How to setRotation() after setRotationX() in cocos2d-x?
Obviously cannot call setRotation() after calling setRotationX(), as the second call will cancel the first call.
Thanks.
If you want rotateX and next rotate node
create 2 node: for example nodeToRotate and nodeHelper
add nodeToRotate to nodeHelper
call nodeToRotate->setRotationX()
call nodeHelper->setRotation()
In this way you don't need to rotate in every axis separately
Sprite->runAction(Sequence::create(RotateBy::create(1.0f, 360),DelayTime::create(1.0),RotateTo::create(1.0f, 10, 360),NULL));
Here, RotateTo::create(1.0f, 10, 360)
In 1.0f is Time(Second),10 is RotationX and 360 is RotationY.
Related
I'm beginner for coding, I've questions :
First I'd like know why that code is not moving :
local speed = 5
function cube ()
for i = 1,20,2 do
local rect = display.newRect(50,50,50,50)
rect.x = screenleft-300 + (50*i)
rect.y = _y
rect.x = rect.x - speed
if (rect.x < -450 )then
rect.x = 1200
end
end
end
timer.performWithDelay(1, cube, -1)
Secondly : What's the difference between
Runtime:addEventListener( "enterFrame", cube )
and
timer.performWithDelay(1, cube, -1)
Because I get the same result with both of them
And to be done, Why when I use the function "for" to duplicate something like the square i've done upside, this one put the image behind eachother and not like the square beside eachother ( the image i'm trying to duplicate has more than 4 side )
Thanks for all your reply !
thks a lot dude , I know what you mean by here but my question is little bit weird maybe lol and maybe we can't do it
I try to explain again :
for i=1,10,1 do
local Circle = display.newCircle(50, 20, 20)
Circle.x = _x + (50*i)
Circle.y = _y
end
So here I've a Circle line like that 00000 (imagine 0 are circle ^^)
and I want to make that line moving from the left to the right screen, but when i try to make it move with :
Circle.x = Circle.x - speed
Corona don't recognize the " circle.x " so I can't, maybe because is insert into the"FOR"
SO my question is : "How to move this Circle line if that's possible with the "FOR" ?
I hope I've Been clearer
Anyway, Thanks for all
I'll answer your second question first:
Runtime:addEventListener( "enterFrame", cube )
The function addEventListener adds a listener to the object’s list of listeners. When the named event occurs (in this case "enterFrame"), the listener will be invoked and be supplied with a table representing the event. In your code, the listener will call cube() on every frame (normaly, games run at 60 frames per second).
timer.performWithDelay(delay, listener [, iterations])
performWithDelay does what it says it does: Call a specified function after a delay. The timer function returns an object that can be used with other timer.* functions. In your code timer.performWithDelay(1, cube, -1) the function is calling cube() every 1ms and it is going to do so forever. This is not a good thing to do. There's nothing catching the return of the timer function and it is going to be running forever.
Now, to answer your main question. I believe what you are trying to do is create a square an move it in the screen. If that's correct, here's how you should do it:
local square = display.newRect(100,100,50,50)
local speed = 2
-- called every frame
local function moveSquare()
square.x = square.x + speed
end
Runtime:addEventListener("enterFrame", moveSquare)
The reason your code doesn't do what you want it to do is because you misunderstood a some basic CoronaSDK things.
Hope this little code helps you to understand more about how CoronaSDK works. Don't forget to check the documentation of Corona in http://docs.coronalabs.com/
You're creating an object locally in a loop and trying to move it outside of the loop. This doesn't work due to the way lua uses local variables. See http://www.lua.org/pil/4.2.html for more info about this.
Also, you'll need to place the objects into a single display group in order to move them easily. If you're using Box2D physics at all, I recommend reading up on it more at http://docs.coronalabs.com/api/library/physics/index.html.
Your code:
for i=1,10,1 do
local Circle = display.newCircle(50, 20, 20)
Circle.x = _x + (50*i)
Circle.y = _y
end
Should Be Changed to:
local Circle = display.newGroup(); --Forward declaration of Variable. Place this before any calls for it.
local speed = 2;
for i=1,10,1 do
local object = display.newCircle(50,20,20);
object.x = _x + (50*i);
object.y = _y;
Circle:insert(object); --Insert this local object into the display group
end
function moveCircle()
Circle.x = Circle.x + speed;
end
Runtime:addEventListener( "enterFrame", moveCircle);
This will move the Circle line every frame, on the X-axis, by the speed variable's value.
If you're trying to move it with a for-loop, then we'd need to see more of you code in context.
