i expect this is quite an easy one.
I'm trying to simulate a falling Bean Bag that can be knocked into a net on one side of the screen.
I have:
a dynamic body and circle shape representing a hand or bat, which moves respective to the mouse.
falling dynamic body circle shapes representing the Bean Bags.
and simply, two small circle shapes representing the net's open top.
To move the hand/bat i update a linear velocity on each step, so that this force can be applied to the bean bag:
// move hand
deltaX = (handBody.GetPosition().x * scaleF) - mouseX;
deltaY = (handBody.GetPosition().y * scaleF) - mouseY;
var newVel:b2Vec2 = new b2Vec2(-deltaX, -deltaY);
handBody.SetLinearVelocity(newVel);
My problem is that I would like the Bean Bag to absorb some of the initial force of the knock. At the moment it's too easy for the falling bags to be flung off the screen with a quick swipe. Is there a simple way to use the friction, damping or other settings? I have tried but cannot seem to create the effect. Can anyone suggest how i can remove some of the collision force manually without effecting the updated position of the bat/hand?
tia,
Chris
Can't you just multiply the new velocity/bean bag velocity with say 0.8 or whatever and call this the dampening effect?
But the provided code seems weird, I can't see anything in it related to impact or hitting a bean bag. This just sets the vel of hand?
Related
My player's arm is programmed to follow my mouse and rotate accordingly and I've programmed bullets to be fired using this rotational value
(Math.atan2(this._dy, this._dx) * 180 / Math.PI
where _dy is the y location of the mouse (-) the y of my player's arm and the _dx is the x location of mouse (-) the y of my player's arm.
However, when I program the player to reflect when the mouse has crossed the x-coordinates, the bullet angle is also reflected. How would I fix this issue?
I've already tried subtracting 180 from the angle but it still doesn't fire towards the direction of the mouse.
First, make sure you have this parent-child-sibling relationship:
"A" should be the parent of "B" and "C". "B" and "C" should have no direct link. Their connection is that they have the same parent. So when you want to move the character, move the parent, and both will move. Now, for the good stuff:
Use key frames and sibling relationship
beginner level approach
Make the character and the arm both children of the same parent display object container (Movie Clip in this case). Now, instead of flipping anything by xScale, which I assume you did, you can just have both MC children (arm and character) go to frame 2 (or whatever is available) where the graphics are flipped.
xScale body, move arm to frame 2, change z order
moderate level approach (best result)*
Alternatively, you could do that same "sibling" setup as above, and then scale the character but not the arm (I think scaling the arm will mess it up again, but you could have the arm go to frame 2 and have it drawn reversed so the thumb and handle are pointing the right way. Bonus points for changing the z stacking order so the arm goes to the other side of the body. xScale for only the body allows you to only have one set of frames for animation of his legs and torso etc. but also avoid scaling the arm at all).
Global properties
advanced approach
A third option is to use global rotation and global points. I won't illustrate that here because I'm not that advanced and it would take me a while to figure out the exact syntax. If you already have mastered global properties, try this; if not, try one of the ones above.
* Example (best result)
if (facingRight == true && stage.mouseX < totalChar.x){
// totalChar is on the stage
// and contains two children:
// armAndGun and bodyHeadLegs
totalChar.armAndGun.gotoAndStop(2);
// in frame 2 of the arm MC, draw the
// arm and gun in the flipped orientation
totalChar.addChild(bodyHeadLegs);
// re-ads body to parent so it's
// z-order is above the arm;
totalChar.bodyHeadLegs.xScale = -1;// flips body and any animation of legs and head
facingRight = false;
// use a variable or property like this
// to keep him from constantly flipping
}
You'll need similar code to flip him back the other way.
I'm new to ActionScript 3 and I have a character which you can control, the screen scrolls right along the stage and he can fire missiles.
The problem I'm getting is the missiles are created via these co-ords:
bullet.x = hero.mc.x;
bullet.y = hero.mc.y
These work fine untill the screen has scrolled to the right. I assume it's because the bullets are being spawned as a result of them using the canvas x,y and not the stages x,y
So i'm wondering how to find out the x and y of my hero in relative to the canvas so i can spawn the missiles on top of him!
Thanks, and if you need any more information let me know, I'm new to all this. Thank you.
You can do that with localToGlobal and globalToLocal. Your solution would be something like:
bulletPos = bullet.parent.localToGlobal(new Point(bullet.x, bullet.y));
Beware, though, as those are last resort functions. Normally, you'd have all your elements using the same 'layer', so comparisons are easier and faster.
I am creating a fighting game. I've got a spritesheet for the hero and a spritesheet for a monster. Since both will be able to do multiple attacks I would like to avoid to merge them in a single spritesheet. And I am intending to create more characters.
Now I am creating a SpriteBatchNode for each spritesheet and add them to layer.
