Re: [android-developers] Matrix. setPolyToPoly

bool SkMatrix::setPolyToPoly(const SkPoint src[], const SkPoint dst[],
int count) {
if ((unsigned)count > 4) {
SkDebugf("--- SkMatrix::setPolyToPoly count out of range %d\n", count);
return false;
}

if (0 == count) {
this->reset();
return true;
}
if (1 == count) {
this->setTranslate(dst[0].fX - src[0].fX, dst[0].fY - src[0].fY);
return true;
}

SkPoint scale;
if (!poly_to_point(&scale, src, count) ||
SkScalarNearlyZero(scale.fX) ||
SkScalarNearlyZero(scale.fY)) {
return false;
}

static const PolyMapProc gPolyMapProcs[] = {
SkMatrix::Poly2Proc, SkMatrix::Poly3Proc, SkMatrix::Poly4Proc
};
PolyMapProc proc = gPolyMapProcs[count - 2];

SkMatrix tempMap, result;
tempMap.setTypeMask(kUnknown_Mask);

if (!proc(src, &tempMap, scale)) {
return false;
}
if (!tempMap.invert(&result)) {
return false;
}
if (!proc(dst, &tempMap, scale)) {
return false;
}
if (!result.setConcat(tempMap, result)) {
return false;
}
*this = result;
return true;
}

On Tue, Sep 25, 2012 at 2:27 PM, TreKing <trekingapp@gmail.com> wrote:
> On Tue, Sep 25, 2012 at 4:19 PM, bob <bob@coolfone.comze.com> wrote:
>>
>> I can't find the source for native_setPolyToPoly though.
>
>
> http://lmgtfy.com/?q=android+native+source
>
>
> -------------------------------------------------------------------------------------------------
> TreKing - Chicago transit tracking app for Android-powered devices
>
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--
Romain Guy
Android framework engineer
romainguy@android.com

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