simple overlayed globe canvas

_.md

[ Launch: simple overlayed globe canvas ] 4679442 by mxfh
[ Launch: simple globe canvas ] 4670598 by ejfox
[ Launch: simple globe ] 4669854 by enjalot
[ Launch: Tributary inlet ] 4661803 by enjalot

config.json

{"description":"simple overlayed globe canvas","endpoint":"","display":"canvas","public":true,"require":[{"name":"topojson","url":"http://d3js.org/topojson.v0.min.js"},{"name":"d3.geo.projection","url":"http://d3js.org/d3.geo.projection.v0.min.js"}],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"world110.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"leap.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"globes.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"ne_110m_world.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"ne_110m_world110m.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01}

inlet.js

// simple overlayed globe canvas
// by Max Friedrich Hartmann
// github/twitter: @mxfh
// comments are welcome my javascript skills need some serious improvement

// uses d3.js and topojson
// http://bl.ocks.org/4188334
// basic framework based on simple globe canvas by ejfox 
// http://tributary.io/inlet/4670598

// TODO: improve mouse interaction
// TODO: add cities+labels
// TODO: add circles of latitude
// TODO: optimize canvas speed
// TODO: add mirror option
// TODE: add gradient toggle key

// A faster loading Version can be found here:
//
// http://mxfh.github.com/d3canvasglobes/
//
// gotta love Tributary for getting me started

var world, globe, countries,
λA, φA, γA, λB, φB, γB,
rotationA, rotationB, projectionA, projectionB,
context, pathA, pathB,
x, y, xtmp, ytmp, xrel, yrel, flag, shiftflag, altflag;
flag = 0;
shiftflag = 0;
altflag = 0;

// λ (longitude) and φ (latitude) of projection center, rotation angle (γ) counter-clockwise in degrees
// inital seetings
if (λA  === undefined) { 
λA = 0, φA = -10, γA = 0, λB = -50, φB = -13, γB = 44; // African and South American Coastlines
}

document.onkeydown = function(evt) {
    evt = evt || window.event;
    if (evt.keyCode === 16) {
        shiftflag = 1;
    }
    if (evt.keyCode === 18) {
        altflag = 1;
    }
    // reset on r or 0
    if (evt.keyCode === 82 || evt.keyCode === 48) { 
      λA = 0; φA = 0; γA = 0; λB = 0; φB = 0; γB = 0;
      drawglobes(λA,φA,γA,λB,φB,γB);
    }
    if (evt.keyCode === 49) {
      λA = 0; φA = -10; γA = 0; λB = -50; φB = -13; γB = 44; // Preset 1: African and South American Coastlines
      drawglobes(λA,φA,γA,λB,φB,γB);
    }
    if (evt.keyCode === 50) {
      λA = 15; φA = 10; γA = 0; λB = -100; φB = 10; γB = 0; // Preset 2: Europe - America
      drawglobes(λA,φA,γA,λB,φB,γB);
    }
    if (evt.keyCode === 51) {
      λA = 0; φA = 90; γA = 0; λB = 120; φB = -90; γB = 0; // Preset 3: Overlayed poles
      drawglobes(λA,φA,γA,λB,φB,γB);
    }
};

document.onkeyup = function(evt) {
    evt = evt || window.event;
    if (evt.keyCode == 16) {
        shiftflag = 0;
    }
    if (evt.keyCode === 18) {
        altflag = 0;
    }
};

world = tributary.world110;
globe = {type: "Sphere"};
countries = topojson.object(world, world.objects.countries);

