Flash Basic Theory Course 14th Chapter Inverse kinematics: Dragging and stretching Ⅱ

Source: Internet
Author: User
Tags addchild

Back to "flash Basic Theory Class-Catalog"

Catch an Object

The next example is to reuse the Ball class and add it to our engineering or classpath. Then create some new variables for the ball to move. Note that this code is based on the last example and we just need to join:

private var ball:Ball;
private var gravity:Number = 0.5;
private var bounce:Number = -0.9;

In the Init method, create an instance of ball and add the display list.

private function init():void {
 ball = new Ball();
 ball.vx = 10;
 segments = new Array();
 for (var i:uint = 0; i < numSegments; i++) {
  var segment:Segment = new Segment(50, 10);
 segment.x = stage.stageWidth / 2;
 segment.y = stage.stageHeight;
 addEventListener(Event.ENTER_FRAME, onEnterFrame);

Call a function called Moveball in Onenterframe, just separate the motion code of all the balls, in order to look like it's not confusing:

private function onEnterFrame(event:Event):void {
 var target:Point = reach(segments[0], mouseX, mouseY);
 for (var i:uint = 1; i < numSegments; i++) {
  var segment:Segment = segments[i];
  target = reach(segment, target.x, target.y);
 for (i = numSegments - 1; i > 0; i--) {
  var segmentA:Segment = segments[i];
  var segmentB:Segment = segments[i - 1];
  position(segmentB, segmentA);

That's the function:

private function moveBall():void {
 ball.vy += gravity;
 ball.x += ball.vx;
 ball.y += ball.vy;
 if (ball.x + ball.radius > stage.stageWidth) {
  ball.x = stage.stageWidth - ball.radius;
  ball.vx *= bounce;
 } else if (ball.x - ball.radius < 0) {
  ball.x = ball.radius;
  ball.vx *= bounce;
 if (ball.y + ball.radius > stage.stageHeight) {
  ball.y = stage.stageHeight - ball.radius;
  ball.vy *= bounce;
 } else if (ball.y - ball.radius < 0) {
  ball.y = ball.radius;
  ball.vy *= bounce;

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.