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//
// Grid.m
// TikZiT
//
// Copyright 2010 Aleks Kissinger. All rights reserved.
//
//
// This file is part of TikZiT.
//
// TikZiT is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// TikZiT is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with TikZiT. If not, see <http://www.gnu.org/licenses/>.
//
#import "Grid.h"
@implementation Grid
@synthesize size;
- (id)initWithSpacing:(float)spacing
subdivisions:(int)subs
transformer:(Transformer*)t
{
if (!(self = [super init])) return nil;
gridX = spacing;
gridY = spacing;
subdivisions = subs;
size.width = 0;
size.height = 0;
transformer = t;
return self;
}
+ (Grid*)gridWithSpacing:(float)spacing
subdivisions:(int)subs
transformer:(Transformer*)t
{
return [[Grid alloc] initWithSpacing:spacing
subdivisions:subs
transformer:t];
}
- (float)gridX {
return gridX;
}
- (float)gridY {
return gridY;
}
- (int)subdivisions {
return subdivisions;
}
- (void)setSubdivisions:(int)subs {
subdivisions = subs;
}
- (NSPoint)snapScreenPoint:(NSPoint)p {
NSPoint snap;
float gridCellX = [transformer scaleToScreen:gridX] / (float)subdivisions;
float gridCellY = [transformer scaleToScreen:gridY] / (float)subdivisions;
// snap along grid lines, relative to the origin
snap.x = floor(((p.x-[transformer origin].x)/gridCellX)+0.5)*gridCellX + [transformer origin].x;
snap.y = floor(((p.y-[transformer origin].y)/gridCellY)+0.5)*gridCellY + [transformer origin].y;
return snap;
}
-(void)drawLayer:(CALayer *)layer inContext:(CGContextRef)context
{
CGContextSaveGState(context);
CGContextSetShouldAntialias(context, NO);
float x,y;
float grX = [transformer scaleToScreen:gridX];
float grY = [transformer scaleToScreen:gridY];
float gridCellX = grX / (float)subdivisions;
float gridCellY = grY / (float)subdivisions;
for (x = [transformer origin].x + gridCellX; x < size.width; x += gridCellX) {
CGContextMoveToPoint(context, x, 0);
CGContextAddLineToPoint(context, x, size.height);
}
for (x = [transformer origin].x - gridCellX; x > 0; x -= gridCellX) {
CGContextMoveToPoint(context, x, 0);
CGContextAddLineToPoint(context, x, size.height);
}
for (y = [transformer origin].y + gridCellY; y < size.height; y += gridCellY) {
CGContextMoveToPoint(context, 0, y);
CGContextAddLineToPoint(context, size.width, y);
}
for (y = [transformer origin].y - gridCellY; y > 0; y -= gridCellY) {
CGContextMoveToPoint(context, 0, y);
CGContextAddLineToPoint(context, size.width, y);
}
CGContextSetRGBStrokeColor(context, 0.9, 0.9, 1, 1);
CGContextStrokePath(context);
for (x = [transformer origin].x + grX; x < size.width; x += grX) {
CGContextMoveToPoint(context, x, 0);
CGContextAddLineToPoint(context, x, size.height);
}
for (x = [transformer origin].x - grX; x > 0; x -= grX) {
CGContextMoveToPoint(context, x, 0);
CGContextAddLineToPoint(context, x, size.height);
}
for (y = [transformer origin].y + grY; y < size.height; y += grY) {
CGContextMoveToPoint(context, 0, y);
CGContextAddLineToPoint(context, size.width, y);
}
for (y = [transformer origin].y + grY; y > 0; y -= grY) {
CGContextMoveToPoint(context, 0, y);
CGContextAddLineToPoint(context, size.width, y);
}
CGContextSetRGBStrokeColor(context, 0.8, 0.8, 0.9, 1);
CGContextStrokePath(context);
CGContextMoveToPoint(context, [transformer origin].x, 0);
CGContextAddLineToPoint(context, [transformer origin].x, size.height);
CGContextMoveToPoint(context, 0, [transformer origin].y);
CGContextAddLineToPoint(context, size.width, [transformer origin].y);
CGContextSetRGBStrokeColor(context, 0.6, 0.6, 0.7, 1);
CGContextStrokePath(context);
CGContextRestoreGState(context);
}
@end
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