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Collision detection : Circle vs Rectangle

detection only

int CheckHit( F_RECT *prcRect1, F_CIRCLE *pcrCircle2 )

{

    int             nResult = false;

    float           ar;

    if ( ( pcrCircle2->x > prcRect1->fLeft   - pcrCircle2->r ) &&

         ( pcrCircle2->x < prcRect1->fRight  + pcrCircle2->r ) &&

         ( pcrCircle2->y > prcRect1->fTop    - pcrCircle2->r ) &&

         ( pcrCircle2->y < prcRect1->fBottom + pcrCircle2->r ) )

    {

        nResult = true;

        ar = pcrCircle2->r;

        if ( pcrCircle2->x < prcRect1->fLeft ) {

            if ( ( pcrCircle2->y < prcRect1->fTop ) )

            {

                if ( ( DistanceSqr( prcRect1->fLeft,  prcRect1->fTop,

                                    pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

                    nResult = false;

                }

            }

            else {

                if ( ( pcrCircle2->y > prcRect1->fBottom ) )

                {

                    if ( ( DistanceSqr( prcRect1->fLeft,  prcRect1->fBottom,

                                        pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

                        nResult = false;

                    }

                }

            }

        }

        else {

            if ( pcrCircle2->x > prcRect1->fRight ) {

                if ( ( pcrCircle2->y < prcRect1->fTop ) )

                {

                    if ( ( DistanceSqr( prcRect1->fRight,  prcRect1->fTop,

                                        pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

                        nResult = false;

                    }

                }

                else {

                    if ( ( pcrCircle2->y > prcRect1->fBottom ) )

                    {

                        if ( ( DistanceSqr( prcRect1->fRight,  prcRect1->fBottom,

                                            pcrCircle2->x, pcrCircle2->y ) >= ar * ar ) ) {

                            nResult = false;

                        }

                    }

                }

            }

        }

    }

    return nResult;

}

대화의 격률

 https://ko.wikipedia.org/wiki/%EA%B7%B8%EB%9D%BC%EC%9D%B4%EC%8A%A4%EC%9D%98_%EB%8C%80%ED%99%94%EA%B2%A9%EB%A5%A0

Unreal Engine's DrawDebugCone

There are two versions of implementation of DrawDebugCone.

One it takes two angles in radians and other one takes degrees. OTL

Order of mov (assembler)

mov ax, 3

which mean move a number 3 into ax register. This is an intel assembler order.

Other assembler use opposite order for instance

mov 3, ax

which is exactly same meanning like shown above.

three types of locks

 1. Try lock

try it only once

2. Spin lock

try forever until it acquires the lock

3. Timeout lock

try it for up to some period of time

UGameplayStatics, Static class with useful gameplay utility functions

 UGameplayStatics, Static class with useful gameplay utility functions