1 files changed, 42 insertions, 0 deletions
diff --git a/piano/pianoui.c b/piano/pianoui.c
new file mode 100644
index 0000000..10da0b7
--- /dev/null
+++ b/piano/pianoui.c
@@ -0,0 +1,42 @@
+enum TUNE{
+    LOW=0, MEDIUM=(1<<3), HIGH=(2<<3)
+};
+
+int transkey(unsigned int index)
+{
+    int note, tune;
+
+    note = index%7;
+    index /= 7;
+    switch(index){
+    case 0:
+        tune = HIGH;
+        break;
+    case 1:
+        tune = MEDIUM;
+        break;
+    case 2:
+        tune = LOW;
+        break;
+    default:
+        return -1;
+    }
+    return note|tune;
+}
+
+int get_showcode(unsigned int note, int raise)
+{
+    int idx;
+    if (note<=2){
+        idx = note*2;
+    }
+    else{
+        idx = note*2-1;
+    }
+    idx += raise;
+    if (idx>=12){
+        idx -= 12;
+    }
+    return idx+'a';
+}
+