/*

     File: DimensionLineDrawing.m

 Abstract: These functions are used to draw the lines from the edge of a selected view to the edge of the containing view.

  Version: 1.2

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 */

#import "DimensionLineDrawing.h"

#define DIMENSION_LINE_THICKNESS                3.0

#define DIMENSION_LINE_ARROW_SIDE_LENGTH        8.0

#define DIMENSION_LINE_STROKE_COLOR             [NSColor redColor]

#define DIMENSION_LINE_LABEL_TEXT_COLOR         [NSColor redColor]

#define DIMENSION_LINE_LABEL_BACKGROUND_COLOR   [NSColor yellowColor]

static void DrawDimensionLineLabelAtCenterPoint(CGFloat dimension, NSPoint center) {

    NSString *labelString = [NSString stringWithFormat:@"%ld", (long)dimension];

    NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:[NSFont systemFontOfSize:[NSFont systemFontSizeForControlSize:NSRegularControlSize]], NSFontAttributeName, DIMENSION_LINE_LABEL_TEXT_COLOR, NSForegroundColorAttributeName, DIMENSION_LINE_LABEL_BACKGROUND_COLOR, NSBackgroundColorAttributeName, nil];

    NSSize labelSize = [labelString sizeWithAttributes:attributes];

    NSRect labelRect = NSMakeRect(center.x - 0.5 * labelSize.width, center.y - 0.5 * labelSize.height, labelSize.width, labelSize.height);

    [labelString drawInRect:labelRect withAttributes:attributes];

}

void DrawHorizontalDimensionLine(CGFloat x1, CGFloat x2, CGFloat y) {

    // Stroke the line.

    NSBezierPath *path = [NSBezierPath bezierPath];

    [path setLineWidth:DIMENSION_LINE_THICKNESS];

    [path moveToPoint:NSMakePoint(x1, y)];

    [path lineToPoint:NSMakePoint(x2, y)];

    [DIMENSION_LINE_STROKE_COLOR set];

    // Stroke arrowheads (if line is long enough to bother).

    if (fabs(x2 - x1) >= 2.0 * DIMENSION_LINE_ARROW_SIDE_LENGTH) {

        // Stroke min end arrowhead.

        CGFloat minX = MIN(x1, x2);

        [path moveToPoint:NSMakePoint(minX + DIMENSION_LINE_ARROW_SIDE_LENGTH, y - DIMENSION_LINE_ARROW_SIDE_LENGTH)];

        [path lineToPoint:NSMakePoint(minX, y)];

        [path lineToPoint:NSMakePoint(minX + DIMENSION_LINE_ARROW_SIDE_LENGTH, y + DIMENSION_LINE_ARROW_SIDE_LENGTH)];        

        // Stroke max end arrowhead.

        CGFloat maxX = MAX(x1, x2);

        [path moveToPoint:NSMakePoint(maxX - DIMENSION_LINE_ARROW_SIDE_LENGTH, y - DIMENSION_LINE_ARROW_SIDE_LENGTH)];

        [path lineToPoint:NSMakePoint(maxX, y)];

        [path lineToPoint:NSMakePoint(maxX - DIMENSION_LINE_ARROW_SIDE_LENGTH, y + DIMENSION_LINE_ARROW_SIDE_LENGTH)];        

    }    

    [path stroke];

    // Draw a text box showing the dimension.

    DrawDimensionLineLabelAtCenterPoint(fabs(x2 - x1), NSMakePoint(0.5 * (x1 + x2), y));

}

void DrawVerticalDimensionLine(CGFloat y1, CGFloat y2, CGFloat x) {

    // Stroke the line.

    NSBezierPath *path = [NSBezierPath bezierPath];

    [path setLineWidth:DIMENSION_LINE_THICKNESS];

    [path moveToPoint:NSMakePoint(x, y1)];

    [path lineToPoint:NSMakePoint(x, y2)];

    [DIMENSION_LINE_STROKE_COLOR set];

    // Stroke arrowheads (if line is long enough to bother).

    if (fabs(y2 - y1) >= 2.0 * DIMENSION_LINE_ARROW_SIDE_LENGTH) {

        // Stroke min end arrowhead.

        CGFloat minY = MIN(y1, y2);

        [path moveToPoint:NSMakePoint(x - DIMENSION_LINE_ARROW_SIDE_LENGTH, minY + DIMENSION_LINE_ARROW_SIDE_LENGTH)];

        [path lineToPoint:NSMakePoint(x, minY)];

        [path lineToPoint:NSMakePoint(x + DIMENSION_LINE_ARROW_SIDE_LENGTH, minY + DIMENSION_LINE_ARROW_SIDE_LENGTH)];

        // Stroke max end arrowhead.

        CGFloat maxY = MAX(y1, y2);

        [path moveToPoint:NSMakePoint(x - DIMENSION_LINE_ARROW_SIDE_LENGTH, maxY - DIMENSION_LINE_ARROW_SIDE_LENGTH)];

        [path lineToPoint:NSMakePoint(x, maxY)];

        [path lineToPoint:NSMakePoint(x + DIMENSION_LINE_ARROW_SIDE_LENGTH, maxY - DIMENSION_LINE_ARROW_SIDE_LENGTH)];

    }    

    [path stroke];

    // Draw a text box showing the dimension.

    DrawDimensionLineLabelAtCenterPoint(fabs(y2 - y1), NSMakePoint(x, 0.5 * (y1 + y2)));

}