Add a few tests for d3.scale.linear.

Makefile

@@ -137,7 +137,8 @@ tests: \
 	tests/test-append.test \
 	tests/test-attr.test \
 	tests/test-format.test \
-	tests/test-transition.test
+	tests/test-transition.test \
+	tests/test-scale-linear.test
 
 %.min.js: %.js Makefile
 	@rm -f $@

tests/test-scale-linear.js

@@ -0,0 +1,52 @@
+require("./../lib/env-js/envjs/node");
+require("./../lib/sizzle/sizzle");
+require("./../d3");
+require("./../d3.time");
+
+var f = d3.format(" .3f");
+
+var x = d3.scale.linear();
+console.log("domain([0, 1]).range([0, 1]):");
+console.log("         -0.5  -> ", f(x(-0.5)));
+console.log("          0.0  -> ", f(x(0.0)));
+console.log("          0.5  -> ", f(x(0.5)));
+console.log("          1.0  -> ", f(x(1.0)));
+console.log("          1.5  -> ", f(x(1.5)));
+console.log("");
+
+var x = d3.scale.linear().domain([1, 2]);
+console.log("domain([1, 2]).range([0, 1]):");
+console.log("          0.5  -> ", f(x(0.5)));
+console.log("          1.0  -> ", f(x(1.0)));
+console.log("          1.5  -> ", f(x(1.5)));
+console.log("          2.0  -> ", f(x(2.0)));
+console.log("          2.5  -> ", f(x(2.5)));
+console.log("");
+
+var x = d3.scale.linear().domain([new Date(1990, 0, 1), new Date(1991, 0, 1)]);
+console.log("domain([01/01/1990, 01/01/1991]).range([0, 1]):");
+console.log("   10/20/1989  -> ", f(x(new Date(1989, 09, 20))));
+console.log("   01/01/1990  -> ", f(x(new Date(1990, 00, 01))));
+console.log("   03/15/1990  -> ", f(x(new Date(1990, 02, 15))));
+console.log("   05/27/1990  -> ", f(x(new Date(1990, 04, 27))));
+console.log("   01/01/1991  -> ", f(x(new Date(1991, 00, 01))));
+console.log("   03/15/1991  -> ", f(x(new Date(1991, 02, 15))));
+console.log("");
+
+var x = d3.scale.linear().range(["red", "blue"]);
+console.log("domain([0, 1]).range([\"red\", \"blue\"]):");
+console.log("         -0.5  -> ", x(-0.5));
+console.log("          0.0  -> ", x(0.0));
+console.log("          0.5  -> ", x(0.5));
+console.log("          1.0  -> ", x(1.0));
+console.log("          1.5  -> ", x(1.5));
+console.log("");
+
+var x = d3.scale.linear().range(["red", "blue"]).interpolate(d3.interpolateHsl);
+console.log("domain([0, 1]).range([\"red\", \"blue\"]).interpolate(hsl):");
+console.log("         -0.5  -> ", x(-0.5));
+console.log("          0.0  -> ", x(0.0));
+console.log("          0.5  -> ", x(0.5));
+console.log("          1.0  -> ", x(1.0));
+console.log("          1.5  -> ", x(1.5));
+console.log("");

tests/test-scale-linear.out

@@ -0,0 +1,36 @@
+domain([0, 1]).range([0, 1]):
+         -0.5  ->  −0.500
+          0.0  ->   0.000
+          0.5  ->   0.500
+          1.0  ->   1.000
+          1.5  ->   1.500
+
+domain([1, 2]).range([0, 1]):
+          0.5  ->  −0.500
+          1.0  ->   0.000
+          1.5  ->   0.500
+          2.0  ->   1.000
+          2.5  ->   1.500
+
+domain([01/01/1990, 01/01/1991]).range([0, 1]):
+   10/20/1989  ->  −0.200
+   01/01/1990  ->   0.000
+   03/15/1990  ->   0.200
+   05/27/1990  ->   0.400
+   01/01/1991  ->   1.000
+   03/15/1991  ->   1.200
+
+domain([0, 1]).range(["red", "blue"]):
+         -0.5  ->  rgb(383,0,-127)
+          0.0  ->  rgb(255,0,0)
+          0.5  ->  rgb(128,0,128)
+          1.0  ->  rgb(0,0,255)
+          1.5  ->  rgb(-127,0,383)
+
+domain([0, 1]).range(["red", "blue"]).interpolate(hsl):
+         -0.5  ->  #0000ff
+          0.0  ->  #ff0000
+          0.5  ->  #00ff00
+          1.0  ->  #0000ff
+          1.5  ->  #ff0000
+