OSCAR-code/sleepyhead/Graphs/glcommon.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 *
 * glcommon GL code & font stuff
 *
 * Copyright (c) 2011-2014 Mark Watkins <jedimark@users.sourceforge.net>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file COPYING in the main directory of the Linux
 * distribution for more details. */

#include <cmath>
#include "glcommon.h"

#ifdef BUILD_WITH_MSVC
double round(double number)
{
    return number < 0.0 ? ceil(number - 0.5) : floor(number + 0.5);
}
#endif


void RoundedRectangle(int x, int y, int w, int h, int radius, const QColor color)
{

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glColor4ub(color.red(), color.green(), color.blue(), color.alpha());

    glBegin(GL_POLYGON);
    glVertex2i(x + radius, y);
    glVertex2i(x + w - radius, y);

    for (float i = (float)M_PI * 1.5f; i < M_PI * 2; i += 0.1f) {
        glVertex2f(x + w - radius + cos(i)*radius, y + radius + sin(i)*radius);
    }

    glVertex2i(x + w, y + radius);
    glVertex2i(x + w, y + h - radius);

    for (float i = 0; i < (float)M_PI * 0.5f; i += 0.1f) {
        glVertex2f(x + w - radius + cos(i)*radius, y + h - radius + sin(i)*radius);
    }

    glVertex2i(x + w - radius, y + h);
    glVertex2i(x + radius, y + h);

    for (float i = (float)M_PI * 0.5f; i < M_PI; i += 0.1f) {
        glVertex2f(x + radius + cos(i)*radius, y + h - radius + sin(i)*radius);
    }

    glVertex2i(x, y + h - radius);
    glVertex2i(x, y + radius);

    for (float i = (float)M_PI; i < M_PI * 1.5f; i += 0.1f) {
        glVertex2f(x + radius + cos(i)*radius, y + radius + sin(i)*radius);
    }

    glEnd();

    glDisable(GL_BLEND);
}

void LinedRoundedRectangle(int x, int y, int w, int h, int radius, int lw, QColor color)
{
    //glDisable(GL_TEXTURE_2D);
    glShadeModel(GL_SMOOTH);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glColor4ub(color.red(), color.green(), color.blue(), color.alpha());
    glLineWidth((GLfloat)lw);

    glBegin(GL_LINE_STRIP);

    for (float i = (float)M_PI; i <= 1.5f * M_PI; i += 0.1f) {
        glVertex2f(radius * cos(i) + x + radius, radius * sin(i) + y + radius);
    }

    for (float i = 1.5f * (float)M_PI; i <= 2 * M_PI; i += 0.1f) {
        glVertex2f(radius * cos(i) + x + w - radius, radius * sin(i) + y + radius);
    }

    for (float i = 0; i <= 0.5f * M_PI; i += 0.1f) {
        glVertex2f(radius * cos(i) + x + w - radius, radius * sin(i) + y + h - radius);
    }

    for (float i = 0.5f * (float)M_PI; i <= M_PI; i += 0.1f) {
        glVertex2f(radius * cos(i) + x + radius, radius * sin(i) + y + h - radius);
    }

    glVertex2i(x, y + radius);
    glEnd();

    //glEnable(GL_TEXTURE_2D);
    glDisable(GL_BLEND);
}