实现文字自动折行，并根据高度和宽度自动计算可以显示的文字数，如果一次显示不开，则等待按键后继续显示，直至全部显示。可用于rpg游戏中的对话功能。-Text automatically wrap to achieve, and automatic calculation based on height and width of the text can be displayed, and if a show does not open, then after waiting for keys continues to display until all the display. Rpg game for the dialogue functions.