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//
// ImageViewGridLayer.m
// VertexHelper
//
// Created by Johannes Fahrenkrug on 20.02.10.
// Copyright 2010 Springenwerk. All rights reserved.
//

#import "ImageViewGridLayer.h"
#import "VertexDocument.h"

// Thanks to Bill Dudney (http://bill.dudney.net/roller/objc/entry/nscolor_cgcolorref)
@interface NSColor(CGColor)
- (CGColorRef)CGColor;
@end

@implementation NSColor(CGColor)
- (CGColorRef)CGColor {
    CGColorSpaceRef colorSpace = [[self colorSpace] CGColorSpace];
    NSInteger componentCount = [self numberOfComponents];
    CGFloat *components = (CGFloat *)calloc(componentCount, sizeof(CGFloat));
    [self getComponents:components];
    CGColorRef color = CGColorCreate(colorSpace, components);
    free((void*)components);
    return color;
}
@end


@implementation ImageViewGridLayer

@synthesize owner, document, rows, cols;

// -------------------------------------------------------------------------
// init
// -------------------------------------------------------------------------
- (id) init
{
if((self = [super init])){
//needs to redraw when bounds change
[self setNeedsDisplayOnBoundsChange:YES];
green = [[NSColor greenColor] CGColor];
gray = [[NSColor grayColor] CGColor];
}

return self;
}

// -------------------------------------------------------------------------
// actionForKey:
//
// always return nil, to never animate
// -------------------------------------------------------------------------
- (id<CAAction>)actionForKey:(NSString *)event
{
return nil;
}

// -------------------------------------------------------------------------
// drawInContext:
//
// draw a metal background that scrolls when the image browser scroll
// -------------------------------------------------------------------------
- (void)drawInContext:(CGContextRef)context
{
//retreive bounds and visible rect
NSSize imageSize = [owner imageSize];


int i = 0;
float colWidth = (imageSize.width / cols);
float rowHeight = (imageSize.height / rows);

CGContextSetLineWidth(context, 1.0);

for (i = 0; i <= cols; i++) {
CGContextMoveToPoint(context, (imageSize.width / cols) * i, 0);
CGContextAddLineToPoint(context, (imageSize.width / cols) * i, imageSize.height);
}

for (i = 0; i <= rows; i++) {
CGContextMoveToPoint(context, 0, (imageSize.height / rows) * i);
CGContextAddLineToPoint(context, imageSize.width, (imageSize.height / rows) * i);
}

CGContextStrokePath(context);

// now we stroke the points...
for (int r = 0; r < [document.pointMatrix count]; r++) {
for (int c = 0; c < [[document.pointMatrix objectAtIndex:r] count]; c++) {
NSMutableArray *points = [[document.pointMatrix objectAtIndex:r] objectAtIndex:c];
float originX = (imageSize.width / cols) * c;
float originY = (imageSize.height / rows) * r;
float firstX = 0;
float firstY = 0;
float lastX = 0;
float lastY = 0;

// at the beginning of a different sprite...

if ([points count] > 1) {
for (int p = 0; p < [points count]; p++) {
float x = [[points objectAtIndex:p] pointValue].x + (colWidth / 2) + originX;
float y = [[points objectAtIndex:p] pointValue].y + (rowHeight / 2) + originY;


if (p == 0) {
CGContextMoveToPoint(context, x, y);
firstX = x;
firstY = y;
} else {
CGContextAddLineToPoint(context, x, y);
lastX = x;
lastY = y;
}

}
CGContextSetStrokeColorWithColor(context, green);
CGContextStrokePath(context);

// the last "auto-connected" line will have a different color...
CGContextSetStrokeColorWithColor(context, gray);
CGContextMoveToPoint(context, lastX, lastY);
CGContextAddLineToPoint(context, firstX, firstY);
CGContextStrokePath(context);
}
}
}

CGContextStrokePath(context);
}

-(CALayer *)hitTest:(CGPoint)aPoint {
//NSLog(@"hittest x: %.f, y: %.f", aPoint.x, aPoint.y);
// don't allow any mouse clicks for subviews in this view
    NSPoint hitPoint = NSPointFromCGPoint(aPoint);
    
if (owner.currentToolMode == IKToolModeAnnotate) {
NSPoint p = [owner convertViewPointToImagePoint:hitPoint];
//NSLog(@"hittest x: %.f, y: %.f", p.x, p.y);
NSSize imageSize = [owner imageSize];
NSPoint relativePoint = NSMakePoint(0, 0);
float colWidth = (imageSize.width / cols);
float rowHeight = (imageSize.height / rows);

float yExtra = (int)(p.y) % (int)rowHeight;
float xExtra = (int)p.x % (int)colWidth;
int currentRow = p.y / rowHeight + (yExtra > 0 ? 1 : 0);
int currentCol = p.x / colWidth + (xExtra > 0 ? 1 : 0);

if (currentRow > 0 && currentCol > 0 && currentCol <= cols && currentRow <= rows) {
relativePoint.x = (p.x - ((currentCol - 1) * colWidth)) - (colWidth / 2);
relativePoint.y = (p.y - ((currentRow - 1) * rowHeight)) - (rowHeight / 2);

[document addPoint:relativePoint forRow:currentRow col:currentCol];
}

}

if(NSPointInRect(hitPoint, NSRectFromCGRect([self bounds]))) {
return self;
} else {
return nil;
}
}

- (void)dealloc
{
CGColorRelease(gray);
CGColorRelease(green);

[super dealloc];
}


@end
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