Hold Shift and drag to draw a perfect circle.
按住Shift键并拖动以绘制一个完美的圆形。
Tap your finger to create a spark, drag one finger to draw a line of electricity, two to play an arpeggio and more than two for more complex arpeggios.
手指触及屏幕可以制造火光，手指拖拽可以画一条闪电，两指可以弹琶音，多指可以演奏复杂的琶音。
To draw a measurement line, click the New line button and then click and drag in the main image window with the left mouse button to place the start and end points of the line.
画一个测量线，单击新行按钮，然后单击并拖动在主图像窗口用鼠标左键将开始和结束点的线。
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