problem with scale resetting every time !

Android Processing

mataarsak

problem with scale resetting every time !

in Android Processing • 1 year ago

I know that If scale () is called within draw(), the transformation is reset when the loop begins again and I exactly have problem with it ! I got multi touch set up and I could scale the first time without problem , but when I want to do it for second time , the transformation is reset ! how could I solve the problem ?

how could I save the previous scale and make sure that it starts from there ?

Replies(6)

cedrickie..

Re: problem with scale resetting every time !

1 year ago

how exactly do you scale?

you probably pass a variable to the scale function, so if that variable stays the same the scaling is the same. and as you are able to change a variable in the draw loop, you should be able to do the same with the scale...

mataarsak

Re: Re: problem with scale resetting every time !

1 year ago

this is my code for touch events and on draw() I have scale(zoom) ....

float zoom ;

void setup(){

}

void draw(){

scale(zoom);

}

switch (event.getAction() & MotionEvent.ACTION_MASK) {

case MotionEvent.ACTION_POINTER_DOWN:

// User is pressing down another finger.

float x11 = event.getX(0) - event.getX(1);

float y22 = event.getY(0) - event.getY(1);

z4 = sqrt(x11*x11+y22*y22);

break;

case MotionEvent.ACTION_POINTER_UP:

// User is released one of the fingers.

break;

case MotionEvent.ACTION_MOVE:

if (pointNum >= 2 ) {

float x = event.getX(0) - event.getX(1);

float y= event.getY(0) - event.getY(1);

float z3 = sqrt(x*x+y*y);

if (pointNum >= 2 ) {

zoom = z3/z4;

}

PhiLho

Re: problem with scale resetting every time !

1 year ago

Don't forget that scale() must be used with translate().

mataarsak

Re: Re: problem with scale resetting every time !

1 year ago

now the problem is that I get the center point of my finger in touch method , but in draw() when I want to translate to that point in jumps somewhere else in the screen !

PhiLho

Re: problem with scale resetting every time !

1 year ago

Perhaps try and make a little sketch reproducing your problem, that can be tested in regular Processing. Thus we can test and fix the issue.

mataarsak

Re: Re: problem with scale resetting every time !

1 year ago

I created a new topic and posted the code there , hope to find someone that help me fixing the problems .

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