本文整理汇总了C#中CGBitmapContext.DrawLayer方法的典型用法代码示例。如果您正苦于以下问题：C# CGBitmapContext.DrawLayer方法的具体用法？C# CGBitmapContext.DrawLayer怎么用？C# CGBitmapContext.DrawLayer使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类CGBitmapContext的用法示例。
在下文中一共展示了CGBitmapContext.DrawLayer方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: DrawCoordinateSpace
/// <summary>
/// Draws our coordinate grid
/// </summary>
protected void DrawCoordinateSpace (CGBitmapContext context)
{
// declare vars
int remainder;
int textHeight = 20;
#region -= vertical ticks =-
// create our vertical tick lines
using (CGLayer verticalTickLayer = CGLayer.Create (context, new CGSize (20, 3))) {
// draw a single tick
verticalTickLayer.Context.FillRect (new CGRect (0, 1, 20, 2));
// draw a vertical tick every 20 pixels
float yPos = 20;
nint numberOfVerticalTicks = ((context.Height / 20) - 1);
for (int i = 0; i < numberOfVerticalTicks; i++) {
// draw the layer
context.DrawLayer (verticalTickLayer, new CGPoint (0, yPos));
// starting at 40, draw the coordinate text nearly to the top
if (yPos > 40 && i < (numberOfVerticalTicks - 2)) {
// draw it every 80 points
Math.DivRem ((int)yPos, (int)80, out remainder);
if (remainder == 0)
DrawTextAtPoint (context, 30, (yPos - (textHeight / 2)), yPos.ToString (), textHeight);
}
// increment the position of the next tick
yPos += 20;
}
}
#endregion
#region -= horizontal ticks =-
// create our horizontal tick lines
using (CGLayer horizontalTickLayer = CGLayer.Create (context, new CGSize (3, 20))) {
horizontalTickLayer.Context.FillRect (new CGRect (1, 0, 2, 20));
// draw a horizontal tick every 20 pixels
float xPos = 20;
nint numberOfHorizontalTicks = ((context.Width / 20) - 1);
for (int i = 0; i < numberOfHorizontalTicks; i++) {
context.DrawLayer (horizontalTickLayer, new CGPoint (xPos, 0));
// starting at 100, draw the coordinate text nearly to the top
if (xPos > 100 && i < (numberOfHorizontalTicks - 1)) {
// draw it every 80 points
Math.DivRem ((int)xPos, (int)80, out remainder);
if (remainder == 0)
DrawCenteredTextAtPoint (context, xPos, 30, xPos.ToString (), textHeight);
}
// increment the position of the next tick
xPos += 20;
}
}
#endregion
// draw our "origin" text
DrawTextAtPoint (context, 20, (20 + (textHeight / 2)), "Origin (0,0)", textHeight);
}示例2: ViewDidLoad
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
// set the background color of the view to white
View.BackgroundColor = UIColor.White;
// instantiate a new image view that takes up the whole screen and add it to
// the view hierarchy
RectangleF imageViewFrame = new RectangleF (0, -NavigationController.NavigationBar.Frame.Height, View.Frame.Width, View.Frame.Height);
imageView = new UIImageView (imageViewFrame);
View.AddSubview (imageView);
// create our offscreen bitmap context
// size
SizeF bitmapSize = new SizeF (View.Frame.Size);
using (CGBitmapContext context = new CGBitmapContext (IntPtr.Zero
, (int)bitmapSize.Width, (int)bitmapSize.Height, 8
, (int)(4 * bitmapSize.Width), CGColorSpace.CreateDeviceRGB ()
, CGImageAlphaInfo.PremultipliedFirst))
{
// declare vars
int remainder;
int textHeight = 20;
#region -= vertical ticks =-
// create our vertical tick lines
using (CGLayer verticalTickLayer = CGLayer.Create (context, new SizeF (20, 3))) {
// draw a single tick
verticalTickLayer.Context.FillRect (new RectangleF (0, 1, 20, 2));
// draw a vertical tick every 20 pixels
float yPos = 20;
int numberOfVerticalTicks = ((context.Height / 20) - 1);
for (int i = 0; i < numberOfVerticalTicks; i++) {
// draw the layer
context.DrawLayer (verticalTickLayer, new PointF (0, yPos));
// starting at 40, draw the coordinate text nearly to the top
if (yPos > 40 && i < (numberOfVerticalTicks - 2)) {
// draw it every 80 points
Math.DivRem ( (int)yPos, (int)80, out remainder);
if (remainder == 0)
ShowTextAtPoint (context, 30, (yPos - (textHeight / 2)), yPos.ToString (), textHeight);
}
// increment the position of the next tick
yPos += 20;
}
}
#endregion
#region -= horizontal ticks =-
// create our horizontal tick lines
using (CGLayer horizontalTickLayer = CGLayer.Create (context, new SizeF (3, 20))) {
horizontalTickLayer.Context.FillRect (new RectangleF (1, 0, 2, 20));
// draw a horizontal tick every 20 pixels
float xPos = 20;
int numberOfHorizontalTicks = ((context.Width / 20) - 1);
for (int i = 0; i < numberOfHorizontalTicks; i++) {
context.DrawLayer (horizontalTickLayer, new PointF (xPos, 0));
// starting at 100, draw the coordinate text nearly to the top
if (xPos > 100 && i < (numberOfHorizontalTicks - 1)) {
// draw it every 80 points
Math.DivRem ((int)xPos, (int)80, out remainder);
if (remainder == 0)
ShowCenteredTextAtPoint (context, xPos, 30, xPos.ToString (), textHeight);
}
// increment the position of the next tick
xPos += 20;
}
}
#endregion
// draw our "origin" text
ShowTextAtPoint (context, 20, (20 + (textHeight / 2)), "Origin (0,0)", textHeight);
#region -= points =-
// (250,700)
context.FillEllipseInRect (new RectangleF (250, 700, 6, 6));
ShowCenteredTextAtPoint (context, 250, 715, "(250,700)", textHeight);
// (500,300)
context.FillEllipseInRect (new RectangleF (500, 300, 6, 6));
ShowCenteredTextAtPoint (context, 500, 315, "(500,300)", textHeight);
#endregion
// output the drawing to the view
//.........这里部分代码省略.........