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DrawersPanel
The Drawers Panel contains the Shape Drawers.
The Select button triggers a Select Drawer for selecting a Shape or a Point in the CAD canvas.
When a Shape is selected, the configuration of the Shape is displayed in the Properties Panel.
When a Point associated with a Shape is selected, then the Draw operation of the Shape is initiated. The Draw operation is considered an ongoing operation, so the start point of the Shape will be kept in place, and the Shape Drawer will proceed from the second status.
The Line button triggers the Line Drawer that creates a Line Shape in the CAD Canvas. A Line consists of the start coordinates (startX, startY), and the end coordinates (endX, endY). The Line Drawer creates also a Point (circle) with the center in the start coordinates of the Line, and a Point (circle) with the center in the end coordinates of the Line.
Hold down the Shift button during the drawing of the Line in order to create a straight Line.
The Curve button triggers the Curve Drawer that creates a Curve Shape in the CAD Canvas. A Curve consists of the start coordinates (startX, startY), the control coordinates (controlX, controlY), and the end coordinates (endX, endY). The Curve Drawer creates also a Point (circle) with the center in the start coordinates of the Curve, and a Point (circle) with the center in the end coordinates of the Curve.