I'm making a simple game and have a Vector full of enemies in order to do hit-checking on them from my "laser" object (it's a space shmup). Every laser loops through the Vector and checks if it's occluding the hit circle. The problem lies in when one laser destroys an enemy, the rest of the lasers try to also check the same Vector, only to go out of bounds since the enemy's already been spliced out and it's changed the size of the Vector.
for each (var enemy:Enemy in enemies){
var distanceX = this.x - enemy.x;
var distanceY = this.y - enemy.y;
var distance = Math.sqrt( (distanceX*distanceX) + (distanceY*distanceY) );
if (distance <= enemy.hitRadius) {
enemy.removeEnemy();
enemies.splice(enemies.indexOf(enemy),enemies.indexOf(enemy));
}
}
How would I go about collecting the index of individual elements in the Vector to be deleted, then only deleting them when every Laser object is finished its checking?
edit: here's my removeEnemy() function from my Enemy class, just in case:
public function removeEnemy(){
removeEventListener(Event.ENTER_FRAME, move);
parent.removeChild(this);
trace("removed Enemy", enemies.indexOf(this));
}
edit edit: I'm also getting a null reference pointer error to "parent" in my removeEnemy() function... but only sometimes. I have a feeling that if I fix one of these two problems, the other will also be fixed but I'm not sure.
I fixed it! The problem was actually in how I used the "splice()" method. Turns out that the second parameter isn't the end index of where to stop splicing, it's the number of elements to be spliced. So when I was trying to splice element 0, I wasn't splicing anything, and when I was trying to splice element 3, I was also splicing 4 and 5. I feel like such a dunce for not reading the API right and wasting a couple hours on this. Thanks to everyone who commented-- you guys helped me rule out what I thought the problem was.
First of all sorry for some english mistakes. Portuguese is my first language(I am from Brazil)
Im trying to make a space game from scratch in AS3 and the way to move the ship is like in the game Air Traffic Chief.
I succeed at some point. But when the ship is very fast it start to shake and its not very smooth and clean as I want.
Here is what i have done: http://megaswf.com/s/2437744
As the code is very big so I pasted in pastebin: pastebin.com/1YVZ23WX
I also wrote some english documentation.
This is my first game and my first post here. I really hope you guys can help me.
Thanks in advance.
Edit:
As the code is very big i will try to clarify here.
When the user MouseDown and MouseMove the ship every coordinate is passed to an array.
When the user MouseUP this array is passed to a function that fix the array.
For example: If the distance between two coordinates is greater than 5px, the function creates a coordinate in the middle of the two coordinates.
if I take this function off the problem seen to be solved. But if the user move the mouse very slow it still happens. It also creates a problem that i was trying to solve with that function. as the distance of the two coordinates are very big when the ship arrive in one coordinate most of the line path disappear.
I uploaded a version without the function that fixes the array. http://megaswf.com/s/2437775
I think there is 2 ways for solving this problem
1- Try to fix the noise in the array of coordinates 2- Take off the function that create an coordinate between two points and try to fix the problem of the line path disappear.
Here is the 2 important functions:
this function moves the ship
private function mover():void
{
if (caminhoCoords[0]!=null) // caminhoCoords is the array that contain the path
{
var angulo:Number = Math.atan2(this.y - caminhoCoords[0][1], this.x - caminhoCoords[0][0]);
this.rotation = angulo / (Math.PI / 180);
this.x = this.x - velocidade * (Math.cos(angulo));
this.y = this.y - velocidade * (Math.sin(angulo));
var testex:Number = Math.abs(this.x - caminhoCoords[0][0]); //test to see the distance between the ship and the position in the array
var testey:Number = Math.abs(this.y - caminhoCoords[0][1]);
if (testey<=velocidade+2 && testex<=velocidade+2) // if is velocidade+2 close then go to the next coordnate
{
caminhoCoords.shift();
}
}
}
This function draw the line:
private function desenhaCaminho():void //draw the black Path
{
if(caminhoCoords.length>=1)
{
caminho.graphics.clear();
caminho.graphics.lineStyle(1, 0x000000, 1,true);
caminho.graphics.moveTo(caminhoCoords[0][0],caminhoCoords[0][1]);
for (var i:int = 1; i < caminhoCoords.length; i++)
{
caminho.graphics.lineTo(caminhoCoords[i][0], caminhoCoords[i][1]);
}
}else
{
caminho.graphics.clear();
}
}
Every time the ship arrive in one coordinate is take that coordinate off the array and redraw the array.
Is there a better way of doing that?
I believe if you set your registration point of the plane to the centre and use .snapto(path), it will improve the action.
