程序除实现三次Bezier曲线的绘制，还实现了点，直线，圆的绘制，可做为学习计算机图形算法的参考。
In addition to procedures to achieve cubic Bezier curve drawing, but also realized the point, line, round mapping, can be used as learning computer graphics algorithm reference.
这里绘制了一个矩形、一个透明的圆和一个三角形。
Here a simple square is drawn, with a transparent circle and triangle.
添加代码以在图像的50x, 50y位置绘制一个蓝色圆。
Add the code to draw a blue circle on the image at position 50x, 50y.
这个按钮的形状并不是一个真正的圆，因此你要使用钢笔工具来绘制它。
The shape of the button is not perfectly circular, so you will have to use the Pen Tool to draw it.
我们将使用这个代码对线、圆和位图的物理绘制进行抽象。
We will use this code to abstract away the physical drawing of lines, circles, and bitmaps.
用最明显的图形来描述这个过渡的特性就是：当在两个圆之间绘制一条直线，直线与每个圆只有一个交点时，那么这条线就是两个圆的切线。
The quality of this transition is best visualized by a straight line drawn between two circles: the line's only point of contact with each circle is tangential.
对于第一个简单效果，将在视频流中的固定位置绘制一个阿尔法混合(半透明的)圆。
For our first simple effect, we will draw an alpha-blended (semitransparent) circle at a fixed position over the video stream. The first step is to add the drawing functions to the screen.c.
这部分的下面一行指定了要绘制在星图上最小恒星圆的尺寸。
The bottom line of the section specifies the size of the smallest star circle which will be displayed on the map.
圆花窗，圆花饰：一种绘制或雕刻成的装饰品，从中心向四周成辐射状伸展并使人联想起玫瑰花的花萼。
Architecture A painted, carved, or sculptured ornament having a circular arrangement of parts radiating out from the center and suggesting the petals of a rose.
在图形的绘制模块中又可以分成七个小的模块：直线、虚线、圆和圆弧、椭圆及椭圆弧、样条曲线。
Drawing module is divided into seven small modules: dash, line, rectangle, circle, arc, ellipse and bezier.
同时还利用计算机图形学原理，对管件外圆表面直线段、弯曲段的三维绘制进行处理分析。
Meanwhile, the drawing regulations about line segments and curly segments of tube bending surface are analysed.
同时还利用计算机图形学原理，对管件外圆表面直线段、弯曲段的三维绘制进行处理分析。
Meanwhile, the drawing regulations about line segments and curly segments of tube bending surface are analysed.
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