kicad/include/preview_items/draw_context.h

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2017 Kicad Developers, see change_log.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef PREVIEW_PREVIEW_DRAW_CONTEXT__H_
#define PREVIEW_PREVIEW_DRAW_CONTEXT__H_
#include <painter.h>
namespace KIGFX
{
class GAL;
class VIEW;
namespace PREVIEW
{
/**
* A KIGFX::PREVIEW::DRAW_CONTEXT is a wrapper around a GAL and some other
* settings that makes it easy to draw preview items consistently.
*
* This class provides some graphical items that are often used by preview
* items. Complex items can be composed from these.
*/
class DRAW_CONTEXT
{
public:
DRAW_CONTEXT( KIGFX::VIEW& aView );
/**
* Draw a preview circle on the current layer
*
* @param aOrigin circle origin
* @param aRad circle radius
* @param aDeEmphasised draw the circle de-emphasised
*/
void DrawCircle( const VECTOR2I& aOrigin, double aRad, bool aDeEmphasised );
/**
* Draw a simple line on the current layer.
*
* @param aStart line start point
* @param aEnd line end point
* @param aDeEmphasised draw the line de-emphasised
*/
void DrawLine( const VECTOR2I& aStart, const VECTOR2I& aEnd, bool aDeEmphasised );
/**
* Draw a straight line on the current layer, with a special highlight when
* the line angle is a multiple of 45 degrees.
*
* @param aStart line start point
* @param aEnd line end point
* @param aDeEmphasised draw the line de-emphasised
*/
void DrawLineWithAngleHighlight(
const VECTOR2I& aStart, const VECTOR2I& aEnd, bool aDeEmphasised );
/**
* Draw an arc on the current layer, with a special highlight when
* the line angle is a multiple of 45 degrees.
*
* @param aOrigin the arc centre
* @param aRad the arc radius
* @param aStartAngle the arc start angle
* @param aEndAngle the arc end angle
*/
void DrawArcWithAngleHighlight(
const VECTOR2I& aOrigin, double aRad, double aStartAngle, double aEndAngle );
private:
/**
* @return the colour to use for "special" angles
*/
COLOR4D getSpecialAngleColour() const;
///< The GAL to draw into
KIGFX::GAL& m_gal;
const KIGFX::RENDER_SETTINGS& m_render_settings;
///< The current layer to draw onto
GAL_LAYER_ID m_currLayer;
/// The line width to use for items
float m_lineWidth;
};
} // namespace PREVIEW
} // namespace KIGFX
#endif // PREVIEW_PREVIEW_DRAW_CONTEXT__H_