TreemapKit is a treemap implementation for Cocoa Touch. You can display treemaps in iPhone, iPod touch and iPad.

Click here to see the simple demo app

TreemapKit is provided under the MIT License.

1. Copy TreemapKit folder to your source tree and add it to Xcode project.
2. Import "TreemapView.h" from your code.
3. Implement both TreemapViewDataSource and TreemapViewDelegate protocols.

- (void)reloadData

Reload the data of the treemap.

Call this method to reload all the data that is used to construct the treemap including cells. If you want to change the cell content, implement treemapView:updateCell:forIndex:forRect:.

A basic implementation of the treemap cell. You can make a sub-class to show more information or images.

UILabel *textLabel

The label used for the main textual content of the tremap cell.

UILabel *valueLabel

The label used to show a value of the cell.

NSinteger index

The cell index.

- (id)initWithFrame:(CGRect)frame

Initialize the cell with a frame.

The data source protocol for a TreemapView object.

- (NSArray *)valuesForTreemapView:(TreemapView *)treemapView;

Provides data for a TreemapView as a NSArray.

Tree or other data structures are currently not supported.

- (TreemapViewCell *)treemapView:(TreemapView *)treemapView cellForIndex:(NSInteger)index forRect:(CGRect)rect;

Returns a cell object for the specified place. You need to create a TreemapViewCell and return it.

- (float)treemapView:(TreemapView *)treemapView separatorWidthForDepth:(NSInteger)depth;

Returns a separator width for the specified depth. If you don't need to change the width for the specified depth, return 0. The default separator width is 0.

- (NSInteger)treemapView:(TreemapView *)treemapView separationPositionForDepth:(NSInteger)depth;

Normally TreemapView separate two rectangles with calculating the areas, but if you want to separate two groups manually, return the index of the cells. If you don't need to change the separation position for the specified depth, return NSIntegerMax.

The delegate of a TreemapView object.

- (void)treemapView:(TreemapView *)treemapView tapped:(NSInteger)index;

Tells the delegate that the specified cell is tapped.

- (void)treemapView:(TreemapView *)treemapView updateCell:(TreemapViewCell *)cell forIndex:(NSInteger)index forRect:(CGRect)rect;

Tells the delegate that the specified cell should be updated. You need to update the cell content manually in this method.

• @chris124's three20 branch