Coordinate systems in C # WinForm

Mathematically, point is a two-dimensional vector that contains two public integer attributes, with uppercase X and Y (the General Convention for Common Properties in C # begins with a capital letter). Use pointf instead of point when the coordinate is not an integer value of float.

The commonly used size and point structures are the same, with two integer attributes width and height, and variant SizeF, but they are used in a different way. A point is a description of where the entity is, and size is used to indicate how large the entities are, and the transformations can be displayed between them. A point and a size can form a rectangle. In addition, the point and size can be added and reduced: point-size=point;size+size=size; but Point+point (which is wrong) adds a little meaning to it.

The coordinate system in WinForm is divided into three main categories:

1. One is the screen coordinate system, the coordinates of the (0,0) point in the upper left corner of the display, the horizontal axis increases from left to right, and the ordinate is increased from top to bottom.

2. The second category is the form coordinate system, in order to WinForm the upper left corner of the form as (0,0) point, the horizontal axis increases from left to right, and the ordinate is increased from top to bottom.

3. The third class is the form control coordinate system, in which the upper-left corner of the control is (0,0), the horizontal axis is increased from left to right, and the ordinate is increased from top to bottom.

It also provides a method to convert these three kinds of coordinates, such as pointtoclient (), Pointtoscreen () and so on.

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Coordinate systems in C # WinForm