执行流程图无法完全展示(Callgraph not full show)

执行流程图无法完全展示(Callgraph not full show)
```
var el = d3.select(container),
width = parseInt(el.style('width'), 10),
height = 1000;

var svg = d3.select(container).append('svg')
.attr('class', 'callgraph')
.attr('width', width)
.attr('height', height);
```

height is fixed value and dynamic width value is not correct
