Can any body tell me how to drag and drop a element in automation testing tool protractor

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AngularJs

I have tried this but its not working

What I have tried:

browser.driver.get("http://dhtmlgoodies.com/submitted-scripts/i-google-like-drag-drop/");

// browser.driver.sleep(10000);
var source=".//*[@id='block-1']/h1";

browser.driver.findElement(By.xpath(source));
var dest= ".//*[@id='block-3']/h1";
browser.driver.findElement(By.xpath(dest));
// browser.actions.dragAndDrop(source,dest).perform();


browser.actions().
mouseDown(source).
mouseMove(dest).
mouseUp().
perform();