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//
// EdgeControlLayer.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 "EdgeControlLayer.h"
#import "util.h"
@implementation EdgeControlLayer
- (id)initWithEdge:(Edge*)e andTransformer:(Transformer*)t {
[super init];
transformer = t;
edge = e;
self.opacity = 0.0f;
return self;
}
- (void)select {
selected = YES;
self.opacity = 1.0f;
}
- (void)deselect {
selected = NO;
self.opacity = 0.0f;
}
- (void)highlight {
if (!selected) {
self.opacity = 0.5f;
}
}
- (void)unhighlight {
if (!selected) {
self.opacity = 0.0f;
}
}
- (void)drawInContext:(CGContextRef)ctx {
CGContextSaveGState(ctx);
[edge updateControls];
CGPoint source = NSPointToCGPoint([transformer toScreen:[[edge source] point]]);
CGPoint target = NSPointToCGPoint([transformer toScreen:[[edge target] point]]);
CGPoint mid = NSPointToCGPoint([transformer toScreen:[edge mid]]);
CGPoint cp1 = NSPointToCGPoint([transformer toScreen:[edge cp1]]);
CGPoint cp2 = NSPointToCGPoint([transformer toScreen:[edge cp2]]);
float dx = (target.x - source.x);
float dy = (target.y - source.y);
// draw a circle at the midpoint
CGRect mid_rect = CGRectMake(mid.x-3.0f, mid.y-3.0f, 6.0f, 6.0f);
CGContextAddEllipseInRect(ctx, mid_rect);
CGContextSetLineWidth(ctx, 1.0f);
CGContextSetRGBFillColor(ctx, 1.0f, 1.0f, 1.0f, 0.5f);
CGContextSetRGBStrokeColor(ctx, 0.0f, 0.0f, 1.0f, 0.5f);
CGContextDrawPath(ctx, kCGPathFillStroke);
CGContextSetShouldAntialias(ctx, YES);
// compute size of control circles
float cdist;
if (dx == 0 && dy == 0) cdist = [transformer scaleToScreen:edge.weight];
else cdist = sqrt(dx*dx + dy*dy) * edge.weight;
// if basic bend, draw blue, if inout, draw green
if ([edge bendMode] == EdgeBendModeBasic) CGContextSetRGBStrokeColor(ctx, 0, 0, 1, 0.4f);
else CGContextSetRGBStrokeColor(ctx, 0, 0.7f, 0, 0.4f);
// draw source control circle
CGRect ellipse1 = CGRectMake(source.x-cdist, source.y-cdist, cdist*2.0f, cdist*2.0f);
CGContextAddEllipseInRect(ctx, ellipse1);
if (dx!=0 || dy!=0) {
CGRect ellipse2 = CGRectMake(target.x-cdist, target.y-cdist, cdist*2.0f, cdist*2.0f);
CGContextAddEllipseInRect(ctx, ellipse2);
}
CGContextStrokePath(ctx);
float handleRad = [EdgeControlLayer handleRadius];
// handles
CGRect ctrl1 = CGRectMake(cp1.x-handleRad, cp1.y-handleRad, 2*handleRad, 2*handleRad);
CGRect ctrl2 = CGRectMake(cp2.x-handleRad, cp2.y-handleRad, 2*handleRad, 2*handleRad);
CGContextSetRGBFillColor(ctx, 1.0f, 1.0f, 1.0f, 0.8f);
// draw a line from source vertex to first handle
if ([edge bendMode] == EdgeBendModeInOut) {
if ([edge outAngle] % 45 == 0) CGContextSetRGBStrokeColor(ctx, 1, 0, 1, 0.6f);
else CGContextSetRGBStrokeColor(ctx, 0, 0.7f, 0, 0.4f);
} else {
if ([edge bend] % 45 == 0) CGContextSetRGBStrokeColor(ctx, 1, 0, 1, 0.6f);
else CGContextSetRGBStrokeColor(ctx, 0, 0, 1, 0.4f);
}
CGContextMoveToPoint(ctx, source.x, source.y);
CGContextAddLineToPoint(ctx, cp1.x, cp1.y);
CGContextStrokePath(ctx);
CGContextAddEllipseInRect(ctx, ctrl1);
CGContextDrawPath(ctx, kCGPathFillStroke);
// draw a line from target vertex to second handle
if ([edge bendMode] == EdgeBendModeInOut) {
if ([edge inAngle] % 45 == 0) CGContextSetRGBStrokeColor(ctx, 1, 0, 1, 0.6f);
else CGContextSetRGBStrokeColor(ctx, 0, 0.7f, 0, 0.4f);
} else {
if ([edge bend] % 45 == 0) CGContextSetRGBStrokeColor(ctx, 1, 0, 1, 0.6f);
else CGContextSetRGBStrokeColor(ctx, 0, 0, 1, 0.4f);
}
CGContextMoveToPoint(ctx, target.x, target.y);
CGContextAddLineToPoint(ctx, cp2.x, cp2.y);
CGContextStrokePath(ctx);
CGContextAddEllipseInRect(ctx, ctrl2);
CGContextDrawPath(ctx, kCGPathFillStroke);
CGContextRestoreGState(ctx);
}
+ (float)handleRadius { return 4.0f; }
@end
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