KisScreentoneScreentoneFunctions::DotsRoundLinearEqualized Class Reference

#include <KisScreentoneScreentoneFunctions.h>

Inheritance diagram for KisScreentoneScreentoneFunctions::DotsRoundLinearEqualized:

Public Member Functions
qreal	operator() (qreal x, qreal y) const
Public Member Functions inherited from KisScreentoneScreentoneFunctions::DotsRoundLinear
qreal	operator() (qreal x, qreal y) const

Detailed Description

Definition at line 77 of file KisScreentoneScreentoneFunctions.h.

Member Function Documentation

operator()()

qreal KisScreentoneScreentoneFunctions::DotsRoundLinearEqualized::operator()	(	qreal	x,
		qreal	y ) const

Definition at line 41 of file KisScreentoneScreentoneFunctions.cpp.

{
    // In theory, the cumulative function for this spot function is:
    // "coverage = area of the intersection between the disk formed by the value,
    // and the screen cell".
    // This uses a piecewise cumulative function obtained analytically. If
    // the value is less than or equal to "sqrt(2) / 2" (value at which the
    // disk touches the screen cell borders) then the coverage for that value
    // is obtained simply by getting the area of the disk. If the value is
    // greater than "sqrt(2) / 2" then the coverage is obtained by computing
    // the area of the intersection between the disk and the screen cell (area
    // of the disk minus area of the chords of the disk outside the screen cell)
    const qreal z = DotsRoundLinear::operator()(x, y);
    const qreal zOverSqrt2 = z / M_SQRT2;
    const qreal zOverSqrt2Squared = zOverSqrt2 * zOverSqrt2;
    if (z <= M_SQRT2 / 2.0) {
        return M_PI * zOverSqrt2Squared;
    } else {
        return M_PI * zOverSqrt2Squared -
               4.0 * (zOverSqrt2Squared * std::acos(M_SQRT2 / (2.0 * z)) -
                      0.5 * std::sqrt(zOverSqrt2Squared - 0.25));
    }
}

References M_PI, and KisScreentoneScreentoneFunctions::DotsRoundLinear::operator()().

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The documentation for this class was generated from the following files:

• plugins/generators/screentone/KisScreentoneScreentoneFunctions.h
• plugins/generators/screentone/KisScreentoneScreentoneFunctions.cpp