How to Implement WPF Canvas?

How to Implement WPF Canvas?

Canvas is a lightweight layout of WPF. Learn how to implement WPF Canvas. Canvas is used for 2D graphic design elements but not for UI. You can set the canvas in both ways statically and dynamically. If you want to set the canvas statically, then you can do it with.XAML file and if you want to set dynamically, then you can do it with .CS file.

What is canvas?

WPF has many layouts, among which the canvas is a popular one. Let us learn something about the canvas. It has some properties and methods. You can make an icon by using Canvas.Right, Canvas.Left, Canvas.Bottom and Canvas.Top coordinators and can make undefined controls.

Canvas is a lightweight layout of WPF. Canvas is used for 2D graphic design elements but not for UI. You cannot use it for making text-box, checkbox, or drop-down because it will create difficulty in screen resolution. Canvas has its height & width, so it cannot be re-sized automatically.

It allows you to put canvas into the canvas. That’s why it can only be used for making drawings. This was the main reason and that’s why developers are not using canvas for creating any controls like text-box, check-box, and Drop-Down. Despite having the support of these things in Canvas, the developer does not use it because of the screen resolution issue with canvas. Hence it is not considered as a UI element.

It has so many properties but the main properties are height and width, you have to set the height & width for the canvas but if you do not set these properties, then your canvas control view will not get created. Because it’s by default the height & width is zero (0). So if you do not set this, it will consider as zero and you cannot see the canvas control view. Thus, it is necessary to set the height and width of canvas control. Canvas has its properties which you can change dynamically as well.

You have to set the values for each property. That’s why, it is known as the simplest layout compare to other layouts like Grid, Stack panel and dock panel, etc.

You can set the canvas in both ways statically and dynamically. If you want to set the canvas statically, then you can do it with.XAML file and if you want to set dynamically, then you can do it with .CS file. We will see the example next.

Now let’s see the common and more used properties of the canvas. By using the canvas properties, you can make a square, triangle, and rectangle. You can make many things by setting the coordinators with some properties.

Properties of the canvas are as follows.

  1. Height & width
  2. Margin
  3. Background
  4. Name
  5. Zindex

1. Height & width

This is one of the main properties of the canvas.

You can set the value whatever you want to design time. You can also change the value through .cs file you can set other properties like min-height, max-height, min-width and max-width.

If you want to check the canvas for the run-time, then you can check it by setting the actual height & actual width

example

<canvas height=”20” width=”30”>

..

</canvas>

2. Margin

Thus, the property of canvas is used for how much space you want to keep from the left or right. It is used for design purpose. You have to set numeric values for this property which you can set in 3 different ways

1. <canvas margin=”10”>

2. <canvas margin=”10 20”>

3. <canvas margin=”10 5 10 5”>

3.1 <canvas margin=”10”>

It will leave equal space from left, right, top, and bottom.

3.2 <canvas margin=”10 20”>

In this, there are two parameters the first parameter is for left & right and the second parameter is for top and bottom. So the first parameter is 10 which will leave space from left & right, and the second parameter 20 which will leave space from the top & bottom

<canvas margin=”10 20”>

3.3 <canvas margin=”10 20 15 25”>

10 which will set margin for left

20 which will set margin for the top

15 which will set margin for right

25 which will set margin for bottom

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