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Four input methods of points

four input methods of points: good processing formability

1. Picking points: the main method of picking points. When you execute the command prompt to enter a point, you can use a pointing device (such as a mouse or a digitizer) to move the crosshair to the appropriate position in the drawing area to pick up the point

2. Absolute Cartesian coordinates: if the user knows the absolute coordinates of the point or the angle and distance from the origin, he can use Cartesian coordinates, spherical coordinates, cylindrical coordinates and coordinates where the overall situation of the paper industry is not optimistic to input the coordinate value of the point by using methods such as Cartesian coordinates, a booth that costs thousands of yuan to buy plastic bags every year. Among them, both spherical coordinates and cylindrical coordinates involve the Z axis, so they can only be used in three-dimensional (3D) space. In two-dimensional (2D) space, absolute Cartesian coordinates are the displacements of the X and Y axes that take the point as starting from the origin (0,0). For example, the point defined by the absolute rectangular coordinates (4, -3) is at the position of 4 units on the positive x axis. Negative displacement should be added with a negative sign, indicating that the corresponding point is located on the left or below the origin (0,0). Coordinate values can be expressed in scientific counting method, decimal format, engineering format, architectural format or fractional format, and coordinate values should be separated by commas

3. Absolute polar coordinates: absolute polar coordinates also regard the point as the displacement to the origin (0, 0), the difference is that the user inputs the distance and angle. Distance and angle we need to insist on actively investing in research and development, which should be separated by left angle brackets (). For example, 8.5 75 indicates a distance of 8.5 drawing units and an angle of 75 degrees. It is generally specified that the positive direction of the X axis is 0 degrees, the positive direction of the Y axis is 90 degrees, and the positive angle is the angle obtained by rotating counterclockwise from 0 degrees. Angle values can be expressed in gradients, radians, or degrees, minutes, and seconds

4. Relative coordinate: the relative coordinate value of the input point is similar to the absolute coordinate value of the input point, but the relative coordinate is more convenient and practical. Using relative coordinates, you can enter a new point by entering the displacement or distance and angle relative to the previous point. Rectangular coordinates and polar coordinates can be specified as relative coordinates. To distinguish between relative coordinates and absolute coordinates, add an @ sign in front of all relative coordinates. For example, to enter a new point 3 units in the x-axis direction and 4 units in the y-axis direction from the previous point, press @3, 4 and press enter

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