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Diffstat (limited to 'src/common/Transformer.m')
| -rw-r--r-- | src/common/Transformer.m | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/src/common/Transformer.m b/src/common/Transformer.m new file mode 100644 index 0000000..fe4d135 --- /dev/null +++ b/src/common/Transformer.m @@ -0,0 +1,221 @@ +// +// Transformer.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 "Transformer.h" + +float const PIXELS_PER_UNIT = 50; + +@implementation Transformer + ++ (Transformer*)transformer { + return [[[Transformer alloc] init] autorelease]; +} + ++ (Transformer*)transformerWithTransformer:(Transformer*)t { + return [[t copy] autorelease]; +} + ++ (Transformer*)transformerWithOrigin:(NSPoint)o andScale:(float)scale { + Transformer *trans = [self transformer]; + [trans setOrigin:o]; + [trans setScale:scale]; + return trans; +} + ++ (Transformer*)transformerToFit:(NSRect)graphRect + intoScreenRect:(NSRect)screenRect { + return [self transformerToFit:graphRect + intoScreenRect:screenRect + flippedAboutXAxis:NO + flippedAboutYAxis:NO]; +} + ++ (Transformer*)transformerToFit:(NSRect)graphRect + intoScreenRect:(NSRect)screenRect + flippedAboutXAxis:(BOOL)flipX { + return [self transformerToFit:graphRect + intoScreenRect:screenRect + flippedAboutXAxis:flipX + flippedAboutYAxis:NO]; +} + ++ (Transformer*)transformerToFit:(NSRect)graphRect + intoScreenRect:(NSRect)screenRect + flippedAboutYAxis:(BOOL)flipY { + return [self transformerToFit:graphRect + intoScreenRect:screenRect + flippedAboutXAxis:NO + flippedAboutYAxis:flipY]; +} + ++ (Transformer*)transformerToFit:(NSRect)graphRect + intoScreenRect:(NSRect)screenRect + flippedAboutXAxis:(BOOL)flipAboutXAxis + flippedAboutYAxis:(BOOL)flipAboutYAxis { + + const float wscale = screenRect.size.width / graphRect.size.width; + const float hscale = screenRect.size.height / graphRect.size.height; + const float scale = (wscale < hscale) ? wscale : hscale; + const float xpad = (screenRect.size.width - (graphRect.size.width * scale)) / 2.0; + const float ypad = (screenRect.size.height - (graphRect.size.height * scale)) / 2.0; + + // if we are flipping, we need to calculate the origin from the opposite edge + const float gx = flipAboutYAxis ? -(graphRect.size.width + graphRect.origin.x) + : graphRect.origin.x; + const float gy = flipAboutXAxis ? -(graphRect.size.height + graphRect.origin.y) + : graphRect.origin.y; + const float origin_x = screenRect.origin.x - (gx * scale) + xpad; + const float origin_y = screenRect.origin.y - (gy * scale) + ypad; + + Transformer *trans = [self transformer]; + [trans setOrigin:NSMakePoint(origin_x, origin_y)]; + [trans setScale:scale]; + [trans setFlippedAboutXAxis:flipAboutXAxis]; + [trans setFlippedAboutYAxis:flipAboutYAxis]; + return trans; +} + +- (id) init { + self = [super init]; + + if (self) { + origin = NSZeroPoint; + x_scale = 1.0f; + y_scale = 1.0f; + } + + return self; +} + +- (NSPoint)origin { return origin; } +- (void)setOrigin:(NSPoint)o { + origin = o; +} + +- (float)scale { return ABS(x_scale); } +- (void)setScale:(float)s { + x_scale = (x_scale < 0.0) ? -s : s; + y_scale = (y_scale < 0.0) ? -s : s; +} + +- (BOOL)isFlippedAboutXAxis { + return y_scale < 0.0; +} + +- (void)setFlippedAboutXAxis:(BOOL)flip { + if (flip != [self isFlippedAboutXAxis]) { + y_scale *= -1; + } +} + +- (BOOL)isFlippedAboutYAxis { + return x_scale < 0.0; +} + +- (void)setFlippedAboutYAxis:(BOOL)flip { + if (flip != [self isFlippedAboutYAxis]) { + x_scale *= -1; + } +} + +- (NSPoint)fromScreen:(NSPoint)p { + NSPoint trans; + trans.x = (p.x - origin.x) / x_scale; + trans.y = (p.y - origin.y) / y_scale; + return trans; +} + +- (NSPoint)toScreen:(NSPoint)p { + NSPoint trans; + trans.x = (p.x * x_scale) + origin.x; + trans.y = (p.y * y_scale) + origin.y; + return trans; +} + +- (float)scaleFromScreen:(float)dist { + return dist / ABS(x_scale); +} + +- (float)scaleToScreen:(float)dist { + return dist * ABS(x_scale); +} + +- (NSRect)rectFromScreen:(NSRect)r { + NSRect r1; + r1.origin = [self fromScreen:r.origin]; + r1.size.width = [self scaleFromScreen:r.size.width]; + r1.size.height = [self scaleFromScreen:r.size.height]; + // if we're flipped, the origin will be at a different corner + if ([self isFlippedAboutYAxis]) { + r1.origin.x -= r1.size.width; + } + if ([self isFlippedAboutXAxis]) { + r1.origin.y -= r1.size.height; + } + return r1; +} + +- (NSRect)rectToScreen:(NSRect)r { + NSPoint o = r.origin; + // if we're flipped, the origin will be at a different corner + if ([self isFlippedAboutYAxis]) { + o.x = NSMaxX(r); + } + if ([self isFlippedAboutXAxis]) { + o.y = NSMaxY(r); + } + NSRect r1; + r1.origin = [self toScreen:o]; + r1.size.width = [self scaleToScreen:r.size.width]; + r1.size.height = [self scaleToScreen:r.size.height]; + return r1; +} + +- (id)copyWithZone:(NSZone *)zone { + Transformer *cp = [[[self class] allocWithZone:zone] init]; + cp->origin = origin; + cp->x_scale = x_scale; + cp->y_scale = y_scale; + return cp; +} + +- (BOOL)isEqual:(id)object { + Transformer *t = (Transformer*)object; + return ([t origin].x == [self origin].x && + [t origin].y == [self origin].y && + [t scale] == [self scale]); +} + +Transformer *defaultTransformer = nil; + ++ (Transformer*)defaultTransformer { + if (defaultTransformer == nil) { + defaultTransformer = [[Transformer alloc] init]; + [defaultTransformer setScale:PIXELS_PER_UNIT]; + } + return defaultTransformer; +} + +@end + +// vi:ft=objc:ts=4:noet:sts=4:sw=4 |