It resembles a first approximation to a rough draft...

[ipdf/sam.git] / chapters / Background / CoordinateSystems.tex

diff --git a/chapters/Background/CoordinateSystems.tex b/chapters/Background/CoordinateSystems.tex
index 147a684..3a61cb3 100644 (file)
--- a/chapters/Background/CoordinateSystems.tex
+++ b/chapters/Background/CoordinateSystems.tex
@@ -39,6 +39,15 @@ The document can be scaled by a factor of $s$ about a point $(x_0,y_0)$ specifie
 
 The effect of this transformation is that, measured relative to the view rectangle, the distance of primitives with coordinates $(x, y)$ to the point $(x_0, y_0)$ will decrease by a factor of $s$. For $s < 1$ the operation is ``zooming out'' and for $s > 1$, ``zooming in''.
 
+
+{\bf TODO}
+\begin{itemize}
+       \item Intermediate coordinate systems...
+       \item Write Matrix operations properly
+       \item Link with the results where applying \eqref{view-transformation} directly leads to disaster
+       \item This is because for $v_w << 1$, an error of $1 ulp$ in $x - v_x$ is comparable with $v_w$, ie: Can increase to the order of the size of the display (or more)
+\end{itemize}
+
 %TODO List
 % Mention that these transformations affect precision more than eg: drawing a line
 % Discuss floating point errors that could occur?