEdgesBirthPosition: function(parentCoords) {
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_.each(this.get('outgoingEdges'), function(edge) {
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var headPos = edge.get('head').getScreenCoords();
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var path = edge.genSmoothBezierPathStringFromCoords(parentCoords, headPos);
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edge.get('path').stop().attr({
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path: path,
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opacity: 0
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});
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}, this);
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},
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parentInFront: function() {
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// woof! talk about bad data access
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this.get('commit').get('parents')[0].get('visNode').toFront();
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},
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getFontSize: function(str) {
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if (str.length < 3) {
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return 12;
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} else if (str.length < 5) {
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return 10;
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} else {
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return 8;
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}
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},
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getFill: function() {
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// first get our status, might be easy from this
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var stat = this.gitVisuals.getCommitUpstreamStatus(this.get('commit'));
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if (stat == 'head') {
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return GRAPHICS.headRectFill;
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} else if (stat == 'none') {
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return GRAPHICS.orphanNodeFill;
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}
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// now we need to get branch hues
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return this.gitVisuals.getBlendedHuesForCommit(this.get('commit'));
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},
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attachClickHandlers: function() {
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var commandStr = 'git show ' + this.get('commit').get('id');
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var Main = require('../app');
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_.each([this.get('circle'), this.get('text')], function(rObj) {
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rObj.click(function() {
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Main.getEvents().trigger('processCommandFromEvent', commandStr);
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});
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});
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},
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setOpacity: function(opacity) {
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opacity = (opacity === undefined) ? 1 : opacity;
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// set the opacity on my stuff
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var keys = ['circle', 'text'];
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_.each(keys, function(key) {
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this.get(key).attr({
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opacity: opacity
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});
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}, this);
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},
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remove: function() {
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this.removeKeys(['circle'], ['text']);
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// needs a manual removal of text for whatever reason
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this.get('text').remove();
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this.gitVisuals.removeVisNode(this);
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},
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removeAll: function() {
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this.remove();
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_.each(this.get('outgoingEdges'), function(edge) {
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edge.remove();
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}, this);
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},
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getExplodeStepFunc: function() {
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var circle = this.get('circle');
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// decide on a speed
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var speedMag = 20;
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// aim upwards
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var angle = Math.PI + Math.random() * 1 * Math.PI;
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var gravity = 1 / 5;
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var drag = 1 / 100;
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var vx = speedMag * Math.cos(angle);
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var vy = speedMag * Math.sin(angle);
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var x = circle.attr('cx');
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var y = circle.attr('cy');
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var maxWidth = this.gitVisuals.paper.width;
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var maxHeight = this.gitVisuals.paper.height;
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var elasticity = 0.8;
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var dt = 1.0;
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var stepFunc = function() {
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// lol epic runge kutta here... not
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vy += gravity * dt - drag * vy;
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vx -= drag * vx;
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x += vx * dt;
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y += vy * dt;
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if (x < 0 || x > maxWidth) {
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vx = elasticity * -vx;
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x = (x < 0) ? 0 : maxWidth;
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}
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if (y < 0 || y > maxHeight) {
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vy = elasticity * -vy;
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y = (y < 0) ? 0 : maxHeight;
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}
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circle.attr({
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cx: x,
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cy: y
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});
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// continuation calculation
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return (vx * vx + vy * vy > 0.01) ? true : false;
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};
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return stepFunc;
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},
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genGraphics: function() {
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var paper = this.gitVisuals.paper;
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var pos = this.getScreenCoords();
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var textPos = this.getTextScreenCoords();
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var circle = paper.circle(
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pos.x,
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pos.y,
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this.getRadius()
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).attr(this.getAttributes().circle);
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var text = paper.text(textPos.x, textPos.y, String(this.get('id')));
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text.attr({
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'font-size': this.getFontSize(this.get('id')),
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'font-weight': 'bold',
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'font-family': 'Monaco, Courier, font-monospace',
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opacity: this.getOpacity()
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});
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this.set('circle', circle);
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this.set('text', text);
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this.attachClickHandlers();
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}
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});
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exports.VisNode = VisNode;
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