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hexmap.html
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hexmap.html
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<!DOCTYPE HTML>
<html>
<head>
<title></title>
<meta http-equiv="X-UA-Compatible" content="IE=9" />
<style>
#canvas1{
border: 1px black solid;
width: 1000px;
height: 500px;
float:left;
}
#mapMouseCoordTracker{
display:none;
}
#mapToolbar{
float:left;
}
#mapToolbar button{
display: block;
width: 25px;
height: 25px;
text-align: center;
}
div.clear{
clear:both
}
</style>
<script>
var Viewport = {
xmin:0,
ymin:0,
width:1000,
height:500,
scale: 50
}
var map = {
tilesize: 10, //tile bounding box is 10x10
xmin: 0,
ymin: 0,
xmax: 25,
ymax: 25
}
/*
* draws a hex to the rendering context
* ctx: 2D canvas context
* column Number: hex column
* row Number: hex row
* scale Number: length of one side of a hex
* fill Boolean: fill the hex interior
* showCoords Boolean: display the hex coordinates
*/
function drawHex(ctx,column,row,scale,fill,showCoords){
//if(x%2!=y%2) return;
var yoffset = 0.5*Math.sqrt(3);
var xscaled = column*scale;
var yscaled = row*scale;
var yoffsetScaled = Math.floor(0.5*Math.sqrt(3)*scale);
//center of hex cells are 2 units apart
var centerX=column*scale*1.5;;
var centerY;
if(column%2){ //odd numbered columns
centerY = row*scale*yoffset*2;
}else{
centerY = row*scale*yoffset*2+0.5*scale*Math.sqrt(3);
}
var unitPoints = [
{x:-1,y:0},
{x:-0.5,y:yoffset},
{x:0.5,y:yoffset},
{x:1,y:0},
{x:0.5,y:-1*yoffset},
{x:-0.5,y:-1*yoffset}
];
var scaledPoints = [
{x:centerX+unitPoints[0]["x"]*scale,y:centerY+unitPoints[0]["y"]*scale},
{x:centerX+unitPoints[1]["x"]*scale,y:centerY+unitPoints[1]["y"]*scale},
{x:centerX+unitPoints[2]["x"]*scale,y:centerY+unitPoints[2]["y"]*scale},
{x:centerX+unitPoints[3]["x"]*scale,y:centerY+unitPoints[3]["y"]*scale},
{x:centerX+unitPoints[4]["x"]*scale,y:centerY+unitPoints[4]["y"]*scale},
{x:centerX+unitPoints[5]["x"]*scale,y:centerY+unitPoints[5]["y"]*scale}
];
ctx.beginPath();
ctx.moveTo(scaledPoints[0]["x"],scaledPoints[0]["y"]);
ctx.lineTo(scaledPoints[1]["x"],scaledPoints[1]["y"]);
ctx.lineTo(scaledPoints[2]["x"],scaledPoints[2]["y"]);
ctx.lineTo(scaledPoints[3]["x"],scaledPoints[3]["y"]);
ctx.lineTo(scaledPoints[4]["x"],scaledPoints[4]["y"]);
ctx.lineTo(scaledPoints[5]["x"],scaledPoints[5]["y"]);
ctx.closePath();
ctx.stroke();
if(fill){
ctx.fill();
}
if(showCoords&&scale>25){
var oldFill=ctx.fillStyle;
ctx.fillStyle=ctx.strokeStyle;
ctx.textAlign="center";
ctx.fillText((column>9?"":"0")+column+(row>9?"":"0")+row,centerX,centerY-unitPoints[1]["y"]*scale+20);
ctx.fillStyle=oldFill;
}
}
/*
* returns the hex map coordinate (ccrr) for the provided screen coordinates
* at the specified scale based on a top-left origin
* scale represents the length of one side of a hex
*/
function getHexCoordinate(x,y,scale){
var baseRowHeight = scale*0.5*Math.sqrt(3); //half height of a hex
var subrow = Math.floor((y)/baseRowHeight);
var subcol = Math.floor(x/(scale*0.5));
var r1 = subrow%2;
var r=0,c=0;
var r=subrow;
var subx = 0;
var suby = 0;
var baseColWidth = scale*1.5; //width of center rectangle in a hex plus one side
var c1 = (x+scale)/baseColWidth; //add scale to x because the center of origin hex is at 0,0
var c1Rounded=Math.floor(c1);
var esty=0;
if(c1-c1Rounded<=0.333333333333){//ambiguous, value is either Math.Floor(c1) or Math.floor(c1)-1
subx = x-subcol*scale*0.5;
suby = Math.floor(y-subrow*baseRowHeight);
c=(c1Rounded-1)+" or "+c1Rounded;
//even subrow leans left, odd leans right
//slope is 0.5*scale; negative for left leaning, positive for right
if(subrow%2){
esty=Math.floor(baseRowHeight-(subx*baseRowHeight/0.5)/scale);
if(suby>esty){
c=Math.floor(c1);
}else{
c=Math.floor(c1)-1;
}
}
else{
esty=Math.floor((subx*baseRowHeight/0.5)/scale);
if(suby>esty){
c=Math.floor(c1);
}else{
c=Math.floor(c1)-1;
}
}
}
else{
c=c1Rounded;
}
//adjust row numbers
if(c%2){
r=Math.floor(subrow/2)+subrow%2;
}else{
if(subrow%2)
r=subrow-1;
else
r=subrow;
//r=r/2;
r=(subrow%2?subrow-1:subrow)/2;
}
return {r:r,c:c,subrow:subrow,subcol:subcol,subx:subx,suby:suby,esty:esty};
}
function drawMap(){
var canvasEle = document.getElementById("canvas1");
var ctx = canvasEle.getContext("2d");
ctx.fillStyle="#000000";
ctx.fillRect(0,0,canvasEle.width,canvasEle.height);
ctx.lineWidth = 1;
ctx.strokeStyle = "#FFFFFF";
ctx.textColor="#FFFFFF";
for (var i=0;i<20;i++){
for (var j=0;j<20;j++){
drawHex(ctx,i,j,Viewport.scale,false,true);
}
}
drawPositionTest();
}
/*
* Draw a representation of the upper-left hex at 0101 and surrounding
* hexes.
