How do I calculate the arc of a projectile in javascript?
I am creating a game for coursework, two tanks placed on a canvas with input boxes for the initial velocity and angle of the turret, then a button to fire a projectile (currently a div element in the shape of a circle), which calls a function in this case it is fire1. I have messed around for a few days and can't seem to get it to work, "bullet" is my div element.
function fire1 () {
var canvas = document.getElementById("canvas")
var bullet = document.getElementById("bullet");
bullet.style.visibility = "visible"
var start = null;
var intialVelocity = velocity1.value
var angle = angle1.value
var g = 9.81;
var progress, x, y;
function step(timestamp) {
if(start === null) start = timestamp;
progress = (timestamp - start)/1000;
x = (turret1.x + 80) + (intialVelocity*progress)
y = (turret1.y - 400) + (intialVelocity*progress)*Math.sin(angle*toRadians) - (0.5*g*(progress^2));//)
bullet.style.left = x + "px";
bullet.style.bottom = y + "px";
requestAnimationFrame(step);
}
requestAnimationFrame(step);
}
Below is my css bit of my bullet.
#bullet {
position: absolute;
left: 0;
bottom: 50%;
width: 1em;
height: 1em;
border-radius: 0.5em;
background: red;
visibility: hidden;
}
I am very new to javascript, css and html so help would be very appriciated, I'm trying to incorporate the trajectory formula will this work? I also want it to be animated so it follows a path when fired. Thanks
javascript html css jquery-animate
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
add a comment |
I am creating a game for coursework, two tanks placed on a canvas with input boxes for the initial velocity and angle of the turret, then a button to fire a projectile (currently a div element in the shape of a circle), which calls a function in this case it is fire1. I have messed around for a few days and can't seem to get it to work, "bullet" is my div element.
function fire1 () {
var canvas = document.getElementById("canvas")
var bullet = document.getElementById("bullet");
bullet.style.visibility = "visible"
var start = null;
var intialVelocity = velocity1.value
var angle = angle1.value
var g = 9.81;
var progress, x, y;
function step(timestamp) {
if(start === null) start = timestamp;
progress = (timestamp - start)/1000;
x = (turret1.x + 80) + (intialVelocity*progress)
y = (turret1.y - 400) + (intialVelocity*progress)*Math.sin(angle*toRadians) - (0.5*g*(progress^2));//)
bullet.style.left = x + "px";
bullet.style.bottom = y + "px";
requestAnimationFrame(step);
}
requestAnimationFrame(step);
}
Below is my css bit of my bullet.
#bullet {
position: absolute;
left: 0;
bottom: 50%;
width: 1em;
height: 1em;
border-radius: 0.5em;
background: red;
visibility: hidden;
}
I am very new to javascript, css and html so help would be very appriciated, I'm trying to incorporate the trajectory formula will this work? I also want it to be animated so it follows a path when fired. Thanks
javascript html css jquery-animate
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
add a comment |
I am creating a game for coursework, two tanks placed on a canvas with input boxes for the initial velocity and angle of the turret, then a button to fire a projectile (currently a div element in the shape of a circle), which calls a function in this case it is fire1. I have messed around for a few days and can't seem to get it to work, "bullet" is my div element.
function fire1 () {
var canvas = document.getElementById("canvas")
var bullet = document.getElementById("bullet");
bullet.style.visibility = "visible"
var start = null;
var intialVelocity = velocity1.value
var angle = angle1.value
var g = 9.81;
var progress, x, y;
function step(timestamp) {
if(start === null) start = timestamp;
progress = (timestamp - start)/1000;
x = (turret1.x + 80) + (intialVelocity*progress)
y = (turret1.y - 400) + (intialVelocity*progress)*Math.sin(angle*toRadians) - (0.5*g*(progress^2));//)
bullet.style.left = x + "px";
bullet.style.bottom = y + "px";
requestAnimationFrame(step);
}
requestAnimationFrame(step);
}
Below is my css bit of my bullet.
#bullet {
position: absolute;
left: 0;
bottom: 50%;
width: 1em;
height: 1em;
border-radius: 0.5em;
background: red;
visibility: hidden;
}
I am very new to javascript, css and html so help would be very appriciated, I'm trying to incorporate the trajectory formula will this work? I also want it to be animated so it follows a path when fired. Thanks
javascript html css jquery-animate
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
I am creating a game for coursework, two tanks placed on a canvas with input boxes for the initial velocity and angle of the turret, then a button to fire a projectile (currently a div element in the shape of a circle), which calls a function in this case it is fire1. I have messed around for a few days and can't seem to get it to work, "bullet" is my div element.
function fire1 () {
var canvas = document.getElementById("canvas")
var bullet = document.getElementById("bullet");
bullet.style.visibility = "visible"
var start = null;
var intialVelocity = velocity1.value
var angle = angle1.value
var g = 9.81;
var progress, x, y;
function step(timestamp) {
if(start === null) start = timestamp;
progress = (timestamp - start)/1000;
x = (turret1.x + 80) + (intialVelocity*progress)
y = (turret1.y - 400) + (intialVelocity*progress)*Math.sin(angle*toRadians) - (0.5*g*(progress^2));//)
bullet.style.left = x + "px";
bullet.style.bottom = y + "px";
requestAnimationFrame(step);
}
requestAnimationFrame(step);
}
Below is my css bit of my bullet.
#bullet {
position: absolute;
left: 0;
bottom: 50%;
width: 1em;
height: 1em;
border-radius: 0.5em;
background: red;
visibility: hidden;
}
I am very new to javascript, css and html so help would be very appriciated, I'm trying to incorporate the trajectory formula will this work? I also want it to be animated so it follows a path when fired. Thanks
javascript html css jquery-animate
javascript html css jquery-animate
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
asked Nov 14 '18 at 18:52
Ollie FoxOllie Fox
62
62
add a comment |
add a comment |
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