[School_ĐHMT] Real-world coordinate system, coordinate systems and equipment, coordinate system standard equipment

December 6, 2013 nguyenvanquan7826 School Computer Graphics 1 response



1. Real-world coordinate system (WCS: World Coordinate System)

Content
Real-world coordinate system
Coordinate systems and equipment
Standard coordinate system

– Real-world coordinate system is a coordinate system describes the objects in the real world
– Real common coordinate system is the Cartesian coordinate system. The point in the plane is represented by coordinates (x, and) with x, y of R, the origin point O(0, 0), Ox and Oy is the horizontal axis and vertical axis, x and y is the x coordinate and y-coordinate.
– The coordinate system that allows the use of arbitrary size (cm, km, nm, …)

coordinates implementation

2. Coordinate systems and equipment (DCS: Device Coordinate System)

– Coordinate system is a coordinate system equipment to perform the object of each specific output device (printer, Screen, …).
– The point is represented by a pair of coordinates (x, and) with x and y of N. The coordinates of the point made repeatedly expressed also in device coordinates are shown as they're discrete integers.
– Limit of coordinates (x, and) depending on the specific device.

3. Coordinate system is standard equipment (Normalized device coordinates)

– Since each unit has its own coordinate system, so the image is displayed well in every device that can not, Therefore we make the coordinate system represents the standard equipment for all devices that display images are not dependent on any device.
– In the standard coordinate system, pairs of coordinates (x, and) will be valuable in paragraph [0, 1]. Thus the spatial coordinates of the lower left is a standard point (0, 0), on the right is (1, 1).
coordinate system standard equipment