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//
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// RMCoordinateGridSource.m
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// MapView
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//
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// Copyright (c) 2008-2012, Route-Me Contributors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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#import "RMCoordinateGridSource.h"
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#import "RMTileCache.h"
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#define kTileSidePadding 25.0 // px
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static double coordinateGridSpacing[19] = {
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45.0, // 0
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45.0, // 1
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45.0, // 2
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10.0, // 3
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5.0, // 4
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5.0, // 5
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2.0, // 6
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1.0, // 7
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1.0, // 8
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0.5, // 9
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0.25, // 10
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(1.0 / 60.0) * 5.0, // 11
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(1.0 / 60.0) * 3.0, // 12
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(1.0 / 60.0) * 2.0, // 13
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(1.0 / 60.0), // 14
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(1.0 / 60.0), // 15
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(1.0 / 60.0), // 16
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(1.0 / 60.0), // 17
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(1.0 / 60.0), // 18
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};
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static double coordinateGridSpacingDecimal[19] = {
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45.0, // 0
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45.0, // 1
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45.0, // 2
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10.0, // 3
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5.0, // 4
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5.0, // 5
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2.0, // 6
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1.0, // 7
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1.0, // 8
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0.5, // 9
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0.25, // 10
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0.10, // 11
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0.05, // 12
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0.05, // 13
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0.01, // 14
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0.01, // 15
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0.01, // 16
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0.01, // 17
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0.01, // 18
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};
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@implementation RMCoordinateGridSource
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@synthesize gridColor = _gridColor;
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@synthesize gridLineWidth = _gridLineWidth;
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@synthesize gridMode = _labelingMode;
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@synthesize minorLabelColor = _minorLabelColor;
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@synthesize minorLabelFont = _minorLabelFont;
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@synthesize majorLabelColor = _majorLabelColor;
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@synthesize majorLabelFont = _majorLabelFont;
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- (id)init
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{
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if (!(self = [super init]))
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return nil;
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self.minZoom = 5;
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self.maxZoom = 18;
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self.gridColor = [UIColor colorWithWhite:0.1 alpha:0.6];
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self.gridLineWidth = 2.0;
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self.gridMode = GridModeGeographicDecimal;
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self.minorLabelColor = self.majorLabelColor = [UIColor colorWithWhite:0.1 alpha:0.6];
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self.minorLabelFont = [UIFont boldSystemFontOfSize:14.0];
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self.majorLabelFont = [UIFont boldSystemFontOfSize:11.0];
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return self;
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}
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- (UIImage *)imageForTile:(RMTile)tile inCache:(RMTileCache *)tileCache
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{
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if (tile.zoom < 0 || tile.zoom > 18)
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return nil;
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UIImage *image = nil;
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tile = [[self mercatorToTileProjection] normaliseTile:tile];
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image = [tileCache cachedImage:tile withCacheKey:[self uniqueTilecacheKey]];
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if (image)
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return image;
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// Implementation
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RMProjectedRect planetBounds = self.projection.planetBounds;
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double scale = (1<<tile.zoom);
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double tileMetersPerPixel = planetBounds.size.width / (self.tileSideLength * scale);
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double paddedTileSideLength = self.tileSideLength + (2.0 * kTileSidePadding);
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CGPoint bottomLeft = CGPointMake((tile.x * self.tileSideLength) - kTileSidePadding,
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((scale - tile.y - 1) * self.tileSideLength) - kTileSidePadding);
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RMProjectedRect normalizedProjectedRect;
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normalizedProjectedRect.origin.x = (bottomLeft.x * tileMetersPerPixel) - fabs(planetBounds.origin.x);
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normalizedProjectedRect.origin.y = (bottomLeft.y * tileMetersPerPixel) - fabs(planetBounds.origin.y);
