mapper2.mapper2 Class Reference

Public Member Functions
def	__init__ (self, world, viewport, ydown=True)
	Constructor. More...
def	windowVecToViewport (self, x, y)
	Maps a single vector from world coordinates to viewport (screen) coordinates. More...
def	viewportToWindow (self, x, y)
	Maps a single point from screen coordinates to window (world) coordinates. More...
def	windowToViewport (self, *p)
	Maps points from world coordinates to viewport (screen) coordinates. More...

Public Attributes
	ys
	world
	Three vertices of a triangle in world coordinates. More...
	viewport
	Three vertices of a triangle in GPS coordinates. More...
	T
	Hold the world to GPS transformation matrix. More...
	I
	Inverse matrix of T. More...

Private Member Functions
def	__windowToViewport (self, x, y)
	Maps a single point from world coordinates to viewport (screen) coordinates. More...

Constructor & Destructor Documentation

__init__()

def mapper2.mapper2.__init__	(		self,
			world,
			viewport,
			ydown = True
	)

Constructor.

A linear transformation is uniquely defined by how its base vectors are transformed.

In 2D, three non-colinear points in a coordinate system A, define a base with two vectors.

Therefore, if we know the image of these three points onto another coordinate system B, the transformation that takes A -> B is defined.

Parameters

world	window triangle.
viewport	screen triangle.
ydown	whether Yaxis is upside down.

See also

http://www.math.ucla.edu/~baker/149.1.02w/handouts/i_affine_II.pdf

Member Function Documentation

__windowToViewport()

def mapper2.mapper2.__windowToViewport (   self,   x,   y  )

private

Maps a single point from world coordinates to viewport (screen) coordinates.

Parameters

x,y	given point.

Returns

a new point in screen coordinates.

References _08c_clock.clock.T, mapper2.mapper2.T, mapper.mapper.ys, and mapper2.mapper2.ys.

Referenced by mapper2.mapper2.windowToViewport().

viewportToWindow()

def mapper2.mapper2.viewportToWindow	(		self,
			x,
			y
	)

Maps a single point from screen coordinates to window (world) coordinates.

Parameters

x,y	given point.

Returns

a new point in world coordinates.

References mapper2.mapper2.I.

windowToViewport()

def mapper2.mapper2.windowToViewport	(		self,
		*	p
	)

Maps points from world coordinates to viewport (screen) coordinates.

Parameters

p	a variable number of points.

Returns

two new points in screen coordinates.

References mapper.mapper.__windowToViewport(), and mapper2.mapper2.__windowToViewport().

windowVecToViewport()

def mapper2.mapper2.windowVecToViewport	(		self,
			x,
			y
	)

Maps a single vector from world coordinates to viewport (screen) coordinates.

Parameters

x,y	given vector.

Returns

a new vector in screen coordinates.

References _08c_clock.clock.T, mapper2.mapper2.T, mapper.mapper.ys, and mapper2.mapper2.ys.

Member Data Documentation

I

mapper2.mapper2.I

Inverse matrix of T.

Referenced by mapper2.mapper2.viewportToWindow().

T

mapper2.mapper2.T

Hold the world to GPS transformation matrix.

Referenced by mapper2.mapper2.__windowToViewport(), and mapper2.mapper2.windowVecToViewport().

viewport

mapper2.mapper2.viewport

Three vertices of a triangle in GPS coordinates.

world

mapper2.mapper2.world

Three vertices of a triangle in world coordinates.

ys

mapper2.mapper2.ys

Referenced by mapper2.mapper2.__windowToViewport(), and mapper2.mapper2.windowVecToViewport().

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The documentation for this class was generated from the following file:

• mapper2.py