//
// Helper function to generate shadow
//
private void GenerateShapeShadow(CGContext context, UIBezierPath shapeObject, nfloat xOffset, nfloat yOffset, nfloat blurValue, CGBlendMode blendingMode, UIColor shadowColor, nfloat borderWidth, int borderPosition, nfloat iWidth, nfloat iHeight)
{
CGPoint basePoint;
CGPoint offsetPoint;
CGSize calculatedShadowOffset;
nfloat calculatedShadowBlur;
CGPoint constPointZero;
constPointZero = new CGPoint(0, 0);
basePoint = baseTransform.TransformPoint(context.PointToDeviceSpace(constPointZero));
offsetPoint = baseTransform.TransformPoint(context.PointToDeviceSpace(new CGPoint(xOffset, yOffset)));
calculatedShadowOffset = new CGSize(offsetPoint.X - basePoint.X, offsetPoint.Y - basePoint.Y);
if (blurValue == 0)
{
calculatedShadowBlur = 0;
}
else
{
calculatedShadowBlur = Hypot(calculatedShadowOffset.Width, calculatedShadowOffset.Height) / blurValue;
}
context.SetShadow(calculatedShadowOffset, calculatedShadowBlur, shadowColor.CGColor);
context.SetBlendMode(blendingMode);
context.BeginTransparencyLayer(null);
UIColor.Black.SetFill();
shapeObject.Fill();
if (borderWidth > 0)
{
if (borderPosition == 0)
{
context.SaveState();
shapeObject.LineWidth = borderWidth;
UIColor.Black.SetStroke();
shapeObject.Stroke();
context.RestoreState();
}
if (borderPosition == 1)
{
context.BeginPath();
context.AddPath(shapeObject.CGPath);
context.EOClip();
}
if (borderPosition == 2)
{
context.BeginPath();
context.AddPath(shapeObject.CGPath);
context.AddRect(RectangleFExtensions.Inset(shapeObject.Bounds, iWidth, iHeight));
context.EOClip();
}
}
context.EndTransparencyLayer();
}
void DrawBackground(CGRect rect, CGContext context, CGColor color, UIBezierPath roundedRectanglePath)
{
context.SaveState();
context.BeginTransparencyLayer(null);
if (roundedRectanglePath != null)
{
roundedRectanglePath.AddClip();
}
context.SetFillColor(color);
context.FillRect(rect);
context.EndTransparencyLayer();
context.RestoreState();
}
// http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_shadings/dq_shadings.html#//apple_ref/doc/uid/TP30001066-CH207-BBCECJBF
internal override void Setup(Graphics graphics, bool fill)
{
CGContext context = graphics.context;
// if fill is false then we are being called from a Pen stroke so
// we need to setup a transparency layer
// http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_shadings/dq_shadings.html#//apple_ref/doc/uid/TP30001066-CH207-BBCECJBF
if (!fill)
{
context.BeginTransparencyLayer();
hasTransparencyLayer = true;
// Make sure we set a color here so that the gradient shows up
graphics.lastBrushColor = Color.Black;
return;
}
// if this is the same as the last that was set and no changes have been made
// then return.
if (graphics.LastBrush != this || changed)
{
//setupShadingColors();
}
// Transform the start and end points using the brush's transformation matrix
gradientTransform.TransformPoints(pathPoints);
RasterizePolygon(context, centerPoint, pathPoints, surroundColors, centerColor);
// If we are in a Transparency layer then we need to end the transparency
if (hasTransparencyLayer)
{
context.EndTransparencyLayer();
}
changed = false;
graphics.LastBrush = this;
// We will reset the last pen so that it can be setup again
// so that we do not loose the settings after stroking the gradient
// not sure where the setting are being reset so this may be a hack
// and things are just not being restored correctly.
graphics.LastPen = null;
// I am setting this to be used for Text coloring in DrawString
graphics.lastBrushColor = surroundColors[surroundColors.Length - 1];
}
// http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_shadings/dq_shadings.html#//apple_ref/doc/uid/TP30001066-CH207-BBCECJBF
internal override void Setup(Graphics graphics, bool fill)
{
CGContext context = graphics.context;
// if fill is false then we are being called from a Pen stroke so
// we need to setup a transparency layer
// http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_shadings/dq_shadings.html#//apple_ref/doc/uid/TP30001066-CH207-BBCECJBF
if (!fill)
{
context.BeginTransparencyLayer();
hasTransparencyLayer = true;
// Make sure we set a color here so that the gradient shows up
graphics.lastBrushColor = Color.Black;
return;
}
// if this is the same as the last that was set and no changes have been made
// then return.
