280 lines
6.8 KiB
C++
280 lines
6.8 KiB
C++
// Copyright (c) 2016-2018 Kiwano - Nomango
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#pragma once
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#include <kiwano/2d/Actor.h>
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#include <kiwano/renderer/RenderTarget.h>
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namespace kiwano
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{
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KGE_DECLARE_SMART_PTR(Canvas);
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/**
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* \addtogroup Actors
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* @{
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*/
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/**
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* \~chinese
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* @brief 画布，用于绘制图元
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*/
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class KGE_API Canvas
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: public Actor
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{
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public:
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/// \~chinese
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/// @brief 构建空画布
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Canvas();
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virtual ~Canvas();
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/// \~chinese
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/// @brief 开始绘图
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void BeginDraw();
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/// \~chinese
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/// @brief 结束绘图
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void EndDraw();
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/// \~chinese
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/// @brief 画线段
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/// @param begin 线段起点
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/// @param end 线段终点
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void DrawLine(Point const& begin, Point const& end);
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/// \~chinese
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/// @brief 画圆形边框
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/// @param center 圆形原点
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/// @param radius 圆形半径
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void DrawCircle(Point const& center, float radius);
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/// \~chinese
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/// @brief 画椭圆形边框
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/// @param center 椭圆原点
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/// @param radius 椭圆半径
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void DrawEllipse(Point const& center, Vec2 const& radius);
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/// \~chinese
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/// @brief 画矩形边框
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/// @param rect 矩形
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void DrawRect(Rect const& rect);
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/// \~chinese
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/// @brief 画圆角矩形边框
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/// @param rect 矩形
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/// @param radius 矩形圆角半径
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void DrawRoundedRect(Rect const& rect, Vec2 const& radius);
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/// \~chinese
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/// @brief 填充圆形
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/// @param center 圆形原点
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/// @param radius 圆形半径
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void FillCircle(Point const& center, float radius);
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/// \~chinese
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/// @brief 填充椭圆形
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/// @param center 椭圆原点
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/// @param radius 椭圆半径
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void FillEllipse(Point const& center, Vec2 const& radius);
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/// \~chinese
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/// @brief 填充矩形
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/// @param rect 矩形
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void FillRect(Rect const& rect);
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/// \~chinese
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/// @brief 填充圆角矩形
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/// @param rect 矩形
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/// @param radius 矩形圆角半径
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void FillRoundedRect(Rect const& rect, Vec2 const& radius);
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/// \~chinese
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/// @brief 绘制纹理
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/// @param texture 纹理
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/// @param src_rect 纹理裁剪区域
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/// @param dest_rect 绘制目标区域
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void DrawTexture(TexturePtr texture, const Rect* src_rect = nullptr, const Rect* dest_rect = nullptr);
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/// \~chinese
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/// @brief 绘制文字布局
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/// @param text 文字
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/// @param point 绘制文字的位置
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void DrawTextLayout(String const& text, Point const& point);
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/// \~chinese
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/// @brief 绘制文字布局
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/// @param layout 文字布局
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/// @param point 绘制布局的位置
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void DrawTextLayout(TextLayout const& layout, Point const& point);
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/// \~chinese
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/// @brief 开始绘制路径
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/// @param begin_pos 路径起始点
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void BeginPath(Point const& begin_pos);
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/// \~chinese
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/// @brief 结束路径
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/// @param closed 路径是否闭合
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void EndPath(bool closed = true);
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/// \~chinese
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/// @brief 添加一条线段
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/// @param point 端点
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void AddLine(Point const& point);
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/// \~chinese
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/// @brief 添加多条线段
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/// @param points 端点集合
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void AddLines(Vector<Point> const& points);
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/// \~chinese
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/// @brief 添加一条三次方贝塞尔曲线
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/// @param point1 贝塞尔曲线的第一个控制点
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/// @param point2 贝塞尔曲线的第二个控制点
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/// @param point3 贝塞尔曲线的终点
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void AddBezier(Point const& point1, Point const& point2, Point const& point3);
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/// \~chinese
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/// @brief 添加弧线
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/// @param point 终点
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/// @param radius 椭圆半径
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/// @param rotation 椭圆旋转角度
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/// @param clockwise 顺时针 or 逆时针
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/// @param is_small 是否取小于 180° 的弧
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void AddArc(Point const& point, Size const& radius, float rotation, bool clockwise = true, bool is_small = true);
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/// \~chinese
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/// @brief 以描边的方式绘制路径
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void StrokePath();
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/// \~chinese
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/// @brief 以填充的方式绘制路径
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void FillPath();
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/// \~chinese
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/// @brief 清空画布
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void Clear();
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/// \~chinese
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/// @brief 清空画布
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/// @param clear_color 清空颜色
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void Clear(Color const& clear_color);
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/// \~chinese
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/// @brief 设置填充颜色
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/// @param color 填充颜色
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void SetFillColor(Color const& color);
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/// \~chinese
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/// @brief 设置轮廓颜色
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/// @param color 轮廓颜色
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void SetStrokeColor(Color const& color);
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/// \~chinese
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/// @brief 设置轮廓宽度
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/// @param width 轮廓宽度
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void SetStrokeWidth(float width);
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/// \~chinese
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/// @brief 设置轮廓样式
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/// @param stroke_style 轮廓样式
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void SetStrokeStyle(StrokeStyle stroke_style);
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/// \~chinese
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/// @brief 设置文字画刷样式
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/// @param text_style 文字画刷样式
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void SetTextStyle(TextStyle const& text_style);
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/// \~chinese
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/// @brief 设置画笔透明度
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/// @param opacity 透明度，范围 [0.0 - 1.0]
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void SetBrushOpacity(float opacity);
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/// \~chinese
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/// @brief 设置画笔二维变换
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/// @param transform 二维变换
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void SetBrushTransform(Transform const& transform);
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/// \~chinese
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/// @brief 设置画笔二维变换矩阵
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/// @param transform 二维变换矩阵
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void SetBrushTransform(Matrix3x2 const& transform);
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/// \~chinese
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/// @brief 添加一个图层
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/// @param area 图层区域
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void PushLayerArea(LayerArea& area);
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/// \~chinese
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/// @brief 删除最近添加的图层
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void PopLayerArea();
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/// \~chinese
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/// @brief 添加一个裁剪区域
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/// @param clip_rect 裁剪矩形
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void PushClipRect(Rect const& clip_rect);
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/// \~chinese
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/// @brief 删除最近添加的裁剪区域
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void PopClipRect();
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/// \~chinese
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/// @brief 获取填充颜色
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Color GetFillColor() const;
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/// \~chinese
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/// @brief 获取轮廓颜色
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Color GetStrokeColor() const;
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/// \~chinese
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/// @brief 获取轮廓宽度
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float GetStrokeWidth() const;
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/// \~chinese
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/// @brief 获取画笔透明度
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float GetBrushOpacity() const;
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/// \~chinese
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/// @brief 导出纹理
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TexturePtr ExportToTexture() const;
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void OnRender(RenderTarget* rt) override;
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private:
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void UpdateCache() const;
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private:
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float stroke_width_;
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Color fill_color_;
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Color stroke_color_;
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TextStyle text_style_;
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StrokeStyle stroke_style_;
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GeometrySink geo_sink_;
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mutable bool cache_expired_;
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mutable TexturePtr texture_cached_;
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mutable TextureRenderTarget rt_;
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};
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/** @} */
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}
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