Rotating or flipping a bitmap 13 – Apple Newton Programmer’s Newton 2.0 (for Newton 2.0) User Manual

Page 545

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C H A P T E R 1 3

Drawing and Graphics

Using the Drawing Interface

13-19

Figure 13-10

Example of

ViewIntoBitmap

method

Rotating or Flipping a Bitmap

Use the

MungeBitmap

function (page 10-22) to perform various bitmap operations

such as rotating or flipping the bitmap. These operations are destructive to the bitmap
passed as an argument to this function; the bitmap is modified in place and the
modified bitmap shape is returned. Figure 13-11 illustrates how the

MungeBitmap

function works. See “Using Bitmaps” (page 13-17) for a code example.

Figure 13-11

Example of

MungeBitmap

method

(0, 0)

(50, 100)

(10, 10)

srcRect

destBitmap

destRect

view to capture

(115, 310)

(15, 10)

myBitmap

after calling

MungeBitmap (myBitmap, 'rotateLeft);

(315,110)

(15, 10)