seti16()

void fl::WaveSimulation2D::seti16	(	size_t	x,
		size_t	y,
		int16_t	value )

Definition at line 142 of file wave_simulation.cpp.

                                                             {
    if (!has(x, y))
        return;
 
    // radius in pixels of your diamond
    int rad = static_cast<int>(mMultiplier) / 2;
 
    for (size_t j = 0; j < mMultiplier; ++j) {
        for (size_t i = 0; i < mMultiplier; ++i) {
            // compute offset from the center of this block
            int dx = static_cast<int>(i) - rad;
            int dy = static_cast<int>(j) - rad;
            // keep only those points whose Manhattan distance ≤ rad
            if (ABS(dx) + ABS(dy) > rad) {
                continue;
            }
            size_t xx = x * mMultiplier + i;
            size_t yy = y * mMultiplier + j;
            if (mSim->has(xx, yy)) {
                int16_t &pt = mChangeGrid.at(xx, yy);
                if (pt == 0) {
                    // not set yet so set unconditionally.
                    pt = v16;
                } else {
                    const bool sign_matches = (pt >= 0) == (v16 >= 0);
                    if (!sign_matches) {
                        // opposite signs, so overwrite
                        pt = v16;
                    } else {
                        // if the magnitude of the new pt is greater than what
                        // was already there, then overwrite.
                        uint16_t abs_pt = static_cast<uint16_t>(ABS(pt));
                        uint16_t abs_v16 = static_cast<uint16_t>(ABS(v16));
                        if (abs_v16 > abs_pt) {
                            pt = v16;
                        }
                    }
                }
            }
        }
    }
}

References ABS, has(), mChangeGrid, mMultiplier, mSim, x, and y.

Referenced by setf().

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