RMMercatorToScreenProjection.h
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//
// ScreenProjection.h
// Images
//
// Created by Joseph Gentle on 28/08/08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <CoreGraphics/CoreGraphics.h>
#import "RMFoundation.h"
@class RMProjection;
// This is a stateful projection. As the screen moves around, so too do projections change.
@interface RMMercatorToScreenProjection : NSObject
{
// What the screen is currently looking at.
RMXYPoint origin;
// The mercator -or-whatever- projection that the map is in.
// This projection move linearly with the screen.
RMProjection *projection;
// Bounds of the screen in pixels
CGRect screenBounds;
// Scale is how many meters in 1 pixel. Larger scale means bigger things are smaller on the screen.
// Scale of 1 means 1 pixel == 1 meter.
// Scale of 10 means 1 pixel == 10 meters.
float scale;
}
- (id) initFromProjection: (RMProjection*) projection ToScreenBounds: (CGRect)aScreenBounds;
// Deltas in screen coordinates.
- (RMXYPoint)movePoint: (RMXYPoint)aPoint by:(CGSize) delta;
- (RMXYRect)moveRect: (RMXYRect)aRect by:(CGSize) delta;
// pivot given in screen coordinates.
- (RMXYPoint)zoomPoint: (RMXYPoint)aPoint byFactor: (float)factor near:(CGPoint) pivot;
- (RMXYRect)zoomRect: (RMXYRect)aRect byFactor: (float)factor near:(CGPoint) pivot;
// Move the screen.
- (void) moveScreenBy: (CGSize) delta;
- (void) zoomScreenByFactor: (float) factor near:(CGPoint) aPoint;
// Project -> screen coordinates.
- (CGPoint)projectXYPoint:(RMXYPoint)aPoint withScale:(float)aScale;
- (CGPoint) projectXYPoint: (RMXYPoint) aPoint;
- (CGRect) projectXYRect: (RMXYRect) aRect;
- (RMXYPoint) projectScreenPointToXY: (CGPoint) aPoint;
- (RMXYRect) projectScreenRectToXY: (CGRect) aRect;
- (RMXYSize)projectScreenSizeToXY: (CGSize) aSize;
- (RMXYPoint)projectScreenPointToXY: (CGPoint) aPixelPoint withScale:(float)aScale;
- (RMXYRect) XYBounds;
- (void) setXYBounds: (RMXYRect) bounds;
- (RMXYPoint) XYCenter;
- (void) setXYCenter: (RMXYPoint) aPoint;
- (CGRect) screenBounds;
@property (assign, readwrite) float scale;
@end