WebDriver driver = new FirefoxDriver();
driver.get("http://www.theautomatedtester.co.uk/demo1.html");
Actions builder= new Actions(driver);
WebElement canvas = driver.findElement(By.id("tutorial"));
builder.build();
builder.moveToElement(canvas, 100, 100)
.clickAndHold()
.moveByOffset(40, 60)
.release();
builder.perform();