ScreenSize in landscape « Sparrow Forum

ScreenSize in landscape

(11 posts) (4 voices)

Started 1 year ago by seivan
Latest reply from seivan

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seivan
Member

CGSize screenSize = [CCDirector sharedDirector].winSize;
CGPoint lowerLeftCorner = CGPointMake(0, 0);
CGPoint lowerRightCorner = CGPointMake(screenSize.width, 0);
CGPoint upperLeftCorner = CGPointMake(0, screenSize.height);
CGPoint upperRightCorner = CGPointMake(screenSize.width, screenSize.height);

How does one make that in landscape mode on Sparrow? (That above is from Cocos)

I use
cpVect lowerLeft = cpv(0,0);
cpVect lowerRight = cpv(320, 0);
cpVect upperRight = cpv(320,480);
cpVect upperleft = cpv(0,480);

But it seems to work, but I don't really like writing the numbers like that.
Also, it doesn't seem right that upperleft is 0,480

Posted 1 year ago #
Daniel
Primary Feather

Hi Seivan,
sorry, I don't quite understand what you want to achieve! Could you rephrase your question? (Perhaps it's too soon in the morning, sorry ;-))

Posted 1 year ago #

I want to put boundaries within the physics engine but I can't get the screenSize, is there a way to get it like cocos is using [CCDirector sharedDirector].winSize;
Keep in note that I am in landscape mode.
This is currently working but I hate writing out the numbers statically.
Also, this is a bit weird because upperleft is in the upper left but it SHOULDN't be there.
480 should be the X value....

cpVect lowerLeft   = cpv(0,0);
    cpVect lowerRight  = cpv(320, 0);
    cpVect upperRight  = cpv(320,480);
    cpVect upperleft  = cpv(0,480);

    float massGround = INFINITY;
    float inertia = INFINITY;
    cpBody *staticBody = cpBodyNew(massGround, inertia);

    cpShape *shape;
    float e = 1.0f;
    float f = 1.0f;
    float r = 0.0;

    shape = cpSegmentShapeNew(staticBody, lowerLeft, lowerRight, r);
    shape->e = e;
    shape->u = f;
    shape->collision_type = 1;
    cpSpaceAddShape(space, shape);

    shape = cpSegmentShapeNew(staticBody, lowerLeft, upperleft, r);
    shape->e = e;
    shape->u = f;
    cpSpaceAddShape(space, shape);

    shape = cpSegmentShapeNew(staticBody, upperRight, lowerRight, r);
    shape->e = e;
    shape->u = f;
    cpSpaceAddShape(space, shape);

Posted 1 year ago #

Daniel
Primary Feather
To get the screen size, you can simply get the width and height of the stage.
```
float width = self.stage.width;
float height = self.stage.height
```
But this will, of course, always return the screen size in portrait mode. I guess you achieve landscape mode by rotating the topmost sprite of your game (as I wrote in a tutorial) and then adding the objects to that sprite; so Sparrow itself does not know that the content is in landscape mode.

So I would just get width and height of the stage as shown above and create the 4 corner points manually with this information.
Posted 1 year ago #
seivan
Member

Yeah that is what I am doing now =)
sprite.rotate = SP_DR(90) and etc.... all that.

The problem is I can't tell what is what. I can't tell where for instance 300, 300 is in my physics engine or sparrow or UIVIEW bullshit.

There needs to be a way to get portal mode in Sparrow without having to make an ugly hack like this, doing the rotation messed everything up.

WHat numbers would you write in here?
because these are not correct if I do it like you said, but they work.

cpVect lowerLeft = cpv(0,0);
cpVect lowerRight = cpv(320, 0);
cpVect upperRight = cpv(320,480);
cpVect upperleft = cpv(0,480);

Posted 1 year ago #
Daniel
Primary Feather

If it's any help, you can translate a point from any coordinate system into any other. If I get a touch event on the SPView (from UIKit), I have to convert it into any coordinate system (sprite) to find out if something was hit.

For that reason, there's the method "transformationMatrixToSpace:" in SPDisplayObject. You can then multiply an SPPoint with that matrix to find out where it is in a certain coordinate system.

Look for the method in the unit tests (or other Sparrow code) to find out how to use it. There are also the simpler methods "localToGlobal" and "globalToLocal".

As for the points you posted: I don't know how Box2D (or whatever you're using) needs them, but in Sparrow, the lower left point would be (0,320) or (0,480), depending on the orientation.

Posted 1 year ago #
seivan
Member

I don't understand what those methods has to do with this issue.

My problem right now is that I don't understand how sparrow does it's magic with the corners.
cpVect lowerRight = cpv(320, 0); <=== How can this be lower right?
When in sparrow that is like in the middle at the top.

Posted 1 year ago #
Daniel
Primary Feather

OK, seems as if I've still not understood what you want.

Is your point (320, 0) on the lower right, and you don't know why, or do you want to modify your scene in a way that (320, 0) IS in the lower right (because normally, it is in the upper right)?

Posted 1 year ago #
baike
Moderator
Sprarrow landscape coords are like this:
```
(0,0)                  (480,0)

(0,320)                (480,320)
```
Box2D coords are like this:
```
(0,320)                (480,320)

(0,0)                  (480,0)
```
Of course this assumes a Box2D PTM ratio of 1:1, which is unlikely. I use 8:1, but it depends on what your world is simulating. This is why I use the macros I posted in another thread. If what you are doing is working, then I would say you're doing something else wrong. Your description would match Sparrow in portrait. In portrait it would be like this:

Sparrow:
```
(0,0)                  (320,0)

(0,480)                (320,480)
```
Box2D:
```
(0,480)                (320,480)

(0,0)                  (320,0)
```
Posted 1 year ago #
Dan
Member

For what it's worth I think seivan is using Chipmunk, doesn't change anything anyone's said, I just thought i'd throw it out there

Posted 1 year ago #
seivan
Member

nvm..
I had 480- in the run loop

run.y = (480-shape->body->p.y)/2;

it should be run.y = (320-shape->body->p.y)/2;
Thanks for everything guys!

Posted 1 year ago #

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