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With Canvas you can drive high impact visual communication right across your organisation, putting powerful data in the hands of the people who need it. Work with both raster and vector files; Import and visualize huge volumes of geospatial data; Manipulate and display intricate 3D models. Oct 28, 2018 The canvas has the methods ready to draw shapes, text, images, etc. Onto itself, and we'll see that in a bit. Note that the surface is wrapped in a using block. This is important as many classes in SkiaSharp inherit from IDisposable, which means they need to be disposed of after using them.
Let's get started. Open Visual Studio 2010/2012 and create a blank ASP.NET Website. Now add a page ‘default.aspx' to the site. Set it's target schema for validation as HTML 5 by going to Tools > Options > Text Editor > HTML > Validation. If you do not see the HTML 5 option, make sure you have installed Visual Studio 2010 Service Pack 1and Web Standards Update for Microsoft Visual Studio 2010 SP1.
Declare a HTML 5 canvas element of dimensions 400x400, add a Save button and an ASP.NET Image element to the form.
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We will draw some simple rectangles on this canvas using two functions – fillStyle and fillRectfillRect(float x, float y, float w, float h) – where x & y represent the upper-left corner of the rectangle and w & h represent the width and height of the rectangle you want.
fillStyle = 'rgba(R, G, B, V)' - we will fill color in this rectangle by using the fillStyle attribute. As you might have guessed, the RGB stand for red, green, and blue values (0–255) of the color you're creating. ‘V' represents the visibility factor 0 & 1, where 0 indicates invisibility, and 1 indicates visibility.
To draw graphics on a Canvas, you require a JavaScript API that HTML 5 provides. We will be using jQuery to do our client script. Declare the following JavaScript code inside the element of your page
src='https://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js'>
<br> $(function () { <br> var canvas = document.getElementById('canasp'); <br> var context = canvas.getContext('2d'); <br> });</span><br><span>
Note: $(function(){} ensures that code is run only after the Canvas element is fully loaded by the browser. This is better than built-in Javascript event
window.onload which has some quirks across browsers (FF/IE6/IE8/Opera) and waits for the entire page, including images to be loaded.
We will now use the fillRect() and fillStyle() function to draw two rectangles. Add this code below the context code
context.fillStyle = 'rgba(156, 170, 193, 1)';
context.fillRect(30, 30, 70, 90);
context.fillStyle = 'rgba(0, 109, 141, 1)';
context.fillRect(10, 10, 70, 90);
The code is pretty simple. We are passing some RGB values and drawing rectangles of width 70 px and height 90px. Check the definition above for fillStyle and fillRect to understand the code better.
Browse the page and you have two rectangles similar to the following:
If you want to save this drawing, you will have to set the source of an image object to the canvas data. From there, a user can right click on the image to save it to their local computer.
Saving Canvas Images to an ASP.NET Image Object
It's time to persist this masterpiece on your disk. To do so, we will use the Canvas element's toDataURL() method that returns a Base64-encoded string of the current pixels in the Canvas element. We will then set this string to the ASP.NET Image object source. Simple! Write the following code on the Save button click$('#btnSave').on('click', function (e) {
e.preventDefault();
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var imgData = canvas.toDataURL();//alert(imgData);
$('#<%=imgASP.ClientID %>')
.attr('src', imgData)
We will now use the fillRect() and fillStyle() function to draw two rectangles. Add this code below the context code
context.fillStyle = 'rgba(156, 170, 193, 1)';
context.fillRect(30, 30, 70, 90);
context.fillStyle = 'rgba(0, 109, 141, 1)';
context.fillRect(10, 10, 70, 90);
The code is pretty simple. We are passing some RGB values and drawing rectangles of width 70 px and height 90px. Check the definition above for fillStyle and fillRect to understand the code better.
Browse the page and you have two rectangles similar to the following:
If you want to save this drawing, you will have to set the source of an image object to the canvas data. From there, a user can right click on the image to save it to their local computer.
Saving Canvas Images to an ASP.NET Image Object
It's time to persist this masterpiece on your disk. To do so, we will use the Canvas element's toDataURL() method that returns a Base64-encoded string of the current pixels in the Canvas element. We will then set this string to the ASP.NET Image object source. Simple! Write the following code on the Save button click$('#btnSave').on('click', function (e) {
e.preventDefault();
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var imgData = canvas.toDataURL();//alert(imgData);
$('#<%=imgASP.ClientID %>')
.attr('src', imgData)
});
Run the code and hit Save. Now you will be able to save the image to your disk
A better way would be to be able to save the image directly to your server or your database. We will see how to do this in an upcoming article using jQuery.ajax and web methods.
The entire source code of this article can be downloaded at https://github.com/devcurry/save-canvas-image
I can understand why some - such as yourself - may find the canvas useful..
My comments were more tongue-in-cheek than literal :) just for the record I
would have no argument against the canvas being included in 2008 as long as
it can be regulated as an optional feature at the user's discretion.
Sendblaster 4 keygen. Glad you found the info useful.
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Regards |:>)
Bob Jones
[MVP] Office:Mac
On 6/3/07 6:15 AM, in article
0001HW.C288534103B7AE83B04A594F@News.Individual.Net, 'patrick j'
Shape Files In Canvas Draw For Mac 5 3
wrote:
Shape Files In Canvas Draw For Mac 5 0
> On Jun 2, 2007 CyberTaz wrote:
>
>> You're right in your observation - Mac Word doesn't employ the Drawing
>> Canvas. Interesting that you like it, though.. I personally hate the
>> miserable thing :) Just one more 'shape' you have to resize in addition to
>> the content within. But perhaps that's because I've gotten along for so many
>> years without it.
>>
>> Whether 2008 will bring the Drawing Canvas to the Mac is not known by anyone
>> who is at liberty to say:)
>
> Hi Bob
>
> Thanks for confirming that Word 2004 for the Mac doesn't have the Drawing
> Canvas.
>
> I use Word 2003 on a PC in work and so that is where I've encountered it.
> When I first discovered it my initial reaction was that it was horrid but
> I've come to really like it. It is for me very useful when putting together
> a group of graphic objects and doing some quite fine drawing.
>
> I've read your later post in this thread and I think I will configure my
> Word 2003 to not put the canvas in by default but put it in by myself using
> Insert menu. This is because the canvas is not necessary for putting in
> just one graphic and in those instances it just gets in the way.
>
> I would really like to see the inclusion of the Drawing Canvas in Word 2008
> personally.
