如何绘制图形？ -Xamarin

Question

I am trying to create a graphic in the middle of my layout, which can be restricted in a Linearlayout. Example => Print App This is my application and the graphic has to be in the white area written "Diagram".

The graphic only needs lines and bezier curves.

in fact I do not know if it has a specific object where I can draw. with lines (x1, y1, x2, y2).

public class MyView : View
{
    protected override void OnDraw(Canvas canvas)
    {
        base.OnDraw(canvas);
        Paint green = new Paint {
            AntiAlias = true,
            Color = Color.Rgb(0x99, 0xcc, 0),
        };
        green.SetStyle(Paint.Style.FillAndStroke);

        Paint red = new Paint {
            AntiAlias = true,
            Color = Color.Rgb(0xff, 0x44, 0x44)
        };
        red.SetStyle(Paint.Style.FillAndStroke);

        float middle = canvas.Width * 0.25f;
        canvas.DrawPaint(red);
        canvas.DrawRect(0, 0, middle, canvas.Height, green);
    }
}

How do I draw this in a specific place in my layout?

Answer 1

How do I draw this in a specific place in my layout?

After you've complete your draw view MyView , you can place it in your layout in xml for example like this:

<YOURNAMESPACE.MyView android:layout_height="wrap_content"
                      android:layout_width="wrap_content"
                      android:id="@+id/myview" />

In this case, it can be used like normal UI components in the layout, means you can use Margin , Gravity and such layout parameters to certain the location where it should be placed.

If you want to implement it in the code behind, you can use LayoutParams . Specific layout code depends on which parent view are you using.

Basically it means, you can draw the view use Paint in the subclass of View and place it like a UI components in your layout.