I there a way to "detect" if a particular sprite is within the viewable area of a scrollRect?
I have a list of thumbnails in a scrollRect and I only want to load images for these thumbnails if and when the thumbnail sprite is visible in the scrollRect.
Any tips or suggestions on how to accomplish something like this?
You could always use
if (Sprite.getBounds().intersects(scrollRect)) {
//In view
}
as a test. Basic rectangle intersection.
I think the easiest way would be to check for overlap between the two rectangles. You can get a bounds rectangle from any DisplayObject with: myObject.getRect():Rectangle, or getBounds():Rectangle. You can then test this against the scroll rectangle for overlap.
There is a native overlap method on Rectangle, (rect1.intersects(rect2)):Boolean. I prefer to use a custom method for performance reasons though:
var overlap:Boolean = (r1.left < r2.right && r1.right > r2.left && r1.top < r2.bottom && r1.bottom > r2.top);
Good luck!
Related
Not sure if this is possible but going to ask: is there a way of being able to resize a symbol (in this case, a movie clip) in an swf file by clicking and dragging it with your cursor?
One of the things I need to do is have a rectangle within my published swf file that can be resized in height and width by clicking and dragging the sides or corner of the rectangle. Not sure at all how to do this, though. Any tutorials I could look at or maybe something that's somewhat easy to do/explain here? Right now from what little I've found on the subject, it seems like a complex thing to do.
Thanks.
There is no standard option for that, so you have to code it yourself. My suggestion:
You could add a small MovieClip, looking like an arrow, right next to your scalable item. Make this arrow horizontally draggable and whenever you drag this arrow, update the width of the scalable item according to the new position of the arrow. In this case you can scale your item horizontally, but you can use the same approach to make it vertically or diagonally scalable.
#Lodewijck - Your suggestion worked, thank you!!
This may not be the best way to write the code but it worked:
stop();
import flash.events.MouseEvent;
stage.addEventListener(MouseEvent.MOUSE_MOVE,resize1);
this.addEventListener(MouseEvent.MOUSE_DOWN, startDragging, true);
this.addEventListener(MouseEvent.MOUSE_UP, stopDragging, true);
function startDragging(e:MouseEvent) {
dragsquare.startDrag();
}
function stopDragging(e:MouseEvent) {
dragsquare.stopDrag();
}
function resize1(E:MouseEvent){
square1.width=dragsquare.x - square1.x;
square1.height=dragsquare.y - square1.y;
}
I'm looking for a simple and quick way to clear the entire Phaser screen, like how in HTML5 canvas you can erase everything by resetting the width of the canvas to itself. I couldn't find any such method with a search - only graphics.clear(), but that doesn't hit other stuff like text objects. Is there such a way to clear screen?
Thanks.
There are methods to destroy specific elements - obj.kill() and obj.destroy() - but it is possible to delete all elements by calling game.world.removeAll().
#FabiánRodríguez replied, but you can also make a array or object literal with the objects you'd like to remove, so iterate and remove each. That is when you want to group objects.
var layout = {
rect: new Phaser.Rectangle(0, 0, 200, 200)
};
for(var i in layout) {
layout[i].kill();
layout[i].remove();
}
I am working on a flash sound mixer application with multiple sound channels, and I am having trouble with the lights beside the volume knob.
Is there a way to hide just a part of an image?
On the image below, image-2 is on top of image-1 to create some kind of volume level indicator effect, and how much of image-2 is shown depends on the value of the volume.
image-url: http://s30.postimg.org/r3ow1g5bl/volume_lights_level.png
I've tried by just reducing the height of image-2, but it looks awful and distorted.
Is there something in flash that works closely the same as CSS's behavior.
example: I'll just make image-2 a background of a shape, and when I reduce the shape's height, the image-background does not get distorted or changes it's height as well.
By searching for solutions, I have come across the mask property, but I don't quite understand how it works, and most of the examples shown are images placed inside circles.
Is the mask property applicable in this situation?
I'm quite new to flash so I don't know a lot of things yet.
You can indeed use a mask.
How to programmatically create your mask
Put an occurrence of your image named myImage on the stage, and put over this occurrence a mask named myMask with the same dimensions. You can apply myMask mask to myImage using it's mask property like below:
Main Timeline
myImage.mask = myMask;
function mouseMoveHandler(e:MouseEvent):void {
myMask.height = myImage.y - e.stageY;
}
stage.addEventListener(MouseEvent.MOUSE_MOVE, mouseMoveHandler);
You have just to adapt this code to your animation, in the function where you click your button.
I got it working now, many THANKS #VC.One. heres how I did it.
Imported img-2 to stage, converted it into symbol(type:Movie Clip), assigned instance name: img2_mc.
I created a new layer for the mask, drawn a rectangle using rectangle tool, converted it also to symbol(type:Movie Clip), assigned instance name: mask_mc.
Then applied the mask to img2_mc.
/* the code */
img2_mc.mask = mask_mc;
function onEnterFrame(event:Event):void{
var volumeKnob_y = volSliderKnobOn.y + 12; // adjust it to the center of the knob
mask_mc.height = volumeKnob_y;
}
I've included a zoom functionality similar to the one explained at this website:
http://www.flashandmath.com/howtos/zoom/
This works perfectly on my background image(a map, that is), but I want to keep the symbols on my map the same size while zooming in.
I probably could work this out by changing all the children's size when calling the zoom-function, but I am hoping there is some kind of easy code adapt in my children class to make the size of the instances unchangable. Is there?
Thanks!
One crude way, so you don't have to calculate the symbols scale, would be to remove the symbols from the mapDisplayObject so they're no longer a child and instead put symbol placeholders. Then match each symbol's x and y to each place holder, using localToGlobal...
If your children are not scaled or skewed or rotated you can iterate all of them and set transformation matrix to 1/parentScale. Something like:
for each (var child:DisplayObject in parent) {
var matrix:Matrix = child.transform.matrix;
matrix.a = 1/parentScale;
matrix.d = 1/parentScale;
child.transform.matrix = marix;
}
I am new to AS3 scripting. I have a wide image (movie clip "preform_mc") that I am masking and would like for right button ("right_mc") to dynamically move the image.
The code below moves the image to the right, but its not a dynamic movement (would like an animation effect) and I cant control when the image should stop moving, basically a max amount for the x coordinate.
any help is greatly appreciated!
right_mc.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler_2);
function fl_MouseClickHandler_2(event:MouseEvent):void
{
preform_mc.x += -100;
}
Take a look at Greensock Tweening Library. Using that library you'll be able to easily make a smooth animation of a moving image. For the control of max X you should write an if statement to check whether preform_mc.x is more than the max amount you want.
Code will look something like this:
var min_x:int = -500;
function fl_MouseClickHandler_2(event:MouseEvent):void
{
if(min_x < preform_mc.x)
TweenLite.to(preform_mc, 0.5, {x:preform_mc.x - 100}); // using the library I provided a link to
}