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/*
* Copyright 2011 Alex Merry <dev@randomguy3.me.uk>
* Copyright 2010 Chris Heunen
*
* This program 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 2 of
* the License, or (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#import "Grid.h"
#import "util.h"
@implementation Grid
+ (Grid*) gridWithSpacing:(float)sp subdivisions:(int)subs transformer:(Transformer*)t {
return [[[self alloc] initWithSpacing:sp subdivisions:subs transformer:t] autorelease];
}
- (id) initWithSpacing:(float)sp subdivisions:(int)subs transformer:(Transformer*)t {
self = [super init];
if (self) {
transformer = [t retain];
spacing = sp;
cellSubdivisions = subs;
}
return self;
}
- (id) copyWithZone:(NSZone*)zone {
return [[Grid allocWithZone:zone]
initWithSpacing:spacing
subdivisions:cellSubdivisions
transformer:transformer];
}
- (void) dealloc {
[transformer release];
[super dealloc];
}
- (int) cellSubdivisions {
return cellSubdivisions;
}
- (void) setCellSubdivisions:(int)count {
cellSubdivisions = count;
}
- (float) cellSpacing {
return spacing;
}
- (void) setCellSpacing:(float)sp {
spacing = sp;
}
- (NSPoint) snapScreenPoint:(NSPoint)point {
NSPoint gridPoint = [transformer fromScreen:point];
return [transformer toScreen:[self snapPoint:gridPoint]];
}
- (NSPoint) snapPoint:(NSPoint)p {
const float snapDistance = spacing/(float)cellSubdivisions;
p.x = roundToNearest (snapDistance, p.x);
p.y = roundToNearest (snapDistance, p.y);
return p;
}
- (void) _setupLinesForContext:(id<RenderContext>)context withSpacing:(float)offset omittingEvery:(int)omitEvery origin:(NSPoint)origin {
NSRect clip = [context clipBoundingBox];
float clipx1 = clip.origin.x;
float clipx2 = clipx1 + clip.size.width;
float clipy1 = clip.origin.y;
float clipy2 = clipy1 + clip.size.height;
// left of the Y axis, moving outwards
unsigned int count = 1;
float x = origin.x - offset;
while (x >= clipx1) {
if (omitEvery == 0 || (count % omitEvery != 0)) {
[context moveTo:NSMakePoint(x, clipy1)];
[context lineTo:NSMakePoint(x, clipy2)];
}
x -= offset;
++count;
}
// right of the Y axis, moving outwards
count = 1;
x = origin.x + offset;
while (x <= clipx2) {
if (omitEvery == 0 || (count % omitEvery != 0)) {
[context moveTo:NSMakePoint(x, clipy1)];
[context lineTo:NSMakePoint(x, clipy2)];
}
x += offset;
++count;
}
// above the Y axis, moving outwards
count = 1;
float y = origin.y - offset;
while (y >= clipy1) {
if (omitEvery == 0 || (count % omitEvery != 0)) {
[context moveTo:NSMakePoint(clipx1, y)];
[context lineTo:NSMakePoint(clipx2, y)];
}
y -= offset;
++count;
}
// below the Y axis, moving outwards
count = 1;
y = origin.y + offset;
while (y <= clipy2) {
if (omitEvery == 0 || (count % omitEvery != 0)) {
[context moveTo:NSMakePoint(clipx1, y)];
[context lineTo:NSMakePoint(clipx2, y)];
}
y += offset;
++count;
}
}
- (void) _renderSubdivisionsWithContext:(id<RenderContext>)context origin:(NSPoint)origin cellSize:(float)cellSize {
const float offset = cellSize / cellSubdivisions;
[self _setupLinesForContext:context withSpacing:offset omittingEvery:cellSubdivisions origin:origin];
[context strokePathWithColor:MakeSolidRColor (0.9, 0.9, 1.0)];
}
- (void) _renderCellsWithContext:(id<RenderContext>)context origin:(NSPoint)origin cellSize:(float)cellSize {
[self _setupLinesForContext:context withSpacing:cellSize omittingEvery:0 origin:origin];
[context strokePathWithColor:MakeSolidRColor (0.8, 0.8, 0.9)];
}
- (void) _renderAxesWithContext:(id<RenderContext>)context origin:(NSPoint)origin {
NSRect clip = [context clipBoundingBox];
[context moveTo:NSMakePoint(origin.x, clip.origin.y)];
[context lineTo:NSMakePoint(origin.x, clip.origin.y + clip.size.height)];
[context moveTo:NSMakePoint(clip.origin.x, origin.y)];
[context lineTo:NSMakePoint(clip.origin.x + clip.size.width, origin.y)];
[context strokePathWithColor:MakeSolidRColor (0.6, 0.6, 0.7)];
}
- (void) renderGridInContext:(id<RenderContext>)cr {
[self renderGridInContext:cr transformer:transformer];
}
- (void) renderGridInContext:(id<RenderContext>)context transformer:(Transformer*)t {
const NSPoint origin = [t toScreen:NSZeroPoint];
const float cellSize = [t scaleToScreen:spacing];
[context saveState];
// common line settings
[context setLineWidth:1.0];
[context setAntialiasMode:AntialiasDisabled];
[self _renderSubdivisionsWithContext:context origin:origin cellSize:cellSize];
[self _renderCellsWithContext:context origin:origin cellSize:cellSize];
[self _renderAxesWithContext:context origin:origin];
[context restoreState];
}
@end
// vi:ft=objc:ts=4:noet:sts=4:sw=4
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