/*

File: WindowController.m

Abstract: Implements a window controller to recieve events from and

    dispatch state updates to the various view.

Version: 1.0

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*/

#import "WindowController.h"

#import "GradientView.h"

#import "ShadingView.h"

#import "PreviewView.h"

// Utility function to convert from NSColor to CGColorRef

CGColorRef CreateCGColorFromNSColor(NSColor * color)

{

    NSColor * rgbColor = [color colorUsingColorSpace:[NSColorSpace genericRGBColorSpace]];

    CGFloat r, g, b, a;

    [rgbColor getRed:&r green:&g blue:&b alpha:&a];

    return CGColorCreateGenericRGB(r, g, b, a);

}

// Some private methods for our window controller

@interface WindowController (private_methods)

-(void)recalculateGradients;

-(void)repositionGradients;

@end

@implementation WindowController

-(void)awakeFromNib

{

    // Center the window

    [[self window] center];

    // Request that the color panel show alpha

    [[NSColorPanel sharedColorPanel] setShowsAlpha:YES];

    // Initialize our CGColorRefs with the current color values from the nib

    color1 = CreateCGColorFromNSColor([colorWell1 color]);

    color2 = CreateCGColorFromNSColor([colorWell2 color]);

    color3 = CreateCGColorFromNSColor([colorWell3 color]);

    // Setup the gradients views.

    [self recalculateGradients];

    [self repositionGradients];

}

// Sets up the objects required to display the gradients

// and passes them to the gradient views.

-(void)recalculateGradients

{

    // Update the ShadingView

    // Create a new shading function with our current colors

    // and their starting locations

    CGFunctionRef colorFunction = CreateShadingFunction(

        color1, [colorStart1 doubleValue],

        color2, [colorStart2 doubleValue],

        color3, [colorStart3 doubleValue]);

    // Tell the shading view to use this new function

    [shadingView setShadingFunction:colorFunction];

    // The shading view will retain, so release.

    CGFunctionRelease(colorFunction);

    // Update the GradientView & PreviewView

    // Create a new gradient with our current colors

    // and their starting locaitons

    CGGradientRef gradient = CreateGradient(

        color1, [colorStart1 doubleValue],

        color2, [colorStart2 doubleValue],

        color3, [colorStart3 doubleValue]);

    // Tell the gradient & preview views to use this new function

    [gradientView setGradient:gradient];

    [previewView setGradient:gradient];

    // These views retain, so release.

    CGGradientRelease(gradient);

}

// When the start or end point or radii changes, we need to inform the views

// so that they can rerender.

-(void)repositionGradients

{

    CGPoint startPoint = CGPointMake([startX doubleValue], [startY doubleValue]);

    CGPoint endPoint = CGPointMake([endX doubleValue], [endY doubleValue]);

    CGFloat startRad = [startRadius doubleValue], endRad = [endRadius doubleValue];

    [shadingView setStartPoint:startPoint];

    [shadingView setStartRadius:startRad];

    [shadingView setEndPoint:endPoint];

    [shadingView setEndRadius:endRad];

    [gradientView setStartPoint:startPoint];

    [gradientView setStartRadius:startRad];

    [gradientView setEndPoint:endPoint];

    [gradientView setEndRadius:endRad];

}

// One of our color wells has changed, convert the color to a CGColorRef

// and rebuild the gradients.

- (IBAction)changeColor1:(id)sender

{

    CGColorRelease(color1);

    color1 = CreateCGColorFromNSColor([sender color]);

    [self recalculateGradients];

}

- (IBAction)changeColor2:(id)sender

{

    CGColorRelease(color2);

    color2 = CreateCGColorFromNSColor([sender color]);

    [self recalculateGradients];

}

- (IBAction)changeColor3:(id)sender

{

    CGColorRelease(color3);

    color3 = CreateCGColorFromNSColor([sender color]);

    [self recalculateGradients];

}

// One of the color starting locations has changed, so request

// that the gradients be recalculated.

- (IBAction)changeColor1Start:(id)sender

{

    [self recalculateGradients];

}

- (IBAction)changeColor2Start:(id)sender

{

    [self recalculateGradients];

}

- (IBAction)changeColor3Start:(id)sender

{

    [self recalculateGradients];

}

// The clipping shape has changed, so inform the views

// of the new shape to use.

