The most commonly used Geometry in mapping are point, line, surface and text. The Object Operation tab provides functions for creating various Geometry types on the map, including Point Object Drawing, Line Object Drawing, Face Object Drawing, and Text Object Drawing.

The drawing of all kinds of Geometry is carried out in the state that the layer is editable. Set multiple layers to be editable at the same time. However, when creating a point, line, face or Text, the Geometry Object Drawing is carried out only for the currently selected layer. Therefore, if you want to create a new object on a layer, you must first click the corresponding layer in Layer Manager and set the Layer Settings as the current layer.

Here are some concepts involved in Object Drawing:

Object overview

Object: Geometry, the abstract representation of discrete spatial entities in GIS. An object has its own properties and behavior. In SuperMap, some objects can be created directly, while others need to be generated through transformation.

• Single Object: refers to an object. A simple object, a complex object, a Compound, and a child object are all Single Objects.
• Subobject (part): Refers to the constituent units of simple and complex objects. A simple object consists of one subobject, itself; a complex object consists of two or more subobjects.
• Simple Object: An object that has only one child, itself.
• Complex Object: An object that has two or more child objects of the same type.
• Compound (Compound Object): refers specifically to the object generated by the compound operation in the CAD layer. Compound has no concept of subobjects.
• Parametric object: Geometry is drawn through the main parameters and is continuous. Normal Geometry is drawn with the coordinates of the keys or strings of points that make up the object. For example, the Parametric Circle is accurately drawn by determining the two parameters of the center and radius of the circle, while the ordinary circle discretizes the arc of the circle to remove the points, and then connects these points into a line to form a closed circle.

Angle description in Object Drawing

• Angle direction: the angle direction involved in the Application is counterclockwise.
• Start Angle: The Start Angle in the drawing object refers to the angle between the starting edge in the north direction and the other edge.

Parametric Drawing Description

In the process of drawing some objects, directly inputting the coordinates, length, angle and other parameters of the drawing object can make the drawing process more convenient. On the Object Operation tab, in the Object Drawing group, click the Parametric Drawing button or use the Shift + P shortcut to enable Parametric Drawing.

• Input coordinate value: draw points, straight lines, polylines, curves, circles, polygons, etc. Through coordinate point parameters, including coordinates such as the starting point, midpoint, turning point, and end point of the object.
• Input length value: draw straight line, polyline, polygon, sector, circle, arc, etc. By inputting object length parameter, including limit length, side length, radius, diameter, etc.
• Enter an angle value: Draw the object by entering an angle value, which determines the draw object direction and Start Angle.

Instructions for use of the Shift key

In the process of drawing some objects, the use of the Shift key can make the drawing process more convenient.

• Draw a straight line: When drawing a straight line by entering the length and angle parameters, you can only draw a straight line in the horizontal, vertical or 45 ° direction by holding down the Shift key.
• Draw Rectangle (Rounded Rectangle): When drawing a rectangle by entering the width and height parameters, hold down the Shift key to get a square with the same width and height.
• Draw an ellipse: Hold down the Shift key while drawing the Inscribed Ellipse, and you will get a perfect circle with equal width and height.

Instructions for use of the key

When drawing objects in the map, press the letter A key in the keyboard to switch the mouse in the current Map to the drawing roaming state, and the state of the mouse in Current Windows is .

After the mouse is switched to the drawing roaming state during object drawing, you can switch the mouse state to the drawing state in the following three ways to continue drawing objects:

• Press the A key again to switch;
• Click right mouse button to switch;
• Press the Esc key on the keyboard to switch.

Instructions for use of the Q key

When drawing a line or surface object in the map, press the Q key in the keyboard to enable the adsorption function. When Move Stop by Mouse to the boundary of an existing object, it will be automatically adsorbed on the boundary to avoid Topology error.

• Press the Q key for the first time to start the adsorption function;
• Press the Q key again to close the adsorption function;