Fix #38 - better defaults.

src/projection/albers.js

@@ -2,8 +2,9 @@ import conicEqualArea from "./conicEqualArea";
 
 export default function() {
   return conicEqualArea()
-      .rotate([96, 0])
-      .center([-0.6, 38.7])
       .parallels([29.5, 45.5])
-      .scale(1070);
+      .scale(1070)
+      .translate([480, 250])
+      .rotate([96, 0])
+      .center([-0.6, 38.7]);
 }

src/projection/azimuthalEqualArea.js

@@ -11,5 +11,7 @@ azimuthalEqualArea.invert = azimuthalInvert(function(z) {
 });
 
 export default function() {
-  return projection(azimuthalEqualArea);
+  return projection(azimuthalEqualArea)
+      .scale(120)
+      .clipAngle(180 - 1e-3);
 }

src/projection/azimuthalEquidistant.js

@@ -1,4 +1,4 @@
-import {acos, sin} from "../math";
+import {acos, sin, tau} from "../math";
 import {azimuthal, azimuthalInvert} from "./azimuthal";
 import projection from "./index";
 
@@ -11,5 +11,7 @@ azimuthalEquidistant.invert = azimuthalInvert(function(z) {
 });
 
 export default function() {
-  return projection(azimuthalEquidistant);
+  return projection(azimuthalEquidistant)
+      .scale(480 / tau)
+      .clipAngle(180 - 1e-3);
 }

src/projection/conicEqualArea.js

@@ -21,5 +21,7 @@ function conicEqualArea(y0, y1) {
 }
 
 export default function() {
-  return conicProjection(conicEqualArea);
+  return conicProjection(conicEqualArea)
+      .scale(151)
+      .translate([480, 347]);
 }

src/projection/conicEquidistant.js

@@ -23,5 +23,7 @@ function conicEquidistant(y0, y1) {
 }
 
 export default function() {
-  return conicProjection(conicEquidistant);
+  return conicProjection(conicEquidistant)
+    .scale(128)
+    .translate([480, 280]);
 }

src/projection/gnomonic.js

@@ -10,5 +10,7 @@ function gnomonic(x, y) {
 gnomonic.invert = azimuthalInvert(atan);
 
 export default function() {
-  return projection(gnomonic);
+  return projection(gnomonic)
+      .scale(139)
+      .clipAngle(70);
 }

src/projection/mercator.js

@@ -1,5 +1,5 @@
 import projection from "./index";
-import {atan, exp, halfPi, log, pi, tan} from "../math";
+import {atan, exp, halfPi, log, pi, tan, tau} from "../math";
 
 export function mercator(lambda, phi) {
   return [lambda, log(tan((halfPi + phi) / 2))];
@@ -38,5 +38,5 @@ export function mercatorProjection(project) {
     return m;
   };
 
-  return m.clipExtent(null);
+  return m.clipExtent(null).scale(961 / tau);
 }

src/projection/orthographic.js

@@ -1,4 +1,4 @@
-import {asin, cos, sin} from "../math";
+import {asin, cos, epsilon, sin} from "../math";
 import {azimuthalInvert} from "./azimuthal";
 import projection from "./index";
 
@@ -9,5 +9,7 @@ function orthographic(x, y) {
 orthographic.invert = azimuthalInvert(asin);
 
 export default function() {
-  return projection(orthographic);
+  return projection(orthographic)
+      .scale(240)
+      .clipAngle(90 + epsilon);
 }

src/projection/stereographic.js

@@ -12,5 +12,7 @@ stereographic.invert = azimuthalInvert(function(z) {
 });
 
 export default function() {
-  return projection(stereographic);
+  return projection(stereographic)
+      .scale(240)
+      .clipAngle(180 - 1e-3);
 }