I met a problem with SetViewZoom();

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halley

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Joined: 27th Apr 2011

Location: China

Posted: 6th Jun 2014 06:35

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There are two zoom mode, one is top left, another is centre.
But I need zoom by top,right, bottom,left, bottom,right, how should I do? I try to SetViewOffset to move the view. I never success to reach my goal.

The Miracrea Games

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Van B

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Joined: 8th Oct 2002

Location: Sunnyvale

Posted: 6th Jun 2014 09:47

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Whenever I get stumped like this, I tend to add in some main loop controls... like having a zoom in and out control, or have the view offset scroll with the arrow keys and show the actual offset value.

I think it would be better if you do that and try and figure it out, because only you know exactly how it should work.

I am the one who knocks...

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Markus

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Joined: 10th Apr 2004

Location: Germany

Posted: 6th Jun 2014 10:51 Edited at: 6th Jun 2014 10:51

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u try something like this? just a idea
SetViewZoomMode( 1) //center

at zoom
x=getvirtualwidth()/2
y=getvirtualheight()/2
SetViewOffset( -x, -y )
SetViewZoom( zoom )
SetViewOffset( 0, 0 )

AGK 108 (B)19 : Windows 8.1 Pro 64 Bit : AMD Radeon R7 265

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baxslash

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Location: Duffield

Posted: 6th Jun 2014 20:54

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In my experience it's best to use the top left and calculate any offsets based on that point. The centred view is a mind bender because it doesn't take view zoom into account. It is based on an unzoomed view when you use setViewOffset.

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halley

13

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Joined: 27th Apr 2011

Location: China

Posted: 7th Jun 2014 12:47

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It took me more than 4 hours to solve the problem. I really hope AppGameKit can support zooming by offset.

Now when set view offset, and zoom view by centre mode, the view will move at first, the black screen will appear, and then zoom in. It looks strange. Then I think it over and over, and got a solution finally.
As the following shows, I zoom the view as while as moving the view.

+ Code Snippet

            m_fScale+=0.1;
            agk::SetViewZoom(m_fScale);
            SetViewOffset(m_fScale);
            if (m_fScale>=2.0) {
                m_fScale = 2.0;
                m_bScale = false;
                m_bSetPosition = true;
                m_bZooming=true;
            }

+ Code Snippet

void CChess::SetViewOffset(float fScale)
{
    float fSpeedX=m_iWinWidth/4;
    float fSpeedY=m_iWinHeight/4;
    
    if (m_fX>m_iWinWidth/4*3) {
    }else if(m_fX<m_iWinWidth/4){
        fSpeedX=-fSpeedX;
    }else {
        fSpeedX=m_fX-m_iWinWidth/2;
    }
    
    if (m_fY>m_iWinHeight/4*3) {
    }else if (m_fY<m_iWinHeight/4){
        fSpeedY=-fSpeedY;
    }else {
        fSpeedY=m_fY-m_iWinHeight/2;
    }
    
    agk::SetViewOffset(fSpeedX*(fScale-1), fSpeedY*(fScale-1));
}

The Miracrea Games

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