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Google maps JS handle north_direction

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Modifies coords conversion to handle configurable north direction
This commit is contained in:
Ryan Rector
2011-07-10 07:06:20 -06:00
parent f0ea678cb6
commit f306a2ecff
1 changed files with 46 additions and 2 deletions
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48
web_assets/overviewer.js
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@@ -492,6 +492,22 @@ var overviewer = {
var perPixel = 1.0 / (overviewerConfig.CONST.tileSize *
Math.pow(2, overviewerConfig.map.maxZoom));
if(overviewerConfig.map.north_direction == 'lower-left'){
x = x;
y = y;
} else if(overviewerConfig.map.north_direction == 'upper-right'){
x = -x-1;
y = -y-1;
} else if(overviewerConfig.map.north_direction == 'upper-left'){
temp = x;
x = -y-1;
y = temp-16;
} else if(overviewerConfig.map.north_direction == 'lower-right'){
temp = x;
x = y;
y = -temp-1+16;
}
// This information about where the center column is may change with
// a different drawing implementation -- check it again after any
// drawing overhauls!
@@ -500,8 +516,14 @@ var overviewer = {
// so the Y coordinate is at 0.5, and the X is at 0.5 -
// ((tileSize / 2) / (tileSize * 2^maxZoom))
// or equivalently, 0.5 - (1 / 2^(maxZoom + 1))
var lng = 0.5 - (1.0 / Math.pow(2, overviewerConfig.map.maxZoom + 1));
var lat = 0.5;
lng = 0.5 - (1.0 / Math.pow(2, overviewerConfig.map.maxZoom + 1));
lat = 0.5;
if(overviewerConfig.map.north_direction == 'upper-right'){
lng = 0.5 + (1.0 / Math.pow(2, overviewerConfig.map.maxZoom + 1));
} else if(overviewerConfig.map.north_direction == 'upper-left'){
lng = 0.5 + (1.0 / Math.pow(2, overviewerConfig.map.maxZoom + 1));
}
// the following metrics mimic those in ChunkRenderer.chunk_render
// in "chunk.py" or, equivalently, chunk_render in src/iterate.c
@@ -549,6 +571,12 @@ var overviewer = {
lng -= 0.5 - (1.0 / Math.pow(2, overviewerConfig.map.maxZoom + 1));
lat -= 0.5;
if(overviewerConfig.map.north_direction == 'upper-right'){
lng -= 0.5 + (1.0 / Math.pow(2, overviewerConfig.map.maxZoom + 1));
} else if(overviewerConfig.map.north_direction == 'upper-left'){
lng -= 0.5 + (1.0 / Math.pow(2, overviewerConfig.map.maxZoom + 1));
}
// I'll admit, I plugged this into Wolfram Alpha:
// a = (x * 12 * r) + (z * 12 * r), b = (z * 6 * r) - (x * 6 * r)
// And I don't know the math behind solving for for X and Z given
@@ -563,6 +591,22 @@ var overviewer = {
point.x += 64;
point.z -= 64;
if(overviewerConfig.map.north_direction == 'lower-left'){
point.x = point.x;
point.z = point.z;
} else if(overviewerConfig.map.north_direction == 'upper-right'){
point.x = -point.x;
point.z = -point.z;
} else if(overviewerConfig.map.north_direction == 'upper-left'){
temp = point.z;
point.z = -point.x;
point.x = temp+16;
} else if(overviewerConfig.map.north_direction == 'lower-right'){
temp = point.z;
point.z = point.x;
point.x = -temp+16;
}
return point;
},
/**