Home > Tutorials > Html Tutorials

Html5 simulation of flat throwing (simulation of flat throwing)

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Comments: An object is thrown along the horizontal direction at a certain initial velocity. if the object is only subjected to gravity, such a motion is called flat throwing, this article describes how to use html5 to simulate Ball flat throwing. The specific code is as follows. If you are interested, refer to it and hope to help you.

An object is thrown along the horizontal direction at a certain initial velocity. if the object is only subjected to gravity, such a motion is called flat throwing. The flat throwing motion can be seen as the constant linear motion in the horizontal direction and the combination of the vertical freely falling motion. Because of the constant force of an object, the flat motion is a uniformly variable speed curve. The trajectory of the flat object is a parabolic curve. The flat movement is the curve movement. The flat movement time is only related to the vertical height of the throwing point. The horizontal displacement of the object landing is related to the time (vertical height) and the horizontal initial velocity.


The Code is as follows:
<Html>
<Head>
<Meta charset = UTF-8>
<Title> html5 shells </title>
<Script>
// Box
Var box_x = 0;
Var box_y = 0;
Var box_width = 300;
Var box_height = 300;
// Ball
Var ball_x = 10;
Var ball_y = 10;
Var ball_radius = 10;
Var ball_vx = 10;
Var ball_vy = 0;
// Constant
Var g = 10; // note
Var rate = 0.9;
// Bound
Var bound_left = box_x + ball_radius;
Var bound_right = box_x + box_width-ball_radius;
Var bound_top = box_y + ball_radius;
Var bound_bottom = box_y + box_height-ball_radius;
// Context
Var ctx;
Function init ()
{
Ctx = document. getElementById ('canvas '). getContext ('2d ');
Ctx. lineWidth = ball_radius;
Ctx. fillStyle = "rgb (200,0, 50 )";
Move_ball ();
SetInterval (move_ball, 100 );
}
Function move_ball ()
{
Ctx. clearRect (box_x, box_y, box_width, box_height );
Move_and_check ();
Ctx. beginPath ();
Ctx. arc (ball_x, ball_y, ball_radius, 0, Math. PI * 2, true );
Ctx. fill ();
Ctx. strokeRect (box_x, box_y, box_width, box_height );
}
Function move_and_check ()
{
Var cur_ball_x = ball_x + ball_vx;
Var temp = ball_vy;
Ball_vy = ball_vy + g;
Var cur_ball_y = ball_y + ball_vy + g/2;
If (cur_ball_x <bound_left)
{
Cur_ball_x = bound_left;
Ball_vx =-ball_vx* 0.9;
Ball_vy = ball_vy * 0.9;
}
If (cur_ball_x> bound_right)
{
Cur_ball_x = bound_right;
Ball_vx =-ball_vx* 0.9;
Ball_vy = ball_vy * 0.9;
}
If (cur_ball_y <bound_top)
{
Cur_ball_y = bound_top;
Ball_vy =-ball_vy * 0.9;
Ball_vx = ball_vx * 0.9;
}
If (cur_ball_y> bound_bottom)
{
Cur_ball_y = bound_bottom;
Ball_vy =-ball_vy * 0.9;
Ball_vx = ball_vx * 0.9;
}
Ball_x = cur_ball_x;
Ball_y = cur_ball_y;
}
</Script>
</Head>
<Body onLoad = "init ()">
<Canvas id = "canvas" width = "400" height = "400"/>
</Body>
</Html>

Html5 simulates the flat throwing of a ball.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
throwing poi flat launcher flat namespace flat launcher everest simulation softbody simulation gizmo simulation
Related Article
What is the META tag in HTML? Introduction to META Tag proper...
An article that allows you to read basic HTML rules and Web p...
How does HTML set the background color? HTML background color...
HTML5 new label--nav label Introduction
What are the canvases and SVG in HTML5? What is the differenc...
How do I use the HTML5 feature of the Rel property in the?

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.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

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

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

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

    Open a Ticket

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

    Learn More