Computer Graphics Coordinate Systems

In computer graphics there are three kinds of coordinate system should be noted:
• real coordinates
• The coordinate system (Cartesian coordinates)
• Coordinate display / screen
Coordinates REAL (WORLD Coordinate)
Are the coordinates of the object at that time were concerned, eg the coordinates of a chair
depending on the location of the chair was where, how it is.
In real coordinates its implementation can be said as a WINDOW that is an area that shows the real world is seen by viewers.

Each point is drawn with a point-plotting techniques location is determined based on the Cartesian coordinate system.
Each point is determined location via paired values of x and y.
Where the value of a positive x coordinate increases from left to right and positive values of y increase from bottom to top.

Cartesian coordinate axis direction opposite to that used on a computer screen.
On the computer screen increases the positive x-axis to the right and positive y-axis increasing downward.
As in the following figure if a point on the Cartesian coordinates were redrawn to the screen then visually location point will be changed.

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