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 "Actor.h"
#include "../renderer/RenderTarget.h"

#ifdef DrawText
#	undef DrawText
#endif

namespace kiwano
{
	// »­²¼
	class KGE_API Canvas
		: public Actor
	{
	public:
		Canvas();

		virtual ~Canvas();

		// ¿ªÊ¼»æͼ
		void BeginDraw();

		// ½áÊø»æͼ
		void EndDraw();

		// »­Ö±Ïß
		void DrawLine(
			Point const& begin,
			Point const& end
		);

		// »­Ô²Ðα߿ò
		void DrawCircle(
			Point const& center,
			Float32 radius
		);

		// »­ÍÖÔ²Ðα߿ò
		void DrawEllipse(
			Point const& center,
			Vec2 const& radius
		);

		// »­¾ØÐα߿ò
		void DrawRect(
			Rect const& rect
		);

		// »­Ô²½Ç¾ØÐα߿ò
		void DrawRoundedRect(
			Rect const& rect,
			Vec2 const& radius
		);

		// Ìî³äÔ²ÐÎ
		void FillCircle(
			Point const& center,
			Float32 radius
		);

		// Ìî³äÍÖÔ²ÐÎ
		void FillEllipse(
			Point const& center,
			Vec2 const& radius
		);

		// Ìî³ä¾ØÐÎ
		void FillRect(
			Rect const& rect
		);

		// Ìî³äÔ²½Ç¾ØÐÎ
		void FillRoundedRect(
			Rect const& rect,
			Vec2 const& radius
		);

		// »­Í¼
		void DrawTexture(
			Texture const& texture,
			const Rect* src_rect = nullptr,
			const Rect* dest_rect = nullptr
		);

		// »­ÎÄ×Ö
		void DrawText(
			String const& text,		/* ÎÄ×Ö */
			Point const& point		/* ÎÄ×ÖλÖà */
		);

		// ¿ªÊ¼»æÖÆ·¾¶
		void BeginPath(
			Point const& begin_pos	/* ·¾¶Æðʼµã */
		);

		// ½áÊø·¾¶
		void EndPath(
			bool closed = true		/* ·¾¶ÊÇ·ñ±ÕºÏ */
		);

		// Ìí¼ÓÒ»ÌõÏ߶Î
		void AddLine(
			Point const& point		/* ¶Ëµã */
		);

		// Ìí¼Ó¶àÌõÏ߶Î
		void AddLines(
			Vector<Point> const& points
		);

		// Ìí¼ÓÒ»ÌõÈý´Î·½±´Èû¶ûÇúÏß
		void AddBezier(
			Point const& point1,	/* ±´Èû¶ûÇúÏߵĵÚÒ»¸ö¿ØÖƵã */
			Point const& point2,	/* ±´Èû¶ûÇúÏߵĵڶþ¸ö¿ØÖƵã */
			Point const& point3		/* ±´Èû¶ûÇúÏßµÄÖÕµã */
		);

		// Ìí¼Ó»¡Ïß
		void AddArc(
			Point const& point,		/* ÖÕµã */
			Point const& radius,	/* ÍÖÔ²°ë¾¶ */
			Float32 rotation,		/* ÍÖÔ²Ðýת½Ç¶È */
			bool clockwise = true,	/* ˳ʱÕë or ÄæʱÕë */
			bool is_small = true	/* ÊÇ·ñȡСÓÚ 180¡ã µÄ»¡ */
		);

		// ·¾¶Ãè±ß
		void StrokePath();

		// ·¾¶Ìî³ä
		void FillPath();

		// Çå¿Õ»­²¼
		void Clear();

		// Çå¿Õ»­²¼
		void Clear(
			Color const& clear_color
		);

		// ÉèÖÃÌî³äÑÕÉ«
		void SetFillColor(
			Color const& color
		);

		// ÉèÖÃÏßÌõÑÕÉ«
		void SetStrokeColor(
			Color const& color
		);

		// ÉèÖÃÏßÌõ¿í¶È
		void SetStrokeWidth(
			Float32 width
		);

		// ÉèÖÃÏßÌõÑùʽ
		void SetStrokeStyle(
			StrokeStyle stroke_style
		);

		// ÉèÖÃÎÄ×Ö×ÖÌå
		void SetTextFont(
			Font const& font
		);

		// ÉèÖÃÎÄ×Ö»­Ë¢Ñùʽ
		void SetTextStyle(
			TextStyle const& text_style
		);

		// ÉèÖû­±Ê͸Ã÷¶È
		void SetBrushOpacity(
			Float32 opacity
		);

		// »­±Ê¶þά±ä»»
		void SetBrushTransform(
			Transform const& transform
		);

		// »­±Ê¶þά±ä»»
		void SetBrushTransform(
			Matrix3x2 const& transform
		);

		// ÉèÖÃͼ²ã
		void PushLayerArea(
			LayerArea& area
		);

		// µ¯³öͼ²ã
		void PopLayerArea();

		// ÉèÖòüôÇøÓò
		void PushClipRect(
			Rect const& clip_rect
		);

		// µ¯³ö²Ã¼ôÇøÓò
		void PopClipRect();

		// »ñÈ¡Ìî³äÑÕÉ«
		Color GetFillColor() const;

		// »ñÈ¡ÏßÌõÑÕÉ«
		Color GetStrokeColor() const;

		// »ñÈ¡ÏßÌõ¿í¶È
		Float32 GetStrokeWidth() const;

		// »ñÈ¡»­±Ê͸Ã÷¶È
		Float32 GetBrushOpacity() const;

		// µ¼³öΪͼƬ
		Texture ExportToTexture() const;

		void OnRender(RenderTarget* rt) override;

	protected:
		void UpdateCache() const;

	protected:
		Float32				stroke_width_;
		Color				fill_color_;
		Color				stroke_color_;
		Font				text_font_;
		TextStyle			text_style_;
		StrokeStyle			stroke_style_;
		GeometrySink		geo_sink_;
		TextureRenderTarget	rt_;

		mutable bool		cache_expired_;
		mutable Texture		texture_cached_;
	};
}