Judging from just the look of the stuttering, I would guess you need to smooth out the "line" a fair bit. It's probably picking up a lot of noise in the line, which is then translated into the rotation of the plane. Either smooth out the rotation/position of the plane, or the line itself.
when tracing the mouseX / mouseY or localX / localY coordinates of a display object, why does x start at 1 while y starts at 0?
for example, i've drawn a simple 400 x 400 pixel sprite onto the stage with a MouseEvent.MOUSE_MOVE event listener that calls a handler function to trace the local coordinates of the mouse.
the first, top-left pixel returns {x:1, y:0} and the last, bottom-right pixel returns {x:400, y:399}. shouldn't both the x and y start and end with the same value? i'm not sure which makes more sense for a the first mouse coordinate (either 0 or 1) but it certainly doesn't make sense that they are different?
[SWF(width = "1000", height = "600", backgroundColor = "0xCCCCCC")]
import flash.display.Sprite;
import flash.events.MouseEvent;
var darkBlueRect:Sprite = createSprite();
darkBlueRect.x = 23;
darkBlueRect.y = 42;
addChild(darkBlueRect);
darkBlueRect.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveEventHandler);
function mouseMoveEventHandler(evt:MouseEvent):void
{
trace(darkBlueRect.mouseX, evt.localX, darkBlueRect.mouseY, evt.localY);
}
function createSprite():Sprite
{
var result:Sprite = new Sprite();
result.graphics.beginFill(0x0000FF, 0.5);
result.graphics.drawRect(0, 0, 400, 400);
result.graphics.endFill();
return result;
}
Report a bug, you've found one:
http://bugs.adobe.com/flashplayer/
I thought perhaps it was to make room for a line applied to the sprite among other things but all those tests proved not to be the case. This is, in my opinion, a bug. File it and I'll second it, or if you can't be bothered let me know I'll file it cause it should be fixed.
Update
I've just tried another test where I set the stageScaleMode to allow for scaling, then zoomed in 2-3 times to the object and tried to get a 0/0 reading on MOUSE_DOWN. Just can't be done apparently. I did get a 0 reading on the X finally but then the Y is out. I think this issue may come down to the fact that flash returns X/Y pointer position as a Number and not an int, and you can get decimal values on the pointer position as you'll notice if you're zoomed in. Perhaps it's just buggy code or it comes down to floating point precision issues based on how the decimal points are calculated, or if you're not zoomed in and the object isn't scaled, flash rounds that decimal value off an int and this may also explain the weird behavior. Dunno just guessing, thought I'd add the results of this extra test.
I'm just trying to avoid rolling my own dragging functionality. Does anyone know of any libraries out there that have a startDrag() equivalent where you can use, say, a circular radius for the drag bounds, rather than a rectangular box?
(For circular drag area) - What you need to do is:
a) Mouse_down: Store start position. Start listening to Enter_frame.
b) Enter_Frame: Check distance from mouse position of mouse to start pos (use pythagoras)
c) only move your object if the distance is less than x
d) Mouse_up: Stop listening to enterframe
You can use a simple circular collision detection routine, it works out the hit area using the radius of the objects and distance between them. Maybe you will have to manually do this calculation in your onDrag method and stop the drag on collision with the circular bounds calculated below.
var deltax : Number = targetCentreCoord.x - hitTestCentreCoord.x;
var deltay : Number = targetCentreCoord.y - hitTestCentreCoord.y;
//works out if our circles are colliding, distance between the circles inc radius
if (((deltax * deltax) + (deltay * deltay)) <= ((((targetRadius) + (hitTargetRadius)) * ((targetRadius) + (hitTargetRadius)))))
{
Log.info("collision occured with " + candidate.name + " target coords " + targetCentreCoord + " candidate coords " + hitTestCentreCoord);
return true;
}
return false;
Nope, you need to do pixel-perfect collision (or in this case, mouse clicking) in order to do that. By nature all display objects always have rectangular bounds to them. So basically you'd have to do something like this:
mySprite.addEventListener(MouseEvent.MOUSE_DOWN, mousedDown);
function mousedDown(e:MouseEvent):void
{
//Draw my sprite to a bitmap, then check the bitmap colour at mouseX/mouseY
uint colour = myBitmap.getPixel32(mouseX, mouseY);
if(colour != TRANSPARENT){
//We've actually clicked on the object, drag it
Sprite(e.currentTarget).startDrag();
}
}
Note this is just pseudo code, you'll have to figure out what uint value transparent comes up as, and also you'll have to account for where the origin point of the sprite is when drawing to bitmap. Say you have a sprite and the contents are inside, you're going to need to create a Matrix object that has a X and Y offset that are negative .5 times the width of your sprite in order to draw it properly.
This can be done without ENTER_FRAME event.
Have a MOUSE_DOWN listener, check boundaries there, if within boundaries, then
add a MOUSE_MOVE listener.
Also, start out with a MOUSE_UP listener to remove the MOUSE_MOVE listener.