用户标注点击鼠标留下控制点，生成样条曲线 -Cardinal line

Qt编写小车运动动画：鼠标绘制路径关键点；Cardinal样条曲线插值计算，自动生成路径；小车能控制初速度和加速度，能随曲线起伏运动。-Qt write trolley motion animation: the mouse to draw a path key point Cardinal spline interpolation calculation, automatic generation path control car early speed and acceleration,