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normalizedProjectedRect.size.width = paddedTileSideLength * tileMetersPerPixel;
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normalizedProjectedRect.size.height = paddedTileSideLength * tileMetersPerPixel;
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CLLocationCoordinate2D southWest = [self.projection projectedPointToCoordinate:
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RMProjectedPointMake(normalizedProjectedRect.origin.x,
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normalizedProjectedRect.origin.y)];
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CLLocationCoordinate2D northEast = [self.projection projectedPointToCoordinate:
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RMProjectedPointMake(normalizedProjectedRect.origin.x + normalizedProjectedRect.size.width,
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normalizedProjectedRect.origin.y + normalizedProjectedRect.size.height)];
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double gridSpacing;
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switch (self.gridMode)
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{
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case GridModeGeographic: {
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gridSpacing = coordinateGridSpacing[tile.zoom];
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break;
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}
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case GridModeGeographicDecimal:
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case GridModeUTM:
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default: {
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gridSpacing = coordinateGridSpacingDecimal[tile.zoom];
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break;
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}
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}
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double coordinatesLatitudeSpan = northEast.latitude - southWest.latitude,
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coordinatesLongitudeSpan = northEast.longitude - southWest.longitude;
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double bottom = floor(southWest.latitude / gridSpacing) * gridSpacing,
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top = floor(northEast.latitude / gridSpacing) * gridSpacing;
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double left = ceil(southWest.longitude / gridSpacing) * gridSpacing,
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right = ceil(northEast.longitude / gridSpacing) * gridSpacing;
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// Draw the tile
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UIGraphicsBeginImageContext(CGSizeMake(paddedTileSideLength, paddedTileSideLength));
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGContextSetStrokeColorWithColor(context, self.gridColor.CGColor);
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CGContextSetLineWidth(context, self.gridLineWidth);
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// Grid lines
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for (double row = top; row >= bottom; row -= gridSpacing)
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{
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CGFloat yCoordinate = paddedTileSideLength - (((row - southWest.latitude) / coordinatesLatitudeSpan) * paddedTileSideLength);
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CGContextMoveToPoint(context, 0.0, yCoordinate);
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CGContextAddLineToPoint(context, paddedTileSideLength, yCoordinate);
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}
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for (double column = left; column <= right; column += gridSpacing)
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{
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CGFloat xCoordinate = ((column - southWest.longitude) / coordinatesLongitudeSpan) * paddedTileSideLength;
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CGContextMoveToPoint(context, xCoordinate, 0.0);
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CGContextAddLineToPoint(context, xCoordinate, paddedTileSideLength);
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}
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CGContextStrokePath(context);
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// Labels
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for (double row = top; row >= bottom; row -= gridSpacing)
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{
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CGFloat yCoordinate = paddedTileSideLength - (((row - southWest.latitude) / coordinatesLatitudeSpan) * paddedTileSideLength);
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for (double column = (left - (gridSpacing/2.0)); column <= (right + (gridSpacing / 2.0)); column += gridSpacing)
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{
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CGFloat xCoordinate = ((column - southWest.longitude) / coordinatesLongitudeSpan) * paddedTileSideLength;
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NSString *label1 = nil, *label2 = nil;
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double degrees = (row > 0.0 ? floor(row) : ceil(row));
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double fraction = (row > 0.0 ? row - floor(row) : ceil(row) - row);
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switch (self.gridMode)
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{
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case GridModeGeographic: {
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label1 = [NSString stringWithFormat:@"%.0f˚", degrees];
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label2 = [NSString stringWithFormat:@"%02.0f'", fraction * 60.0];
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break;
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}
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case GridModeGeographicDecimal:
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case GridModeUTM:
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default: {
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label1 = [NSString stringWithFormat:@"%.0f", degrees];
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label2 = [NSString stringWithFormat:@"%02.0f", fraction * 100.0];
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}
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}
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// potential problem: some of these functions are not thread safe, so the app will crash
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// if any other thread uses these functions outside of the @synchronized
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@synchronized (self)
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{
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CGSize label1Size = [label1 sizeWithFont:self.majorLabelFont];
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CGSize label2Size = [label2 sizeWithFont:self.minorLabelFont];
