ActionScript: fruit ninja swipe - actionscript-3

I'm trying to build the fruit ninja type swipe to some of my buttons in Flash CS6 and ActionScript3.
In trying to figure it out this is what I have come up with:
get the coordinates of where the user first put his finger mouse down,
then where we lifted it
see if your button touches any of those coordinates (if yes, execute that button code)
run some kind of animation between the first two coordinates (mouse down, mouse up points)
am I on the right track?
Also, has anyone already done this so that I can look at their code?
Thanks!

Check out this series on the subject by the great Emanuele Feronato, using the physics library Box2d:
Slicing, splitting and cutting objects with box2d
Part 2: Actually split the object
Part 4: Using real graphics
(I couldn't find part 3 but I don't think we're missing anything too important there). Hope this helps!

Related

User interface flash AS 3.0

since the Site seems to be pretty buggy i have to post my question below. Sorry for the inconvenience.
Hi guys
I'm new to flash and i want to create a GUI for my little game.
How can i create a start window where I can select stuff like how many objects to spawn or move speed of my character.
My first idea was to hide everything else on the stage until I click start.
Would that be right. Is the a better way. how to do this anyway.
And where do i put my GUI script. Stage or extern class.
Place your start button in the first frame and put your other elements in second frame. On click of the start button gotoAndPlay to next frame.

How do I create a simple on-mouse-click rotating object in flash

This question may get downvoted or go unanswered because it's not the greatest and incredible silly but anyway,
I'm taking an intro level Webanimation course this semester at UNI and had I know what their expectations are for our hand-in projects i would have never taken it up.
Basically the teacher taught us stuff to the extent of masking/tweening and very few mouse-event and basic function codes.
Now she is expecting us to make a god damn ENTIRE PIPE GAME. The one where there are a bunch of rotating pipes and you gotta rotate them in place before a timer runs out and then the water flows through them.
For this project I have to somehow figure out the following (even though she didn't teach any of this):
-creature a grid of rotate-able pipes (one mouse click I assume would do a 90 degree classic tween rotation of the object)
-creature some sort of logic hit-box value chain to make pipes decide when to fill with water (they fill with water (a.k.a turn blue inside as an animation) once they are connected to another water filled pipe, for example)
-creature multiple levels and a menu screen
-add a music track.
Now i know this site is for specific help only and you basically can't ask for help on an entire project, so for now if somebody could just help me out with the following:
How do I create a rotating pipe on mouseclick?
So I have my pipe movieclip created and I have my Mouse Event code ready but I don't have the faintest on how to make a tween within the pipe and connect it to the code so that it rotates on mouseclick.
So this far, let's say for one of the pipes, instance pipe_1, I want to do this:
pipe_1.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler);
function fl_MouseClickHandler(event:MouseEvent):void
{
trace("Mouse clicked");
}
I also have the simple tween of rotation already created within the instance of the pipe, but dunno how to connect it to code.
I'm supposed to figure out what to put inside the function but I honestly have no clue. Hours of googling have come up with nothing either except a 12 dollar purchasable source code for an even more complicated pipe game.
I hope somebody can at least help a bit, and thanks.
The way to rotate a clip is via it's rotation property. It defaults to 0.
If you were set the rotation property of your tile to 90, you'd rotate your pipe tile 90 degrees.
for example :
pipe_1.rotation += 90;
A tween is a means of changing a property of a given DisplayObject over time. So what you want to do is tween your rotation property 90 degrees over time.
Here is a tutorial on Tweening - http://www.republicofcode.com/tutorials/flash/as3tweenclass/
I think it'd be more beneficial for you to take the time to learn about it, than to have me just write a few lines of code to solve your problem.
StackOverflow is a place where you can ask a question, AFTER you have tried something and have hit an issue.
I have provided you with the basic concept of what you need to do, and if you take the time to learn about tweening, you'll be able to achieve your goal rather simply.
There are also tweening libraries such as TweenLite and TweenMax that simplify tweening. Not sure if your class will allow you to use them, but worthwhile to check out for your own benefit.
You can find TweenLite here :
http://www.greensock.com/tweenlite/
Are you talking about a frame by frame tween? or tweening with code?
for frame by frame tweening, you can try to do this:
pipe_1.addEventListener(MouseEvent.CLICK, f1_MouseClickHandler);
function f1_MouseClickHandler(e:MouseEvent) {
pipe_1.gotoAndPlay(2); //if the tween starts at frame 2
}
For code tweening, just call the tween function inside that handler function

How can I select and drag a line in canvas?

