218 lines
6.7 KiB
C++
218 lines
6.7 KiB
C++
// SPDX-License-Identifier: LGPL-2.1-or-later
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/***************************************************************************
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* Copyright (c) 2005 Werner Mayer <wmayer[at]users.sourceforge.net> *
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* *
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* This file is part of the FreeCAD CAx development system. *
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* *
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* This library is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Library General Public *
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* License as published by the Free Software Foundation; either *
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* version 2 of the License, or (at your option) any later version. *
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* *
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* This library is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Library General Public License for more details. *
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* *
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* You should have received a copy of the GNU Library General Public *
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* License along with this library; see the file COPYING.LIB. If not, *
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* write to the Free Software Foundation, Inc., 59 Temple Place, *
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* Suite 330, Boston, MA 02111-1307, USA *
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* *
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***************************************************************************/
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#include <array>
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#include <boost/math/constants/constants.hpp>
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#include <cmath>
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#include <numbers>
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#include <FCConfig.h>
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#ifdef FC_OS_WIN32
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# include <windows.h>
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#endif
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#ifdef FC_OS_MACOSX
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# include <OpenGL/gl.h>
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#else
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# include <GL/gl.h>
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#endif
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#include "SoFCBackgroundGradient.h"
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static const std::array<GLfloat[2], 32> big_circle = [] {
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constexpr float pi = std::numbers::pi_v<float>;
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constexpr float sqrt2 = std::numbers::sqrt2_v<float>;
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std::array<GLfloat[2], 32> result;
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int c = 0;
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for (GLfloat i = 0; i < 2 * pi; i += 2 * pi / 32, c++) {
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result[c][0] = sqrt2 * cosf(i);
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result[c][1] = sqrt2 * sinf(i);
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}
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return result;
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}();
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static const std::array<GLfloat[2], 32> small_oval = [] {
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constexpr float pi = std::numbers::pi_v<float>;
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constexpr float sqrt2 = std::numbers::sqrt2_v<float>;
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static const float sqrt1_2 = std::sqrt(1 / 2.F);
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std::array<GLfloat[2], 32> result;
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int c = 0;
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for (GLfloat i = 0; i < 2 * pi; i += 2 * pi / 32, c++) {
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result[c][0] = 0.3 * sqrt2 * cosf(i);
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result[c][1] = sqrt1_2 * sinf(i);
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}
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return result;
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}();
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using namespace Gui;
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SO_NODE_SOURCE(SoFCBackgroundGradient)
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void SoFCBackgroundGradient::finish()
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{
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atexit_cleanup();
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}
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/*!
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Constructor.
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*/
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SoFCBackgroundGradient::SoFCBackgroundGradient()
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{
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SO_NODE_CONSTRUCTOR(SoFCBackgroundGradient);
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fCol.setValue(0.5f, 0.5f, 0.8f);
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tCol.setValue(0.7f, 0.7f, 0.9f);
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mCol.setValue(1.0f, 1.0f, 1.0f);
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gradient = Gradient::LINEAR;
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}
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/*!
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Destructor.
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*/
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SoFCBackgroundGradient::~SoFCBackgroundGradient() = default;
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// doc from parent
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void SoFCBackgroundGradient::initClass()
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{
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SO_NODE_INIT_CLASS(SoFCBackgroundGradient, SoNode, "Node");
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}
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void SoFCBackgroundGradient::GLRender(SoGLRenderAction* /*action*/)
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{
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glOrtho(-1, 1, -1, 1, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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glPushAttrib(GL_ENABLE_BIT);
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_LIGHTING);
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glDisable(GL_TEXTURE_2D);
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if (gradient == Gradient::LINEAR) {
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glBegin(GL_TRIANGLE_STRIP);
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if (mCol[0] < 0) {
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glColor3f(fCol[0], fCol[1], fCol[2]);
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glVertex2f(-1, 1);
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glColor3f(tCol[0], tCol[1], tCol[2]);
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glVertex2f(-1, -1);
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glColor3f(fCol[0], fCol[1], fCol[2]);
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glVertex2f(1, 1);
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glColor3f(tCol[0], tCol[1], tCol[2]);
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glVertex2f(1, -1);
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}
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else {
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glColor3f(fCol[0], fCol[1], fCol[2]);
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glVertex2f(-1, 1);
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glColor3f(mCol[0], mCol[1], mCol[2]);
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glVertex2f(-1, 0);
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glColor3f(fCol[0], fCol[1], fCol[2]);
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glVertex2f(1, 1);
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glColor3f(mCol[0], mCol[1], mCol[2]);
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glVertex2f(1, 0);
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glEnd();
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glBegin(GL_TRIANGLE_STRIP);
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glColor3f(mCol[0], mCol[1], mCol[2]);
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glVertex2f(-1, 0);
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glColor3f(tCol[0], tCol[1], tCol[2]);
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glVertex2f(-1, -1);
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glColor3f(mCol[0], mCol[1], mCol[2]);
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glVertex2f(1, 0);
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glColor3f(tCol[0], tCol[1], tCol[2]);
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glVertex2f(1, -1);
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}
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}
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else { // radial gradient
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glBegin(GL_TRIANGLE_FAN);
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glColor3f(fCol[0], fCol[1], fCol[2]);
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glVertex2f(0.0f, 0.0f);
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if (mCol[0] < 0) { // simple radial gradient
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glColor3f(tCol[0], tCol[1], tCol[2]);
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for (const GLfloat* vertex : big_circle) {
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glVertex2fv(vertex);
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}
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glVertex2fv(big_circle.front());
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}
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else {
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glColor3f(mCol[0], mCol[1], mCol[2]);
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for (const GLfloat* vertex : small_oval) {
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glVertex2fv(vertex);
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}
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glVertex2fv(small_oval.front());
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glEnd();
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glBegin(GL_TRIANGLE_STRIP);
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for (std::size_t i = 0; i < small_oval.size(); i++) {
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glColor3f(mCol[0], mCol[1], mCol[2]);
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glVertex2fv(small_oval[i]);
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glColor3f(tCol[0], tCol[1], tCol[2]);
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glVertex2fv(big_circle[i]);
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}
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glColor3f(mCol[0], mCol[1], mCol[2]);
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glVertex2fv(small_oval.front());
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glColor3f(tCol[0], tCol[1], tCol[2]);
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glVertex2fv(big_circle.front());
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}
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} // end of radial gradient
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glEnd();
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glPopAttrib();
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glPopMatrix(); // restore modelview
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glMatrixMode(GL_PROJECTION);
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glPopMatrix();
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glMatrixMode(GL_MODELVIEW);
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}
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void SoFCBackgroundGradient::setGradient(SoFCBackgroundGradient::Gradient grad)
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{
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gradient = grad;
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}
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SoFCBackgroundGradient::Gradient SoFCBackgroundGradient::getGradient() const
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{
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return gradient;
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}
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void SoFCBackgroundGradient::setColorGradient(const SbColor& fromColor, const SbColor& toColor)
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{
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fCol = fromColor;
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tCol = toColor;
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mCol[0] = -1.0f;
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}
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void SoFCBackgroundGradient::setColorGradient(
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const SbColor& fromColor,
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const SbColor& toColor,
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const SbColor& midColor
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)
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{
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fCol = fromColor;
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tCol = toColor;
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mCol = midColor;
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}
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