- (IBAction)changeShape:(id)sender

{

    switch([sender selectedTag])

    {

        case 0: // Square

            [shadingView setShapeSquare];

            [gradientView setShapeSquare];

            break;

        case 1: // Circle

            [shadingView setShapeCircle];

            [gradientView setShapeCircle];

            break;

        case 2: // Filled Star

            [shadingView setShapeFilledStar];

            [gradientView setShapeFilledStar];

            break;

        case 3: // Hollow Star

            [shadingView setShapeHollowStar];

            [gradientView setShapeHollowStar];

            break;

    }

}

// The type of gradient has changed, so inform the

// views to use the new clipping shape.

// Additionally, hide or show the radii controls

// as appropriate to the new gradient type.

- (IBAction)changeType:(id)sender

{

    BOOL hideRadius = NO;

    switch([sender selectedTag])

    {

        case 0:

            [shadingView setTypeAxial];

            [gradientView setTypeAxial];

            hideRadius = YES;

            break;

        case 1:

            [shadingView setTypeRadial];

            [gradientView setTypeRadial];

            break;

    }

    [startRadiusLabel setHidden:hideRadius];

    [startRadius setHidden:hideRadius];

    [endRadiusLabel setHidden:hideRadius];

    [endRadius setHidden:hideRadius];

}

// Inform the views as to if they should render

// the gradients with extended start/end.

-(IBAction)changeExtendStart:(id)sender

{

    BOOL extend = [sender state] == NSOnState;

    [shadingView setExtendStart:extend];

    [gradientView setExtendStart:extend];

}

-(IBAction)changeExtendEnd:(id)sender

{

    BOOL extend = [sender state] == NSOnState;

    [shadingView setExtendEnd:extend];

    [gradientView setExtendEnd:extend];

}

// Inform the views that the start/end point/radii

// has been changed by the user.

-(IBAction)changeStartX:(id)sender

{

    [self repositionGradients];

}

-(IBAction)changeStartY:(id)sender

{

    [self repositionGradients];

}

-(IBAction)changeStartRadius:(id)sender

{

    [self repositionGradients];

}

-(IBAction)changeEndX:(id)sender

{

    [self repositionGradients];

}

-(IBAction)changeEndY:(id)sender

{

    [self repositionGradients];

}

-(IBAction)changeEndRadius:(id)sender

{

    [self repositionGradients];

}

// Handle one of the built in presents

-(IBAction)changePreset:(id)sender

{

    NSInteger type = 0;

    switch(@"%i", [[sender selectedItem] tag])

    {

        case 1: // Horizontal

            [startX setDoubleValue:0.0];

            [startY setDoubleValue:-0.9];

            [endX setDoubleValue:0.0];

            [endY setDoubleValue:0.9];

            break;

        case 2: // Vertical

            [startX setDoubleValue:-0.9];

            [startY setDoubleValue:0.0];

            [endX setDoubleValue:0.9];

            [endY setDoubleValue:0.0];

            break;

        case 3: // Diagonal

            [startX setDoubleValue:-0.9];

            [startY setDoubleValue:-0.9];

            [endX setDoubleValue:0.9];

            [endY setDoubleValue:0.9];

            break;

        case 4: // Toroidal

            [startX setDoubleValue:0.0];

            [startY setDoubleValue:0.0];

            [startRadius setDoubleValue:0.25];

            [endX setDoubleValue:0.0];

            [endY setDoubleValue:0.0];

            [endRadius setDoubleValue:0.75];

            type = 1;

            break;

        case 5: // Conical

            [startX setDoubleValue:0.0];

            [startY setDoubleValue:0.75];

            [startRadius setDoubleValue:0.05];

            [endX setDoubleValue:0.0];

            [endY setDoubleValue:-0.25];

            [endRadius setDoubleValue:0.45];

            type = 1;

            break;

    }

    [geometry selectCellWithTag:type];

    [self changeType:geometry];

    [self repositionGradients];

}

// Inform the gradient views

// that they should show or hide

// the clipping region (presented in light gray).

-(IBAction)changeShowClip:(id)sender

{

    [shadingView setShowClip:[sender state]];

    [gradientView setShowClip:[sender state]];

}

// Inform the gradient views

// that they should show or hide

// the end points, joining line, and radii circles

-(IBAction)changeShowEndpoints:(id)sender

{

    [shadingView setShowEndpoints:[sender state]];

    [gradientView setShowEndpoints:[sender state]];

}

@end