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CGFloat upperBorder = yCoordinate - MAX((label1Size.height / 2.0), (label2Size.height / 2.0));
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CGRect labelBackgroundRect = CGRectMake(xCoordinate - label1Size.width - 3.0, upperBorder - 1.0, label1Size.width + label2Size.width + 8.0, MAX(label1Size.height, label2Size.height) + 2.0);
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CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);
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UIRectFill(labelBackgroundRect);
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CGContextSetFillColorWithColor(context, self.majorLabelColor.CGColor);
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[label1 drawAtPoint:CGPointMake(xCoordinate - label1Size.width - 1.0, upperBorder) withFont:self.majorLabelFont];
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CGContextSetFillColorWithColor(context, self.minorLabelColor.CGColor);
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[label2 drawAtPoint:CGPointMake(xCoordinate + 1.0, upperBorder) withFont:self.minorLabelFont];
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}
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}
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}
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for (double column=left; column<=right; column += gridSpacing)
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{
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CGFloat xCoordinate = ((column - southWest.longitude) / coordinatesLongitudeSpan) * paddedTileSideLength;
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for (double row = (top + (gridSpacing/2.0)); row >= (bottom - (gridSpacing/2.0)); row -= gridSpacing)
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{
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CGFloat yCoordinate = paddedTileSideLength - (((row - southWest.latitude) / coordinatesLatitudeSpan) * paddedTileSideLength);
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NSString *label1 = nil, *label2 = nil;
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double degrees = (column > 0.0 ? floor(column) : ceil(column));
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double fraction = (column > 0.0 ? column - floor(column) : ceil(column) - column);
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switch (self.gridMode)
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{
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case GridModeGeographic: {
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label1 = [NSString stringWithFormat:@"%.0f˚", degrees];
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label2 = [NSString stringWithFormat:@"%02.0f'", fraction * 60.0];
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break;
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}
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case GridModeGeographicDecimal:
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case GridModeUTM:
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default: {
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label1 = [NSString stringWithFormat:@"%.0f", degrees];
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label2 = [NSString stringWithFormat:@"%02.0f", fraction * 100.0];
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}
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}
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@synchronized (self)
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{
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CGSize label1Size = [label1 sizeWithFont:self.majorLabelFont];
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CGSize label2Size = [label2 sizeWithFont:self.minorLabelFont];
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CGFloat upperBorder = yCoordinate - MAX((label1Size.height / 2.0), (label2Size.height / 2.0));
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CGRect labelBackgroundRect = CGRectMake(xCoordinate - label1Size.width - 3.0, upperBorder - 1.0, label1Size.width + label2Size.width + 8.0, MAX(label1Size.height, label2Size.height) + 2.0);
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CGContextSetFillColorWithColor(context, [UIColor clearColor].CGColor);
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UIRectFill(labelBackgroundRect);
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CGContextSetFillColorWithColor(context, self.majorLabelColor.CGColor);
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[label1 drawAtPoint:CGPointMake(xCoordinate - label1Size.width - 1.0, upperBorder) withFont:self.majorLabelFont];
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CGContextSetFillColorWithColor(context, self.minorLabelColor.CGColor);
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[label2 drawAtPoint:CGPointMake(xCoordinate + 1.0, upperBorder) withFont:self.minorLabelFont];
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}
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}
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}
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// Image
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image = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(kTileSidePadding, kTileSidePadding, self.tileSideLength, self.tileSideLength));
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image = [UIImage imageWithCGImage:imageRef];
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CGImageRelease(imageRef);
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if (image)
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[tileCache addImage:image forTile:tile withCacheKey:[self uniqueTilecacheKey]];
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return image;
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}
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- (NSString *)uniqueTilecacheKey
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{
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return @"RMCoordinateGrid";
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}
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- (NSString *)shortName
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{
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return @"Coordinate grid";
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}
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- (NSString *)longDescription
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{
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return [self shortName];
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}
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- (NSString *)shortAttribution
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{
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return @"n/a";
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}
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- (NSString *)longAttribution
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{
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return @"n/a";
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}
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@end |
...
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...
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