1 files changed, 108 insertions, 0 deletions
diff --git a/src/sp-metrics.cpp b/src/sp-metrics.cpp
new file mode 100644
index 000000000..27d65422f
--- /dev/null
+++ b/src/sp-metrics.cpp
@@ -0,0 +1,108 @@
+#include "sp-metrics.h"
+#include "unit-constants.h"
+
+/*
+ * SPMetric handling and stuff
+ * I hope this will be usefull :-) 
+ */
+
+gdouble
+sp_absolute_metric_to_metric (gdouble length_src, const SPMetric metric_src, const SPMetric metric_dst)
+{
+  gdouble src = 1;
+  gdouble dst = 1;
+
+  switch (metric_src) {
+  case SP_M:
+    src = M_PER_IN;
+    break;
+  case SP_MM:
+    src = MM_PER_IN;
+    break;
+  case SP_CM:
+    src = CM_PER_IN;
+    break;
+  case SP_IN:
+    src = IN_PER_IN;
+    break;
+  case SP_PT:
+    src = PT_PER_IN;
+    break;
+  case SP_PX:
+    src = PX_PER_IN;
+    break;
+  case NONE:
+    src = 1;
+    break;
+  }
+
+  switch (metric_dst) {
+  case SP_M:
+    dst = M_PER_IN;
+    break;
+  case SP_MM:
+    dst = MM_PER_IN;
+    break;
+  case SP_CM:
+    dst = CM_PER_IN;
+    break;
+  case SP_IN:
+    dst = IN_PER_IN;
+    break;
+  case SP_PT:
+    dst = PT_PER_IN;
+    break;
+  case SP_PX:
+    dst = PX_PER_IN;
+    break;
+  case NONE:
+    dst = 1;
+    break;
+  }
+
+  return length_src * (dst/src);
+}
+
+/**
+ * Create a human-readable string suitable for status-bar display.
+ */
+GString *
+sp_metric_to_metric_string(gdouble const length,
+                           SPMetric const metric_src, SPMetric const metric_dst,
+                           gboolean const m)
+{
+    gdouble const len = sp_absolute_metric_to_metric(length, metric_src, metric_dst);
+    GString *str = g_string_new("");
+    g_string_printf(str, "%0.02f", len); 
+    /* We need a fixed number of fractional digits, because otherwise the live statusbar display of
+     * lengths will be too jerky */
+
+    if (m) {
+        char const *unit_str;
+        switch (metric_dst) {
+            case SP_M:  unit_str = " m"; break;
+            case SP_MM: unit_str = " mm"; break;
+            case SP_CM: unit_str = " cm"; break;
+            case SP_IN: unit_str = "\""; break;
+            case SP_PT: unit_str = " pt"; break;
+            case SP_PX: unit_str = " px"; break;
+            default: unit_str = NULL; break;
+        }
+        if (unit_str) {
+            g_string_append(str, unit_str);
+        }
+    }
+    return str;
+}
+
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :