Add setValue getValue functions

spec/api.load-spec.js

@@ -194,4 +194,64 @@ describe('c3 api load', function () {
 
     });
 
+    describe("getValue", function(){
+        it("should get value", function(done){
+            chart.loadColumns([['data1', 100, 200], ['data2', 200, 300]]);
+
+            expect(chart.getValue('data1', 0)).toBe(100);
+            expect(chart.getValue('data1', 1)).toBe(200);
+            expect(chart.getValue('data2', 0)).toBe(200);
+            expect(chart.getValue('data2', 1)).toBe(300);
+
+            done();
+        });
+
+        it("should return undefined when not found", function(done){
+            chart.loadColumns([['data1', 100], ['data2', 200, 300]]);
+
+            expect(chart.getValue('data1', 1)).toBe(undefined);
+            expect(chart.getValue('data2', 2)).toBe(undefined);
+
+            done();
+        });
+    });
+
+    describe("setValue", function(){
+        it("should set value", function(done){
+            chart.loadColumns([['data1', 0, 100, 200], ['data2', 0, -100]]);
+
+            chart.setValue('data1', 0, 200);
+            chart.setValue('data2', 1, 100);
+
+            expect(chart.getValue('data1', 0)).toBe(200);
+            expect(chart.getValue('data2', 1)).toBe(100);
+
+            done();
+        });
+
+        it("should throw when setting to non-existing sequence", function(done){
+            expect(function(){
+                chart.setValue('not presented', 0, 1);
+            }).toThrow();
+
+            done();
+        });
+
+        it("should append value if set to higher point", function(done){
+            chart.loadColumns([['data1', 0]]);
+
+            chart.setValue('data1', 10, 100);
+            chart.setValue('data1', 2, 200);
+
+            var data = chart.getDataById('data1');
+            expect(data.length).toBe(3);
+
+            for(var i = 0; i < 3; i++){
+                expect(data[i].value).toBe(i*100);
+            }
+
+            done();
+        });
+    });
+
 });

src/api.load.js

@@ -91,3 +91,35 @@ c3_chart_fn.loadColumns = function(cols){
     });
 };
 
+c3_chart_fn.setValue = function(id, i, value){
+    var $$ = this.internal;
+    var column = $$.api.getDataById(id);
+
+    if(isUndefined(column)){
+        throw new Error("Setting value to non-existing sequence " + id);
+    }
+
+    if(isUndefined(column[i])){
+        $$.api.appendToColumn([id, value]);
+    } else {
+        column[i] = value;
+        $$.api.loadColumns([[id].concat(column)]);
+    }
+};
+
+c3_chart_fn.getValue = function(id, i){
+    var $$ = this.internal;
+
+    var column = $$.api.getDataById(id);
+    if(isUndefined(column)){
+        return undefined;
+    }
+
+    var v = column[i];
+
+    if(isUndefined(v)){
+        return undefined;
+    }
+
+    return v.value;
+};