Initial release

engine/vendor/vst3sdk/vstgui4/vstgui/lib/cgraphicstransform.h

@@ -0,0 +1,154 @@
+// This file is part of VSTGUI. It is subject to the license terms 
+// in the LICENSE file found in the top-level directory of this
+// distribution and at http://github.com/steinbergmedia/vstgui/LICENSE
+
+#pragma once
+
+#include "cpoint.h"
+#include "crect.h"
+
+#ifndef M_PI
+#define M_PI        3.14159265358979323846264338327950288
+#endif
+
+namespace VSTGUI {
+
+static inline double radians (double degrees) { return degrees * M_PI / 180; }
+
+//-----------------------------------------------------------------------------
+/// @brief Graphics Transform Matrix
+/// @ingroup new_in_4_0
+//-----------------------------------------------------------------------------
+struct CGraphicsTransform
+{
+	double m11 {1.};
+	double m12 {0.};
+	double m21 {0.};
+	double m22 {1.};
+	double dx {0.};
+	double dy {0.};
+	
+	CGraphicsTransform () = default;
+	CGraphicsTransform (double _m11, double _m12, double _m21, double _m22, double _dx, double _dy)
+	: m11 (_m11), m12 (_m12), m21 (_m21), m22 (_m22), dx (_dx), dy (_dy)
+	{}
+	
+	CGraphicsTransform& translate (double x, double y)
+	{
+		*this = CGraphicsTransform (1, 0, 0, 1, x, y) * this;
+		return *this;
+	}
+	
+	CGraphicsTransform& translate (const CPoint& p)
+	{
+		return translate (p.x, p.y);
+	}
+	
+	CGraphicsTransform& scale (double x, double y)
+	{
+		*this = CGraphicsTransform (x, 0., 0., y, 0., 0.) * this;
+		return *this;
+	}
+
+	CGraphicsTransform& scale (const CPoint& p)
+	{
+		return scale (p.x, p.y);
+	}
+	
+	CGraphicsTransform& rotate (double angle)
+	{
+		angle = radians (angle);
+		*this = CGraphicsTransform (cos (angle), -sin (angle), sin (angle), cos (angle), 0, 0) * this;
+		return *this;
+	}
+
+	CGraphicsTransform& rotate (double angle, const CPoint& center)
+	{
+		return translate (-center.x, -center.y).rotate (angle).translate (center.x, center.y);
+	}
+
+	CGraphicsTransform& skewX (double angle)
+	{
+		*this = CGraphicsTransform (1, std::tan (radians (angle)), 0, 1, 0, 0) * *this;
+		return *this;
+	}
+
+	CGraphicsTransform& skewY (double angle)
+	{
+		*this = CGraphicsTransform (1, 0, std::tan (radians (angle)), 1, 0, 0) * *this;
+		return *this;
+	}
+	
+	bool isInvariant () const
+	{
+		return *this == CGraphicsTransform ();
+	}
+
+	void transform (CCoord& x, CCoord& y) const
+	{
+		CCoord x2 = m11*x + m12*y + dx;
+		CCoord y2 = m21*x + m22*y + dy;
+		x = x2;
+		y = y2;
+	}
+		
+	void transform (CCoord& left, CCoord& right, CCoord& top, CCoord& bottom) const
+	{
+		transform (left, top);
+		transform (right, bottom);
+	}
+	
+	CPoint& transform (CPoint& p) const
+	{
+		transform (p.x, p.y);
+		return p;
+	}
+
+	CRect& transform (CRect& r) const
+	{
+		transform (r.left, r.right, r.top, r.bottom);
+		return r;
+	}
+
+	CGraphicsTransform inverse () const
+	{
+		CGraphicsTransform result;
+		const double denominator = m11 * m22 - m12 * m21;
+		if (denominator != 0)
+		{
+			result.m11 = m22 / denominator;
+			result.m12 = -m12 / denominator;
+			result.m21 = -m21 / denominator;
+			result.m22 = m11 / denominator;
+			result.dx = ((m12 * dy) - (m22 * dx)) / denominator;
+			result.dy = ((m21 * dx) - (m11 * dy)) / denominator;
+		}
+		return result;
+	}
+
+	CGraphicsTransform operator* (const CGraphicsTransform& t) const
+	{
+		CGraphicsTransform result;
+		result.m11 = (m11 * t.m11) + (m12 * t.m21);
+		result.m21 = (m21 * t.m11) + (m22 * t.m21);
+		result.dx = (m11 * t.dx) + (m12 * t.dy) + dx;
+		result.m12 = (m11 * t.m12) + (m12 * t.m22);
+		result.m22 = (m21 * t.m12) + (m22 * t.m22);
+		result.dy = (m21 * t.dx) + (m22 * t.dy) + dy;
+		return result;
+	}
+	
+	CGraphicsTransform operator* (const CGraphicsTransform* t) const { return *this * *t; }
+
+	bool operator== (const CGraphicsTransform& t) const
+	{
+		return m11 == t.m11 && m12 == t.m12 && m21 == t.m21 && m22 == t.m22 && dx == t.dx && dy == t.dy;
+	}
+
+	bool operator!= (const CGraphicsTransform& t) const
+	{
+		return m11 != t.m11 || m12 != t.m12 || m21 != t.m21 || m22 != t.m22 || dx != t.dx || dy != t.dy;
+	}
+};
+
+} // VSTGUI