WindowController.m

/*
 
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