CCLayer* stage = CCLayer::create();
CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("character_hero.plist");
this->characterHeroBatchNode = CCSpriteBatchNode::create("character_hero.pvr.ccz");
CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("character_monster.plist");
this->characterMonsterBatchNode = CCSpriteBatchNode::create("character_monster.pvr.ccz");
stage->addChild(characterHeroBatchNode);
stage->addChild(characterMonsterBatchNode);
Now I have one sprite in characterHeroBatchNode and multiple in characterMonsterBatchNode.
How can I reorder the monsters and the heros z-Order based on their PositionY attribute.
For example>
monster1->setPositionY(10); // In monster batch node
hero->setPositionY(24); // In hero batch node
monster2->setPositionY(43); // In monster batch node
I want the monster 1 behind the hero. And the hero behind monster2.
In the past, I've had to create games where I wanted some sprites in the foreground and others in the background. The sprites were in different sheets, like you have them.
To get them in the order I wanted, I put the "front" sprites into one CCLayer and the "back" sprites into another CCLayer. I added the layers to the scene in the order I wanted them to appear. I also manipulated each the respective layers to make them fade in/out as needed. So you could have the hero in the scene and then have the enemies appear behind him.
If you want to mix and match, you can have 3 layers, one for the "middle ground", one for "front", and one for "back", and dynamically move the sprites between the layers.
Was this what you were looking for?
If I understand what you're asking, the answer is, you can't. Consider each CCSpriteBatchNode to be its own container. You can adjust the Z order of the sprites inside the CCSpriteBatchNode, but when you add the batch to the CCLayer the whole CCSpriteBatchNode is applied to the CCLayer in whatever Z order you added it at. So in order to do what you want you would need another batch of monsters. Or use CCSprites and add/adjust them on the CCLayer in the way you want, but then you obviously lose the CCSpriteBatchNode benefits.
This should be fairly simple I'd think, I'm just not that familiar with actionscript haha.
I have a game where I have the background moving behind a character that stays in one position on screen. I'm relatively new to actionscript 3 but I'm wanting to have text boxes pop up whenever the player presses a key over certain objects passing in the background.
So, basically the background itself is a movie clip, and I have other graphics and movie clips within the background mc.
I was thinking of getting the player.x and y position and then "comparing" that position (>= and <=, etc.) with the graphic/movie clip in the background. But I just don't know how to obtain the x and y coordinate of the graphics/movie clips in the background mc.
You could try to target your movie clips in the background by getting their coordinates, then removing their parent's position (the background container).
Something like :
var finalXPosition:int = targetMovieClip.x - backgroundContainer.x;
var finalYPosition:int = targetMovieClip.y - backgroundContainer.y;
By substracting the target movieclip parent's position to its position, you gain the final position in the parent's scope coordinates.
It should work for you as soon as your character and your background container are situated at the same level of the display list.
Here is a quick diagram of what I try to explain (please forgive my inaptitude to draw nice and explicit drawings ^^)
Usually, when I stumble upon such a case, I try to make a quick and even dirty drawing, starting with what I want, then breaking down every useful data I have to achieve that result, you should keep that method in mind and try it the next time ! :-)
Basically i have x circles represented as MovieClips.
They are all assigned the same base color (for example red).
They should all have a brightness property ranging from 0 to 1 (0 would be completely white and 1 completely red).
I would like the following properties for representing these circles on stage:
When the circles dont overlap they are represented as stated above.
When the circles overlap the overlapping region should have the same base color as the original circles but the brightness of that area should be the sum of the brightnesses of all the circles that define the overlap.
The brightness saturates at 1. So the overlap of 2 circles with brightness 0.8 is 1 (the maximum value) instead of 1.6.
I am wondering if there is some kind of BitmapFilter i could use on the circles to achieve these properties? Or am I looking in the wrong place?
I am relatively new to Actionscript so any pointers are welcome!
Hi and welcome to SO and AS3!
I'll take each point separately:
1) Quite simple, you've probably already figured out that "addChild()" will add MovieClip objects to the Display List, meaning Flash will render them every frame.
2) The easiest way to do this is through "Blend Modes", which is Adobe's way of handling overlapping display objects.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/DisplayObject.html#blendMode
Try setting the .blendMode property of each circle to BlendMode.ADD:
var circle:MovieClip = new MovieClip();
circle.blendMode = BlendMode.ADD;
3) If BlendMode.ADD doesn't give you the results you want, try creating a custom shader to do the job.
http://help.adobe.com/en_US/as3/dev/WSB19E965E-CCD2-4174-8077-8E5D0141A4A8.html
IMHO Blendmode is the easiest way of achieving the desired effect, and blendShader if you want precise customization. Please comment if you have further questions!
Some tutorials and examples:
http://www.learningactionscript3.com/2007/11/03/more-properties-blendmodes-filters/
http://active.tutsplus.com/tutorials/games/introducing-blend-modes-in-flash/
Cheers,
J