src/scenegraph/PieChartMaterial.h

0001 /*
0002  * This file is part of KQuickCharts
0003  * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
0004  *
0005  * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
0006  */
0007
0008 #ifndef PIECHARTMATERIAL_H
0009 #define PIECHARTMATERIAL_H
0010
0011 #include <QColor>
0012 #include <QSGMaterial>
0013 #include <QSGMaterialShader>
0014
0015 #include "SDFShader.h"
0016
0017 class PieChartMaterial : public QSGMaterial
0018 {
0019 public:
0020     PieChartMaterial();
0021     ~PieChartMaterial();
0022
0023     QSGMaterialType *type() const override;
0024     QSGMaterialShader *createShader(QSGRendererInterface::RenderMode) const override;
0025
0026     QVector2D aspectRatio() const;
0027     float innerRadius() const;
0028     float outerRadius() const;
0029     QColor backgroundColor() const;
0030     bool smoothEnds() const;
0031     float fromAngle() const;
0032     float toAngle() const;
0033
0034     QList<QVector2D> segments() const;
0035     QList<QVector4D> colors() const;
0036
0037     void setAspectRatio(const QVector2D &aspect);
0038     void setInnerRadius(float radius);
0039     void setOuterRadius(float radius);
0040     void setBackgroundColor(const QColor &color);
0041     void setSmoothEnds(bool smooth);
0042     void setFromAngle(float angle);
0043     void setToAngle(float angle);
0044
0045     void setSegments(const QList<QVector2D> &triangles);
0046     void setColors(const QList<QVector4D> &colors);
0047
0048 private:
0049     QVector2D m_aspectRatio;
0050     float m_innerRadius = 0.0f;
0051     float m_outerRadius = 0.0f;
0052     QColor m_backgroundColor;
0053     bool m_smoothEnds = false;
0054     float m_fromAngle = 0.0;
0055     float m_toAngle = 6.28318; // 2 * pi
0056
0057     QList<QVector2D> m_segments;
0058     QList<QVector4D> m_colors;
0059 };
0060
0061 class PieChartShader : public SDFShader
0062 {
0063 public:
0064     PieChartShader();
0065     ~PieChartShader();
0066
0067     bool updateUniformData(QSGMaterialShader::RenderState &state, QSGMaterial *newMaterial, QSGMaterial *oldMaterial) override;
0068 };
0069
0070 #endif // PIECHARTMATERIAL_H