Thanks for this infomation about using sprite object to replace box object to make a boundary.

Another question, where to use box object?

In your cap, when black sprite idle(no keyboard pressed), it

had not been push when ball sprite hit it. It looks like a wall to block the ball. How to do that?

In my cap, the black sprite will be push back until ouside the window. I see the position x of black sprite is less then 0 in debug mode.

If black sprite will not move whe ball hit it, it will not been push ouside the window. That is a good solution.

1, You could still use the box objects for the walls and floor, but you need to fill it with a colour (untick its 'use' transparent attribute for the fill colour)

2, To stop the black sprite moving when the ball collides : Give the black sprite a 'solid' attribute (tick the box that makes it solid)

Has this problem been solved?

I find a similar problem between a plateform behavior sprite with a rectangle shape and a ball behavior sprite with a circle shape.

The circle (ball behavior) sprite will kick another outside the screen.

here is my test case:

http://dl.dropbox.com/u/5779181/collision_problem.zip

Wait a moment, you will see the black sprite gone.

(environment: construct 0.99.97 in winXP)

I had a quick look at your cap, and noticed that your 'walls' are made out of box objects with a 'transparent' fill ? Thats why the player and wall collision isnt working. The box object's outline is not thick enough(pixels) for it to register a collision.

Here's the cap file with the walls made out of a normal solid sprite.

http://dl.dropbox.com/u/22173473/colisionprob2.cap

The black sprite now has something to stop it leaving the screen.

Hope this helps.

I'm not at home testing this, just looking at the screeshot, but I notice, your many apps have a ui with lots of text and buttons and sliders always. I understand how this can be done with objects and events, but its a tedious process. Are you using a particular plugin or technique that's cutting out some of the tedium, or are you just more patient than me?

Hi Lucid

i know what you mean when you say 'tedious' !

In this project the U.I is basically 'box objects' and a couple of 'sprite buttons', with text objects on top of them. As long as the 'snap to grid' option enabled (on a very low setting ) it is suprisingly easy to create.

Dont get me wrong though, i have about 40 different 'back-up' versions each using different and various combos of sprite buttons, edit boxes, list object...Etc, and its took me about a week to to get to this stage.

Couple of tutorials about game physics, collisions, elasticity, gravity etc.

http://dl.dropbox.com/u/22173473/Collisions.rar

Might be usefull ?

Simple tool for Particle testing. The next version will allow for 'import and 'Saving' for the various settings.(or a print out)

<img src="http://dl.dropbox.com/u/22173473/psplash.png">

Old version

http://dl.dropbox.com/u/22173473/Particlebasic.rar

Note, the values in red cannot be changed yet.

prawnsushi

"But now i have to ask this question : is it possible to add an animation frame at runtime?"

You could have a look at the events in this app i made (sprite sheet splitter). I had to find an easy way to import images and add them to a sprites frames at runtime.

http://dl.dropbox.com/u/22173473/Sprite%20splitter.rar

contains cap file and images.

Hope this helps.

(monsharen)

So thats how you do it!i was only getting a ball that constantly bounced around the screen. i will have a look at your capx. cheers.

(Tom)

I'm doing doing the old 'crash course in jscript' and it doesn't include descriptions for a lot of the equations, so thanks for your help.

Thanks to everybody for your help.

I managed to find a good tutorial on Object collisions for games and apps and i will checkout the Js websites you have mentioned.

Heres a link to the files and tutorials if anybody is interested -

http://dl.dropbox.com/u/22173473/Collisions.rar

Only (150k) containing - 2 Game physics tutorials (gravity a elasticity)

The Html/jscript file i that i mention in the post.

You can test your Browsers canvas rendering speed here -

http://labs.skookum.com/demos/canvastest/

The website includes various tips and guides regarding browser and canvas speed problems.

http://skookum.com/

I downloaded a couple of Javascript tutorials about 'Baasic physics', and i'm stuck on page 1.

Note. I have done a bit more research and think i understand most of it, but i can't work out what the symbols marked in red mean?

// Version 3 - Basic collision (viewbox), perfectly elastic (no energy loss)

var ball = {

x: 300,

y: 200,

r: 15,

vx: 0,

vy: 0

}

// Update ball (with Physics! =)

// 1 - apply velocity to position (vx -> x)

ball.x += ball.vx;

ball.y += ball.vy;

// 2 - apply drag/friction to velocity

ball.vx *= .99;

ball.vy *= .99;

// 3 - apply gravity to velocity

ball.vy += .25;

// 4 - check for collisions

if (ball.y + ball.r > canvas.height) {

ball.y = canvas.height - ball.r;

ball.vy = -Math.abs(ball.vy);

}

// Draw ball

ctx.save();

ctx.translate(ball.x, ball.y);

ctx.fillStyle = "#fff";

ctx.beginPath();

ctx.arc(0, 0, ball.r, 0, Math.PI * 2, true);

ctx.closePath();

ctx.fill();

ctx.restore();

}, 1000 / 77);

please could somebody have a look at the above and post a quick line breakdown.

thanks in advance.

What graphics editor are you using?

The cap crashed because it could not locate the sounds?

Looking at the events on layout 3, you have opted to include 'event sheet main' which contains-

(main event sheet)

+ Sprite: is jumping

-> Sprite2: Set animation to "jump"

I think this is were the animation gets messed up ( i couldn't run it to check )

Maybe you could add another condition to the above, that only triggers the jump animation if the player is not carrying the gun?

+ Sprite: is jumping

Sprite2 value 'gun' = 0 )or whatever variable your using)

-> Sprite2: Set animation to "jump"

Hope this helps.