var displayElement = document.getElementById("display");
var canvasElement = displayElement.getElementsByClassName("tributary_canvas")[0];
context = tributary.ctx;
function drawglobes(λA,φA,γA,λB,φB,γB){
  context.clearRect(0, 0, 1000, 1000);
  context.fillText( "Drag Mouse to move λ (longitude) and φ (latitude) of projection center." , 670, 20);
  context.fillText( "Hold [Shift] to switch globe, hold [Alt] for rotation γ around center." , 693, 32);
  context.fillText( "For presets press [1] - [3], [R] or [0] resets both globes to origin." , 711, 44);
  rotationA = [-λA, -φA, γA];
  rotationB = [-λB, -φB, γB];
  // todo: put globe in function pass color and rotations as parameters
  projectionA = d3.geo.orthographic().rotate(rotationA).scale(478).translate([495, 490]).clipAngle(88);
  projectionB = d3.geo.orthographic().rotate(rotationB).scale(478).translate([495, 490]).clipAngle(88);
  pathA = d3.geo.path().projection(projectionA).context(context);
  pathB = d3.geo.path().projection(projectionB).context(context);
  //console.log("rota:", rotationA, "rotB:", rotationB);
  context.beginPath();
  context.fillStyle = "#5CA2C9";
  pathA(countries);
  context.fill();
  context.beginPath();
  context.fillStyle = "rgba(230, 90, 10, 0.7)";
  pathB(countries);
  context.fill();
  context.strokeStyle = "rgba(0, 0, 0, 0.2)";
  context.beginPath();
  pathA(globe);
  gradient_water = context.createRadialGradient(350,100,0,495,490,480);
  gradient_water.addColorStop(0, "rgba(78, 225, 216, 0)");
  gradient_water.addColorStop(0.4, "rgba(58, 205, 196, 0.05)");
  gradient_water.addColorStop(0.8, "rgba(38, 185, 176, 0.1)");
  gradient_water.addColorStop(0.95, "rgba(18, 165, 156, 0.3)");
  gradient_water.addColorStop(1, "rgba(0, 145, 136, 0.7)");
  context.fillStyle = gradient_water;
  context.fill(); 
  context.stroke();
};
drawglobes(λA,φA,γA,λB,φB,γB);
function renderPositionInfo() {
  context.clearRect ( 20 , 10 , 250 , 60 );
  context.fillStyle = "rgba(0, 0, 0, 0.7)";
  if (x !== undefined) {context.fillText("x : " + x , 20, 20);}
  if (y !== undefined) {context.fillText("y : " + y , 20, 32);}
  context.fillText("λᴬ : " + Math.round(λA) , 60, 20);
  context.fillText("λᴮ : " + Math.round(λB) , 100, 20);
  context.fillText("φᴬ : " + Math.round(φA) , 60, 32);
  context.fillText("φᴮ : " + Math.round(φB) , 100, 32);
  if (γA !== 0) {context.fillText("γᴬ : " + Math.round(γA) , 60, 44); }
  if (γB !== 0) {context.fillText("γᴮ : " + Math.round(γB) , 100, 44); }
}
renderPositionInfo();

function track(e) {
  x = e.offsetX||e.layerX;
  y = e.offsetY||e.layerY;
  var mousefactor = 80;
  if(flag === 1){
    xrel = x-xtmp;
    yrel = y-ytmp;
    if (shiftflag === 0) {
      if (altflag === 0) {
        λA = λA - xrel/mousefactor;
        φA = φA + yrel/mousefactor;
      } 
      if (altflag === 1) {
        γA = γA - xrel/mousefactor;
      } 
    }
    if (shiftflag === 1) {
      if (altflag === 0) {
        λB = λB - xrel/mousefactor;
        φB = φB + yrel/mousefactor;
      }
      if (altflag === 1) {
        γB = γB - xrel/mousefactor;
      } 
    }
    //console.log("drag",xrel, yrel,canvasElement.width);
    drawglobes(λA,φA,γA,λB,φB,γB);
  }
  renderPositionInfo();
}

canvasElement.addEventListener("mousemove", track, false);
canvasElement.addEventListener("mousedown", function(e){
  xtmp = e.offsetX||e.layerX;
  ytmp = e.offsetY||e.layerY;
  //console.log("click",xtmp,ytmp);
  flag = 1;
}, false);
canvasElement.addEventListener("mouseup", function(){
  flag = 0;
}, false);
//console.log("script executed");

world110.json