QT simple clock class
2017-12-29
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5 comprehensive programming: visual clock 5.1 demonstration case [task objective] realizes the visual clock effect as shown in the figure, and the clock pointer is updated timely. The whole dial is required to be the largest inscribed circle of the rectangle in the client area, which changes adaptively with the size of the window, and the size of the pointer can also change accordingly. Design dialog box, allow users to set the color of dial, scale and pointer, and display the preview effect of clock in the dialog box. [analysis and design] the simplest design can be adopted. After the program starts, trigger the timer message, refresh the window display in the timer event processing method, and draw the visual clock in the paintevent method. This design scheme is more complex, and the code of drawing hour hand, minute hand and second hand is more complex and redundant. The code of paintevent can only be drawn in the form. If you want to draw in other places (such as the preview effect in the dialog box), the whole processing logic is difficult to reuse. The whole clock consists of a dial and three pointers, each of which has different processing logic. The dial processing and drawing are encapsulated in the plate class. The processing logic of the three pointers is similar, abstracting arm
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