Interface IRenderer

Begin a new frame - call this before any drawing operations 开始新帧 - 在任何绘制操作之前调用

Clear the current render target 清除当前渲染目标

Dispose of renderer resources 释放渲染器资源

Draw a circle at the specified center with given radius 在指定中心绘制给定半径的圆

Draw an ellipse within the specified bounds 在指定边界内绘制椭圆

Draw a line between two points 在两点之间绘制线条

Draw a polygon defined by vertices 绘制由顶点定义的多边形

Draw a rectangle with the specified bounds 绘制指定边界的矩形

Draw text at the specified position 在指定位置绘制文本

Draw a texture at the specified position 在指定位置绘制纹理

Draw a portion of a texture (sprite from atlas) 绘制纹理的一部分（从图集中的精灵）

End the current frame and present to screen 结束当前帧并呈现到屏幕

Get the current combined transform 获取当前组合变换

Get renderer information 获取渲染器信息

Get the current render state 获取当前渲染状态

Get the current render target 获取当前渲染目标

Get rendering statistics for the current frame 获取当前帧的渲染统计信息

Get the current viewport 获取当前视口

Measure text dimensions without drawing 测量文本尺寸而不绘制

Pop render state from stack 从栈弹出渲染状态

Pop the last transform from the transform stack 从变换栈弹出最后一个变换

Push current render state onto stack 将当前渲染状态推入栈

Push a transform onto the transform stack 将变换推入变换栈

Reset statistics counters 重置统计计数器

Set the current render state 设置当前渲染状态

Set the render target (null for screen) 设置渲染目标（null表示屏幕）

Set the view matrix for camera transformation 设置用于相机变换的视图矩阵

Set the viewport for rendering 设置渲染视口

Check if the renderer supports a specific feature 检查渲染器是否支持特定功能