Added SVG.Number, reworked gradient system

1 files changed, 75 insertions, 0 deletions

diff --git a/src/number.js b/src/number.js
new file mode 100644
index 0000000..28e260e
--- /dev/null
+++ b/src/number.js
@@ -0,0 +1,75 @@
+// Module for unit convertions
+SVG.Number = function(value) {
+
+  /* initialize defaults */
+  this.value = 0
+  this.unit = ''
+
+  /* parse value */
+  switch(typeof value) {
+    case 'number':
+      this.value = value
+    break
+    case 'string':
+      var match = value.match(SVG.regex.unit)
+
+      /* make valu numeric */
+      this.value = parseFloat(match[1])
+  
+      /* normalize percent value */
+      if (match[2] == '%')
+        this.value /= 100
+  
+      /* store unit */
+      this.unit = match[2]
+
+    break
+    default:
+      if (value instanceof SVG.Number) {
+        this.value = value.value
+        this.unit  = value.unit
+      }
+    break
+  }
+}
+
+SVG.extend(SVG.Number, {
+  // Stringalize
+  toString: function() {
+    return (this.unit == '%' ? ~~(this.value * 100) : this.value) + this.unit
+  }
+, // Convert to primitive
+  valueOf: function() {
+    return this.value
+  }
+  // Convert to different unit
+, to: function(unit) {
+    if (typeof unit === 'string')
+      this.unit = unit
+
+    return this
+  }
+  // Add number
+, plus: function(number) {
+    this.value = this + new SVG.Number(number)
+
+    return this
+  }
+  // Subtract number
+, minus: function(number) {
+    return this.plus(-new SVG.Number(number))
+  }
+  // Multiply number
+, times: function(number) {
+    this.value = this * new SVG.Number(number)
+
+    return this
+  }
+  // Divide number
+, divide: function(number) {
+    this.value = this / new SVG.Number(number)
+
+    return this
+  }
+
+})
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