I'm now working on a painting app. It uses a html canvas. Users can draw shapes on the canvas.
Now a problem comes to me. I want to select the line that I drew on the canvas. When it is selected, I can drag it or delete it. How can I implement it ? Any good ideas?
It might be worth your while to have a look at https://github.com/canvimation/canvimation.github.com this contains the source code for a drawing application using canvas.
You should note that this application is being re-coded but there is not yet a working version using the new code on line. The new source code is in the stage1 branch. Hopefully this new code is easier to understand than the old code and the code referred to below comes from the stage1 branch.
Basically a shape object is created for each shape drawn which includes all data about eh shape, including path data and data giving the rectangular boundary around the shape. When the "boundarydrop" div is clicked then function checkBoundary is called and data about the shift key and cursor position are passed. Then for each shape the first check is to see if the cursor is within the boundary of the shape and if so then a more refined check is carried out. For a closed shape the check is if the cursor in inside the shape and for an open shape if the cursor is close to the path.
There are further complications depending whether the shift key is held down or not and which group the shape belongs to. However the basics are there.
Functions to check out
in index.html
shiftdown
getPosition
in scripts/drawboundary.js
checkBoundary
isIn
isOn
in scripts/shape.js
shape
A working online version of the application is at http://canvimation.github.com/ but this uses the older code in the master branch and there are some bugs but it will give you some idea of what the application does.
Hope this is of some help
There is a library called kinetic.js, with it you can keep track of the shapes you draw on the canvas with the select feature.
Here is the link: https://github.com/ericdrowell/KineticJS

Box2D/AS3 Dynamic Platform only bounces Other Dynamic Objects

I have a dynamic platform which is moved by the keyboard. Think brick breaker games.
I want it to reflect other dynamic objects that hit it, but I don't want it to get knocked all over the place.
How do I do that?
Appreciate the help. Thanks.
You can make the platform a kinematic body. Set the type to b2_kinematicBody in the body definition before you create it, or do body->SetType(b2_kinematicBody) after you create it.
Kinematic bodies do not respond to forces or impulses, so you will need to use SetLinearVelocity to move it. They also do not collide with static bodies so if you have static-body walls at the side of your playing area, the platform will be able to move right through them - you'll have to check the position each time step to see if the platform should stop.

Drag objects in canvas

Im looking for an easy to use method of assigning drag behavior to multiple objects (images, shapes etc) in canvas. Does anyone have a good way or know of any libraries for dragging objects around? Thanks
Creating your own mouse events takes a little work - ideally you should either create or use some kind of mini-library. I'm thinking of creating something like this in the near future. Anyway, I created a drag and drop demo on jsFiddle showing how to drag images - you can view it here.
You can create draggable images like this:
var myImage = new DragImage(sourcePath, x, y);
Let me know if you have any questions about this. Hope it helps.
EDIT
There was a bug when dragging multiple images. Here is a new version.
Another thing you might want to check out is easeljs it sort of in the style of AS3... mouseEvents dragging etc...
The HTML Canvas—unlike SVG or HTML—uses a non-retained (or immediate) graphics API. This means that when you draw something (like an image) to the canvas no knowledge of that thing remains. The only thing left is pixels on the canvas, blended with all the previous pixels. You can't really drag a subset of pixels; for one thing, the pixels that were 'under' them are gone. What you would have to do is:
Track the mousedown event and see if it's in the 'right' location for dragging. (You'll have to keep track of what images/objects are where and perform mouse hit detection.)
As the user drags the mouse, redraw the entire canvas from scratch, drawing the image in a new location each time based on the offset between the current mouse location and the initial mousedown location.
Some alternatives that I might suggest:
SVG
Pure HTML
Multiple layered canvases, and drag one transparent canvas over another.
The HTML Canvas is good for a lot of things. User interaction with "elements" that appear to be distinct (but are not) is not one of those things.
Update: Here are some examples showing dragging on the canvas:
http://developer.yahoo.com/yui/examples/dragdrop/dd-region.html
http://www.redsquirrel.com/dave/work/interactivecanvas/
http://langexplr.blogspot.com/2008/11/using-canvas-html-element.html
None of these have created a separate library for tracking your shapes for you, however.
KineticJS is one such Javascript Library that u can use exclusively for animations
Heres the Link html5canvastutorials
Canvas and jCanvas
You're definitely gonna want to check out jCanvas. It's a super clean wrapper for Canvas, which kicks open a lot of doors without adding code complexity. It makes things like this a breeze.
For example, here's a little sandbox of something close to what you're after, with dragging and redrawing built right in:
Drawing an Arrow Between Two Elements.
I ventured down the road of doing everything with DIVs and jQuery but it always fell short on interactivity and quality.
Hope that helps others, like me.
JP
As you create new objects whether they are windows, cards, shapes or images to be draggable, you can store them in an array of "objects currently not selected". When you click on them or select them or start dragging them you can remove them from the array of "objects not selected". This way you can control what can move in the event of a particular mousedown event or mousemove event by checking if it isn't selected. If it is selected it will not be in the "not selected" array and you can move the mouse pointer over other shapes while dragging shapes without them becoming dragged.
Creating arrays of objects you would like to drag also helps with hierarchy. Canvas draws the pixels belonging to the foremost object last. So if the objects are in an array you simply switch their instance as in element in the array say from objectArray[20] to objectArray[4] as you iterate through the array and draw the objects stored in the array elements you can change whether other objects are seen on top or behind other objects.