*/
function drawPositionTest(){
var positionTest = document.getElementById("mapMouseCoordTracker");
var scale = Viewport.scale;
var width = (3)*scale;
var height = 2*Math.sqrt(3)*scale;
positionTest.width=width;
positionTest.height=height;
var ctx = positionTest.getContext("2d");
ctx.fillStyle="#000000";
ctx.fillRect(0,0,Viewport.scale*4,height);
ctx.lineWidth = 0;
ctx.strokeStyle = "#FFFFFF";
ctx.textColor="#000000";
ctx.fillStyle="#FF0000";
drawHex(ctx,0,0,Viewport.scale,true,false);
ctx.fillStyle="#00FF00";
drawHex(ctx,1,0,Viewport.scale,true,false);
ctx.fillStyle="#0000FF";
drawHex(ctx,2,0,Viewport.scale,true,false);
ctx.fillStyle="#00FFFF";
drawHex(ctx,2,1,Viewport.scale,true,false);
ctx.fillStyle="#FF00FF";
drawHex(ctx,1,2,Viewport.scale,true,false);
ctx.fillStyle="#FFFF00";
drawHex(ctx,0,1,Viewport.scale,true,false);
ctx.fillStyle="#FFFFFF";
drawHex(ctx,1,1,Viewport.scale,true,false);
}
/*
* Determine the hex-map coordinate using a color map of the scaled unit hex
* and surrounding hexes.
*
* 1) translate coordinates to be relative to hex at 0101
* 2) Check color value in the mapMouseCoordTracker canvas
* Tested successfully in Safari, Opera, Chrome, IE9 and FF 10
*/
function getHexCoordinate3(x,y,scale){
//console.log(x+","+y+","+scale);
//console.log(Viewport);
var yoffset = Math.floor(0.5*Math.sqrt(3)*scale);
var r=0,c=0,subrow=0,subcol=0,subx=0,suby=0,estx=0,esty=0;
var absoluteX = x+Viewport.xmin;
var absoluteY = y+Viewport.ymin;
var positionMask = document.getElementById("mapMouseCoordTracker");
var positionMaskWidth = positionMask.width;
var positionMaskHeight = positionMask.height;
var positionOffsetX = absoluteX % positionMaskWidth;
var positionOffsetY = absoluteY % positionMaskHeight;
var baseX = Math.floor(absoluteX / positionMaskWidth);
var baseY = Math.floor(absoluteY / positionMaskHeight);
var subrow = baseX;
var subcol = baseY;
var subx = positionOffsetX;
var subx = positionOffsetY;
var rootX = baseX*2+1;
var rootY = baseY*2+1;
var ctx = positionMask.getContext("2d");
//ctx.fillStyle = "#000000";
//ctx.fillRect(positionOffsetX,positionOffsetY,1,1);
//console.log(positionOffsetX);
//console.log(positionOffsetY);
var data = ctx.getImageData(positionOffsetX,positionOffsetY,1,1);
var red=data.data[0];
var green=data.data[1];
var blue=data.data[2];
r=rootY;
c=rootX;
if(red==255&&green==0&&blue==0){ //upper left
r=rootY-1;
c=rootX-1;
} else if(red==0&&green==255&&blue==0){ //upper center
r=rootY-1;
} else if(red==0&&green==0&&blue==255){ //upper right
c=rootX+1;
r=rootY-1;
} else if(red==0&&green==255&&blue==255){ //lower right
c=rootX+1;
} else if(red==255&&green==0&&blue==255){ //lower center
r=rootY+1;
} else if(red==255&&green==255&&blue==0){ //lower left
c=rootX-1;
}
//console.log(data);
return {r:r,c:c,subrow:subrow,subcol:subcol,subx:subx,suby:suby,esty:esty,color:"rgba("+red+","+green+","+blue+",255)"};
}
function init(){
var canvasEle = document.getElementById("canvas1");
var ctx = canvasEle.getContext("2d");
ctx.font="14px monospace";
drawMap();
document.getElementById("canvas1").addEventListener("mousemove",function(e){
//console.log(e);
var x=0,y=0;
if(typeof(e.offsetX)=="undefined"||typeof(e.offsetY)=="undefined") { //DAMM YOU FIREFOX
var mozLeft=e.clientX;
var mozTop=e.clientY;
