public Canvas(RectangleF frame, UIInterfaceOrientation orientation, Crayon [] crayons, List<UIImage> swatches)
: base(frame)
{
this.orientation = orientation;
this.crayons = crayons;
this.swatches = swatches;
BackgroundColor = UIColor.White;
}
public override void LoadView()
{
base.LoadView ();
//get the latest selected crayon
foreach (var crayon in Application.Crayons) {
if(crayon.Selected)
selectedCrayon = crayon;
}
//load our swatches (transparent, colorless pngs that we then add color to, and use as a textured brush)
var swatchesDirectory = Path.Combine (NSBundle.MainBundle.BundlePath, "Swatches");
swatches = new List<UIImage>();
foreach (var swatchFile in Directory.EnumerateFiles (swatchesDirectory)) {
var swatch = UIImage.FromFile (swatchFile);
if (swatch == null) {
Application.Log ("WARN: couldn't load swatch: {0}", swatchFile);
continue;
}
swatches.Add(swatch);
}
//make our brush size slider
swatchSlider = new UISlider(new RectangleF(50, 30, 250, 50));
swatchSlider.MinValue = 1;
swatchSlider.MaxValue = 40;
swatchSlider.Value = 10;
swatchSlider.MinimumTrackTintColor = UIColor.FromRGB(selectedCrayon.R/255f, selectedCrayon.G/255f, selectedCrayon.B/255f);
swatchSlider.MaximumTrackTintColor = UIColor.LightGray;
//generate our clear and save buttons
//TODO: this should happen in a split-view, so the user can show and hide
redoButton = UIButton.FromType(UIButtonType.RoundedRect);
saveButton = UIButton.FromType(UIButtonType.RoundedRect);
redoButton.Frame = new RectangleF(100, 825, 200, 100);
saveButton.Frame = new RectangleF(400, 825, 200, 100);
redoButton.SetTitle ("Start Over", UIControlState.Normal);
saveButton.SetTitle ("I'm Done!", UIControlState.Normal);
redoButton.TouchUpInside += ClearCanvas;
saveButton.TouchUpInside += SaveAsImage;
//TODO: manage slider position wrt screen orientation
canvas = new Canvas (UIScreen.MainScreen.ApplicationFrame, InterfaceOrientation, Application.Crayons, swatches);
canvas.Background = image;
canvas.swatchSlider = swatchSlider;
canvas.AddSubviews (swatchSlider, redoButton, saveButton);
//load this puppy
View = canvas;
}
public static void SaveCrayons(string fileName, Crayon [] crayons)
{
using (var stream = File.Create (fileName))
Serializer.Serialize (stream, crayons);
}
void DrawCrayon(CGContext context, Crayon crayon)
{
// I <3 Paintcode
//// Color Declarations
var gradientColor = UIColor.FromRGBA(crayon.R / 255f, crayon.G / 255f, crayon.B / 255f, 1.00f);
var gradientColor2 = UIColor.FromRGBA(crayon.R / 255f, crayon.G / 255f, crayon.B / 255f, 0.69f);
var gradientColor3 = UIColor.FromRGBA(crayon.R / 255f, crayon.G / 255f, crayon.B / 255f, 0.37f);
//// Gradient Declarations
var gradientColors = new CGColor [] {
gradientColor.CGColor,
gradientColor2.CGColor,
gradientColor3.CGColor,
gradientColor2.CGColor,
gradientColor.CGColor
};
var gradientLocations = new float [] {0, 0.37f, 0.66f, 1, 1};
var gradient = new CGGradient(colorSpace, gradientColors, gradientLocations);
//// Rectangle Drawing
var rectanglePath = UIBezierPath.FromRoundedRect(new RectangleF(0.5f, 20.5f, 25, 100), UIRectCorner.TopLeft | UIRectCorner.TopRight, new SizeF(8, 8));
context.SaveState();
rectanglePath.AddClip();
context.DrawLinearGradient(gradient, new PointF(0.5f, 70.5f), new PointF(25.5f, 70.5f), 0);
context.RestoreState();
//// Bezier Drawing
UIBezierPath bezierPath = new UIBezierPath();
bezierPath.MoveTo(new PointF(3.5f, 24.5f));
bezierPath.AddCurveToPoint(new PointF(12, 0.09f), new PointF(6.5f, 17.57f), new PointF(9.79f, -4.27f));
bezierPath.AddCurveToPoint(new PointF(22.5f, 24.5f), new PointF(16.3f, 8.57f), new PointF(22.5f, 24.5f));
context.SaveState();
bezierPath.AddClip();
context.DrawLinearGradient(gradient, new PointF(3.5f, 12.01f), new PointF(22.5f, 12.01f), 0);
context.RestoreState();
}
public override void TouchesMoved(NSSet touchSet, UIEvent evt)
{
var touches = touchSet.ToArray<UITouch> ();
if (touchedCrayon != null) {
if (touches.All (touch => GetTouchingCrayon (touch) == null))
touchedCrayon = null;
return;
}
AddPoint (touches);
}
/******Touches******/
public override void TouchesBegan(NSSet touchSet, UIEvent evt)
{
var touches = touchSet.ToArray<UITouch> ();
foreach (var touch in touches) {
touchedCrayon = GetTouchingCrayon (touch);
if (touchedCrayon != null)
return;
}
AddPoint (touches);
}