if (graphics.LastBrush != this || changed)
{
setupShadingColors();
}
CGSize gradientRegionCg = context.GetClipBoundingBox().Size;
SizeF gradientRegion = new SizeF((float)gradientRegionCg.Width, (float)gradientRegionCg.Height);
// SizeF gradientRegionPath = context.GetPathBoundingBox().Size;
PointF sp = startPoint;
PointF ep = endPoint;
PointF[] points = { sp, ep };
// Transform the start and end points using the brush's transformation matrix
gradientTransform.TransformPoints(points);
sp = points[0];
ep = points[1];
var cgf = CyclicGradientFunction(gradientRegion,
ref sp, ref ep);
var colorSpace = CGColorSpace.CreateDeviceRGB();
CGPoint cgsp = new CGPoint(sp.X, sp.Y), cgep = new CGPoint(ep.X, ep.Y);
var shading = CGShading.CreateAxial(colorSpace, cgsp, cgep, cgf, false, false);
colorSpace.Dispose();
context.SaveState();
// if path is empty here then we are being called from a Pen stroke so
// we set the blend mode for strokes and clip the path for fills
if (!context.IsPathEmpty())
{
context.Clip();
}
else
{
context.SetBlendMode(CGBlendMode.SourceIn);
}
context.DrawShading(shading);
context.RestoreState();
// If we are in a Transparency layer then we need to end the transparency
if (hasTransparencyLayer)
{
context.EndTransparencyLayer();
}
cgf.Dispose();
shading.Dispose();
shading = null;
changed = false;
graphics.LastBrush = this;
// We will reset the last pen so that it can be setup again
// so that we do not loose the settings after stroking the gradient
// not sure where the setting are being reset so this may be a hack
// and things are just not being restored correctly.
graphics.LastPen = null;
// I am setting this to be used for Text coloring in DrawString
graphics.lastBrushColor = colors[0];
}
public override void Draw(CGRect area)
{
if (image == null)
{
return;
}
CGContext context = UIGraphics.GetCurrentContext();
//
//-----------------------------------------------------------
// Draw bottom layer containing image preview
//-----------------------------------------------------------
//
if (layerBottom == null)
{
CGLayer layer = CGLayer.Create(context, this.Bounds.Size);
CGContext layerContext = layer.Context;
layerContext.SetFillColor(this.BackgroundColor.CGColor);
layerContext.FillRect(this.Bounds);
CGAffineTransform transform = new CGAffineTransform(1, 0, 0, -1, 0, this.Bounds.Size.Height);
layerContext.ConcatCTM(transform);
layerContext.DrawImage(WholeImageRectInView(), image.CGImage);
layerBottom = layer;
}
context.DrawLayer(layerBottom, new CGPoint(0, 0));
//-----------------------------------------------------------
// Draw transparency layer containing edges around page area
//-----------------------------------------------------------
{
CGPoint[] point = new CGPoint[4];
GetCornersCoordinates(point, false);
// Preserve the current drawing state
context.SaveState();
context.BeginTransparencyLayer(null);
context.SetLineWidth(1.0f);
context.SetStrokeColor(0.0f, 0.0f, 1.0f, 1.0f);
//-----------------------------------------------------------------
// Create complex path as intersection of subpath 1 with subpath 2
//-----------------------------------------------------------------
// Create subpath 1 with the whole image size
context.SetFillColor(0, 0, 0, 0.4f);
context.AddRect(this.Bounds);
// Create subpath 2 which cuts a page area from the subpath 1
context.MoveTo(point[0].X, point[0].Y);
context.AddLineToPoint(point[1].X, point[1].Y);
context.AddLineToPoint(point[3].X, point[3].Y);
context.AddLineToPoint(point[2].X, point[2].Y);
context.AddLineToPoint(point[0].X, point[0].Y);
context.EOFillPath();
//-----------------------------------------------------------------
// Create a new path which draws edges around page area
//-----------------------------------------------------------------
// Draw edge around page
context.SetFillColor(0, 0, 1, 1);
context.BeginPath();
context.MoveTo(point[0].X, point[0].Y);
context.AddLineToPoint(point[1].X, point[1].Y);
context.AddLineToPoint(point[3].X, point[3].Y);
context.AddLineToPoint(point[2].X, point[2].Y);
context.AddLineToPoint(point[0].X, point[0].Y);
context.StrokePath();
context.EndTransparencyLayer();
// Restore the previous drawing state.
context.RestoreState();
}
}
