Magic_Game/src/kiwano/2d/Canvas.h

// Copyright (c) 2016-2018 Kiwano - Nomango
// 
// 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.

#pragma once
#include <kiwano/2d/Actor.h>
#include <kiwano/renderer/RenderTarget.h>

#ifdef DrawText
#	undef DrawText
#endif

namespace kiwano
{
	// <20><><EFBFBD><EFBFBD>
	class KGE_API Canvas
		: public Actor
	{
	public:
		Canvas();

		virtual ~Canvas();

		// <20><>ʼ<EFBFBD><CABC>ͼ
		void BeginDraw();

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͼ
		void EndDraw();

		// <20><>ֱ<EFBFBD><D6B1>
		void DrawLine(
			Point const& begin,
			Point const& end
		);

		// <20><>Բ<EFBFBD>α߿<CEB1>
		void DrawCircle(
			Point const& center,
			float radius
		);

		// <20><><EFBFBD><EFBFBD>Բ<EFBFBD>α߿<CEB1>
		void DrawEllipse(
			Point const& center,
			Vec2 const& radius
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD>α߿<CEB1>
		void DrawRect(
			Rect const& rect
		);

		// <20><>Բ<EFBFBD>Ǿ<EFBFBD><C7BE>α߿<CEB1>
		void DrawRoundedRect(
			Rect const& rect,
			Vec2 const& radius
		);

		// <20><><EFBFBD><EFBFBD>Բ<EFBFBD><D4B2>
		void FillCircle(
			Point const& center,
			float radius
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Բ<EFBFBD><D4B2>
		void FillEllipse(
			Point const& center,
			Vec2 const& radius
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void FillRect(
			Rect const& rect
		);

		// <20><><EFBFBD><EFBFBD>Բ<EFBFBD>Ǿ<EFBFBD><C7BE><EFBFBD>
		void FillRoundedRect(
			Rect const& rect,
			Vec2 const& radius
		);

		// <20><>ͼ
		void DrawTexture(
			Texture const& texture,
			const Rect* src_rect = nullptr,
			const Rect* dest_rect = nullptr
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void DrawText(
			String const& text,		/* <20><><EFBFBD><EFBFBD> */
			Point const& point		/* <20><><EFBFBD><EFBFBD>λ<EFBFBD><CEBB> */
		);

		// <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>·<EFBFBD><C2B7>
		void BeginPath(
			Point const& begin_pos	/* ·<><C2B7><EFBFBD><EFBFBD>ʼ<EFBFBD><CABC> */
		);

		// <20><><EFBFBD><EFBFBD>·<EFBFBD><C2B7>
		void EndPath(
			bool closed = true		/* ·<><C2B7><EFBFBD>Ƿ<EFBFBD><C7B7>պ<EFBFBD> */
		);

		// <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>߶<EFBFBD>
		void AddLine(
			Point const& point		/* <20>˵<EFBFBD> */
		);

		// <20><><EFBFBD>Ӷ<EFBFBD><D3B6><EFBFBD><EFBFBD>߶<EFBFBD>
		void AddLines(
			Vector<Point> const& points
		);

		// <20><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>η<EFBFBD><CEB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void AddBezier(
			Point const& point1,	/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ߵĵ<DFB5>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD> */
			Point const& point2,	/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ߵĵڶ<C4B5><DAB6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD> */
			Point const& point3		/* <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ߵ<EFBFBD><DFB5>յ<EFBFBD> */
		);

		// <20><><EFBFBD>ӻ<EFBFBD><D3BB><EFBFBD>
		void AddArc(
			Point const& point,		/* <20>յ<EFBFBD> */
			Point const& radius,	/* <20><>Բ<EFBFBD>뾶 */
			float rotation,		/* <20><>Բ<EFBFBD><D4B2>ת<EFBFBD>Ƕ<EFBFBD> */
			bool clockwise = true,	/* ˳ʱ<CBB3><CAB1> or <20><>ʱ<EFBFBD><CAB1> */
			bool is_small = true	/* <20>Ƿ<EFBFBD>ȡС<C8A1><D0A1> 180<38><30> <20>Ļ<EFBFBD> */
		);

		// ·<><C2B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void StrokePath();

		// ·<><C2B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void FillPath();

		// <20><><EFBFBD>ջ<EFBFBD><D5BB><EFBFBD>
		void Clear();

		// <20><><EFBFBD>ջ<EFBFBD><D5BB><EFBFBD>
		void Clear(
			Color const& clear_color
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɫ
		void SetFillColor(
			Color const& color
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɫ
		void SetStrokeColor(
			Color const& color
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void SetStrokeWidth(
			float width
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ
		void SetStrokeStyle(
			StrokeStyle stroke_style
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		void SetTextFont(
			Font const& font
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD>ˢ<EFBFBD><CBA2>ʽ
		void SetTextStyle(
			TextStyle const& text_style
		);

		// <20><><EFBFBD>û<EFBFBD><C3BB><EFBFBD>͸<EFBFBD><CDB8><EFBFBD><EFBFBD>
		void SetBrushOpacity(
			float opacity
		);

		// <20><><EFBFBD>ʶ<EFBFBD>ά<EFBFBD>任
		void SetBrushTransform(
			Transform const& transform
		);

		// <20><><EFBFBD>ʶ<EFBFBD>ά<EFBFBD>任
		void SetBrushTransform(
			Matrix3x2 const& transform
		);

		// <20><><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC>
		void PushLayerArea(
			LayerArea& area
		);

		// <20><><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC>
		void PopLayerArea();

		// <20><><EFBFBD>òü<C3B2><C3BC><EFBFBD><EFBFBD><EFBFBD>
		void PushClipRect(
			Rect const& clip_rect
		);

		// <20><><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><C3BC><EFBFBD><EFBFBD><EFBFBD>
		void PopClipRect();

		// <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɫ
		Color GetFillColor() const;

		// <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɫ
		Color GetStrokeColor() const;

		// <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		float GetStrokeWidth() const;

		// <20><>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>͸<EFBFBD><CDB8><EFBFBD><EFBFBD>
		float GetBrushOpacity() const;

		// <20><><EFBFBD><EFBFBD>ΪͼƬ
		Texture ExportToTexture() const;

		void OnRender(RenderTarget* rt) override;

	protected:
		void UpdateCache() const;

	protected:
		float				stroke_width_;
		Color				fill_color_;
		Color				stroke_color_;
		Font				text_font_;
		TextStyle			text_style_;
		StrokeStyle			stroke_style_;
		GeometrySink		geo_sink_;

		mutable bool		cache_expired_;
		mutable Texture		texture_cached_;
		mutable TextureRenderTarget	rt_;
	};
}