subject

In this lab, you will use a timer to animate the movement of a heart image to the location where the mouse clicks, as shown below. The given web page shows a heart image. When the user clicks anywhere in the page, the startAnimation() function is called. startAnimation() determines where the user clicked and calls moveImage() with the clicked (x, y) coordinate. moveImage() moves the heart 1 pixel in the direction of the given (x, y) coordinates.
Make the following JavaScript modifications using clearInterval() and setInterval() where appropriate:
In startAnimation(), add an if statement that stops the timer with the ID timerId if timerId is not null.
In startAnimation(), start a timer that calls moveImage(clickX, clickY) every 10 milliseconds. Save the timer ID in the timerId variable.
Add an if statement in moveImage() that stops the timer with the ID timerId if (imgX, imgY) is equal to (centerX, centerY). Also set timerId to null.
After the modifications are complete, the user should be able to click anywhere in the browser, and the heart will move to the clicked location.

ansver
Answers: 3

Other questions on the subject: Computers and Technology

image
Computers and Technology, 21.06.2019 15:00, cia196785920
Look at the circuit illustrated in the figure above. assume that the values of r1 and r2 are equal. if you connect your meter’s test probes to points a and b in the circuit, which of the following voltages would you measure
Answers: 1
image
Computers and Technology, 22.06.2019 18:40, penelopymorales24
Mariah was working on a multimedia presentation that included both video and audio files. the file was huge, and she wanted to send it to her coworker in another office. she needed to reduce the size of the file so that it could be transmitted faster. the utility she used to do this was
Answers: 2
image
Computers and Technology, 22.06.2019 19:00, alyssashae1818
Which parts of a presentation should be the most general? a. introduction and conclusion b. introduction and outline c. outline and conclusion d. outline and body
Answers: 1
image
Computers and Technology, 23.06.2019 18:30, DSUDLER5555
Write a program that prints the day number of the year, given the date in the form month-day-year. for example, if the input is 1-1-2006, the day number is 1; if the input is 12-25-2006, the day number is 359. the program should check for a leap year. a year is a leap year if it is divisible by 4, but not divisible by 100. for example, 1992 and 2008 are divisible by 4, but not by 100. a year that is divisible by 100 is a leap year if it is also divisible by 400. for example, 1600 and 2000 are divisible by 400. however, 1800 is not a leap year because 1800 is not divisible by 400.
Answers: 3
You know the right answer?
In this lab, you will use a timer to animate the movement of a heart image to the location where the...

Questions in other subjects:

Konu
Mathematics, 17.12.2020 05:40