first commit

web/vue/src/d3/message.js

@@ -0,0 +1,11 @@
+export const draw = function(message) {
+  d3.select("#chart").append("text")
+      .attr('class', 'message')
+      .attr('x', 150)
+      .attr('y', 150)
+      .text(message);
+}
+
+export const clear = function() {
+  d3.select("#chart").find('text').remove();
+}