var target=e.target;
mozLeft = mozLeft - target.offsetLeft;
mozTop = mozTop - target.offsetTop;
var parent = target.offsetParent;
while(parent){
mozLeft = mozLeft - parent.offsetLeft;
mozTop = mozTop - parent.offsetTop;
parent = parent.offsetParent;
}
x = mozLeft;
y = mozTop;
}else{
x=e.offsetX;
y=e.offsetY;
}
console.log(x+","+y);
document.getElementById("coordx").innerHTML=x;
document.getElementById("coordy").innerHTML=y;
var mapCoords = getHexCoordinate3(x,y,Viewport.scale);
document.getElementById("coordr").innerHTML=mapCoords.r;
document.getElementById("coordc").innerHTML=mapCoords.c;
document.getElementById("coordsubr").innerHTML=mapCoords.subrow;
document.getElementById("coordsubc").innerHTML=mapCoords.subcol;
document.getElementById("coordsubx").innerHTML=mapCoords.subx;
document.getElementById("coordsuby").innerHTML=mapCoords.suby;
document.getElementById("coordesty").innerHTML=mapCoords.esty;
document.getElementById("coordColor").innerHTML=mapCoords.color;
document.getElementById("hexcoordinate").innerHTML = (mapCoords.c<10?"0":"")+mapCoords.c+(mapCoords.r<10?"0":"")+mapCoords.r;
ctx.lineWidth = 0;
ctx.fillStyle=mapCoords.color;
ctx.fillRect(x,y,1,1);
},false);
document.getElementById("canvas1").addEventListener("click",function(e){
drawMap();
})
}
function onIncreaseScaleButtonClick(){
Viewport.scale+=5;
drawMap();
}
function onDecreaseScaleButtonClick(){
if(Viewport.scale>10){
Viewport.scale-=5;
}
drawMap();
}
/*
* coordinate test validation:
* - overlay position test colors over the entire map.
* This may trigger "slow script" warnings in IE and Firefox.
*/
function drawPositionOverlayMap(){
var canvasEle = document.getElementById("canvas1");
var ctx = canvasEle.getContext("2d");
var width = canvasEle.width;
var height = canvasEle.height;
ctx.lineWidth = 0;
for (var i=0;i<width;i++){
for (var j=0;j<height;j++){
var mapCoords = getHexCoordinate3(i,j,Viewport.scale);
ctx.fillStyle=mapCoords.color;
ctx.fillRect(i,j,1,1);
}
}
ctx.lineWidth = 1;
ctx.strokeStyle = "#000000";
ctx.textColor="#000000";
for (var i=0;i<20;i++){
for (var j=0;j<20;j++){
drawHex(ctx,i,j,Viewport.scale,false,true);
}
}
}
function toggleTracker(){
var ele = document.getElementById("mapMouseCoordTracker");
var style=ele.style.display;
console.log(ele.style);
console.log(ele.style.display);
ele.style.display=(style=="block"?"none":"block");
}
</script>
</head>
<body onload="init()">
<canvas id="canvas1" width="1000px" height="500"></canvas>
<div id="mapToolbar">
<button onclick="onIncreaseScaleButtonClick()">+</button>
<button onclick="onDecreaseScaleButtonClick()">-</button>
</div>
<div class="clear coords">
<span id="hexcoordinate"></span>
(x:<span id="coordx"></span>, y:<span id="coordy"></span>)
(r:<span id="coordr"></span>, c:<span id="coordc"></span>)
(subrow:<span id="coordsubr"></span>, subcol:<span id="coordsubc"></span>)
(subx:<span id="coordsubx"></span>, suby:<span id="coordsuby"></span>)
esty:<span id="coordesty"></span>
mask color: <span id="coordColor"></span>
</div>
<div>
<button onclick="drawPositionOverlayMap()">Draw Position Overlay Map</button>
</div>
<div>
<button onclick="toggleTracker()">Show/Hide Position Tracker</button>
<canvas id="mapMouseCoordTracker"></canvas>
</div>
</body>
</html>