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Update README.md

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Michael Fogleman 2016-02-21 17:20:33 -05:00
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@ -66,6 +66,8 @@ StrokePreserve()
FillPreserve()
```
It is often desired to center an image at a point. Use `DrawImageAnchored` with `ax` and `ay` set to 0.5 to do this. Use 0 to left or top align. Use 1 to right or bottom align. `DrawStringAnchored` does the same for text, so you don't need to call `MeasureString` yourself.
## Text Functions
```go
@ -113,6 +115,10 @@ TransformPoint(x, y float64) (tx, ty float64)
InvertY()
```
It is often desired to rotate or scale about a point that is not the origin. The functions `RotateAbout`, `ScaleAbout`, `ShearAbout` are provided as a convenience.
`InvertY` is provided in case Y should increase from bottom to top vs. the default top to bottom.
Note: transforms do not currently affect `DrawImage` or `DrawString`.
## Stack Functions