Beginners Qt learning (Basic Operation)

Qt base class

QWidget: common base class, blank window
QMainWindow: on the basis of QWidget adds some features
QDialog

Common tools like Qt

1. QPainter
   basic class painter

QPainter p(this);			定义一个画家

QPen
　　brush class

//可以定义画笔并设置笔的颜色和粗细
QPen pen;
pen.setColor("blue");
p.setPen(pen);

2. QLabel
   label class
3. QPropertyAnimation
   basic animation classes: to make the control (e.g., label) to move, to change the rotation to achieve transparency change, gradients, size of the location
4. QSequentialAnimation
   Animation classes, continuous animation
5. QImage
   pictures class, used to define the picture object

Function signals and slots

扩展：
	（C++标准）父类的指针可以指向子类的对象，反过来不可以
	子类的

Animation

Timer