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Fix d3#1437 - add identity projection.
The identity projection is equivalent to setting path.projection(null), except that you can apply post-projection features such as viewport clipping.
1 parent 23ee2c0 commit 8479315

4 files changed

Lines changed: 38 additions & 2 deletions

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‎d3.js‎

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@@ -3932,6 +3932,21 @@ d3 = function() {
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(d3.geo.gnomonic = function() {
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return d3_geo_projection(d3_geo_gnomonic);
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}).raw = d3_geo_gnomonic;
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d3.geo.identity = function() {
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var clipExtent = null;
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function identity(x) {
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return x;
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}
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identity.invert = identity;
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identity.stream = identity;
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identity.clipExtent = function(_) {
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if (!arguments.length) return clipExtent;
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clipExtent = _;
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identity.stream = _ == null ? identity : d3_geo_clipView(_[0][0], _[0][1], _[1][0], _[1][1]);
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return identity;
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};
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return identity;
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};
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function d3_geo_mercator(λ, φ) {
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return [ λ, Math.log(Math.tan(π / 4 + φ / 2)) ];
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}

‎d3.min.js‎

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‎src/geo/identity.js‎

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@@ -0,0 +1,20 @@
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d3.geo.identity = function() {
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var clipExtent = null;
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function identity(x) {
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return x;
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}
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identity.invert = identity;
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identity.stream = identity;
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identity.clipExtent = function(_) {
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if (!arguments.length) return clipExtent;
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clipExtent = _;
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identity.stream = _ == null ? identity : d3_geo_clipView(_[0][0], _[0][1], _[1][0], _[1][1]);
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return identity;
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};
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return identity;
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};

‎src/geo/index.js‎

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@@ -26,6 +26,7 @@ import "conic-equal-area";
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import "conic-equidistant";
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import "equirectangular";
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import "gnomonic";
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import "identity";
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import "mercator";
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import "orthographic";
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import "stereographic";

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