Add initial prototype.

3-mid/physics/implement/box2d/contrib/include/box2d/b2_draw.h

@@ -0,0 +1,102 @@
+// MIT License
+
+// Copyright (c) 2019 Erin Catto
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#ifndef B2_DRAW_H
+#define B2_DRAW_H
+
+#include "b2_api.h"
+#include "b2_math.h"
+
+/// Color for debug drawing. Each value has the range [0,1].
+struct B2_API b2Color
+{
+	b2Color() {}
+	b2Color(float rIn, float gIn, float bIn, float aIn = 1.0f)
+	{
+		r = rIn; g = gIn; b = bIn; a = aIn;
+	}
+
+	void Set(float rIn, float gIn, float bIn, float aIn = 1.0f)
+	{
+		r = rIn; g = gIn; b = bIn; a = aIn;
+	}
+
+	float r, g, b, a;
+};
+
+/// Implement and register this class with a b2World to provide debug drawing of physics
+/// entities in your game.
+class B2_API b2Draw
+{
+public:
+	b2Draw();
+
+	virtual ~b2Draw() {}
+
+	enum
+	{
+		e_shapeBit				= 0x0001,	///< draw shapes
+		e_jointBit				= 0x0002,	///< draw joint connections
+		e_aabbBit				= 0x0004,	///< draw axis aligned bounding boxes
+		e_pairBit				= 0x0008,	///< draw broad-phase pairs
+		e_centerOfMassBit		= 0x0010	///< draw center of mass frame
+	};
+
+	/// Set the drawing flags.
+	void SetFlags(uint32 flags);
+
+	/// Get the drawing flags.
+	uint32 GetFlags() const;
+
+	/// Append flags to the current flags.
+	void AppendFlags(uint32 flags);
+
+	/// Clear flags from the current flags.
+	void ClearFlags(uint32 flags);
+
+	/// Draw a closed polygon provided in CCW order.
+	virtual void DrawPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color) = 0;
+
+	/// Draw a solid closed polygon provided in CCW order.
+	virtual void DrawSolidPolygon(const b2Vec2* vertices, int32 vertexCount, const b2Color& color) = 0;
+
+	/// Draw a circle.
+	virtual void DrawCircle(const b2Vec2& center, float radius, const b2Color& color) = 0;
+
+	/// Draw a solid circle.
+	virtual void DrawSolidCircle(const b2Vec2& center, float radius, const b2Vec2& axis, const b2Color& color) = 0;
+
+	/// Draw a line segment.
+	virtual void DrawSegment(const b2Vec2& p1, const b2Vec2& p2, const b2Color& color) = 0;
+
+	/// Draw a transform. Choose your own length scale.
+	/// @param xf a transform.
+	virtual void DrawTransform(const b2Transform& xf) = 0;
+
+	/// Draw a point.
+	virtual void DrawPoint(const b2Vec2& p, float size, const b2Color& color) = 0;
+
+protected:
+	uint32 m_drawFlags;
+};
+
+#endif