At first, I had a hard time grasping the purpose and use of the
save()
and restore()
methods of the canvas’ 2d context. It’s really very simple and here are some examples that can help you understand it better.- Shape Files In Canvas Draw For Mac 5 0
- Canvas App For Mac
- Deneba Canvas Drawing Software
- Smartdraw For Mac
- Canvas Drawing Program
Shape Files In Canvas Draw For Mac 5 0
In this article we are going to understand horizontal and vertical dragging using the HTML 5 canvas. In this section, drag and drop the the yellow rectangle and observe that it can only move horizontally. Drag and drop the white rectangle and observe that it can only move vertically while the application is running in the browser.
Let’s look at an official definition of
save()
and restore()
- When you insert a drawing object, the Drawing Canvas is created automatically. However, the bad news is that you will see that MOST of the capability for drawing has been removed from Word 2011. I agree with you, in normal corporate work, I can find no use for the stuff in the SmartArt tab, but I use the old drawing tools constantly.
- One of the limitations of shapes in HTML 5 canvas is that only one fill rule is supported, which can lead to shapes not appearing correctly when you want to convert from another format that supports multiple fill rules to HTML 5, as we do for our PDF to HTML5 Converter.
- The Canvas is a rectangular area intended for drawing pictures or other complex layouts. You can place graphics, text, widgets or frames on a Canvas. A tuple (w, n, e, s) that defines over how large an area the canvas can be scrolled, where w is the left side, n the top, e the right side, and s the.
- May 20, 2019 The 5.0.2.51.0 version of Canvas Draw for Mac is available as a free download on our software library. This software for Mac OS X is a product of ACD Systems International Inc. The size of the latest downloadable setup file is 214.5 MB.
Each context maintains a stack of drawing states. Drawing states consist of:
* The current transformation matrix.
* The current clipping region.
* The current values of the following attributes: strokeStyle, fillStyle, globalAlpha, lineWidth, lineCap, lineJoin, miterLimit, shadowOffsetX, shadowOffsetY, shadowBlur, shadowColor, globalCompositeOperation, font, textAlign, textBaseline.
The current path and the current bitmap are not part of the drawing state. The current path is persistent, and can only be reset using the beginPath() method. The current bitmap is a property of the canvas, not the context.
context.save() Pushes the current state onto the stack.
Canvas App For Mac
context.restore() Pops the top state on the stack, restoring the context to that state.
Since a canvas can only have one 2d context, Save and restore can be used as a solution to a wide variety of situations. One of the most common uses is for transformations.
An example of how save() and restore() help with transformations.
When you perform a transformation, the entire context’s coordinate system is transformed. After transforming, you often want the coordinate system to be back to normal for your next step. Reversing the transformation by using another transformation is a dicey affair and can easily introduce small errors that add up quickly. It’s easier to simply save the normal starting coordinate system as a saved drawing state and then after we do our transformation and wish to have a normal coordinate system as opposed to our newly transformed one, we simply restore the state we saved before transforming. Got it? LOL. Here’s some pictures to make it clearer.
We start with our normal coordinate system and call canvascontext.save() to push a copy of our current drawing state onto our drawing state stack.
Then we transform our context.
Draw our transformed shape on it. canvascontext.fillRect(1,1,2,2)
Omnisphere 2 response code generator. Now we want to draw more shapes but we don’t want the current transformations to apply so we call restore() and pop the last saved drawing state off of the drawing state stack.
Deneba Canvas Drawing Software
Notice that the shapes did not change, just the drawing state as it applies to future drawing.
Super simple example
Smartdraw For Mac
Here is a super simple example to illustrate how the drawing state stack works with save() and restore().
First, the source code listing so you can play around with it. This example is coded for readability and not for optimized operation. Swathi chinukulu serial story. All you need is a text editor like notepad and an HTML5 friendly browser (I’m using Firefox 3.6).
You can copy this code and paste it into a new file called something like saverestore.html and when you open it with an HTML5 friendly browser like Firefox 3.6 it will display the canvas.
Canvas Drawing Program
First we draw a rectangle setting the fillStyle and shadow properties for our shape. Then we call
ctx.save()
which adds our settings to the stack.Then we draw another rectangle setting the fillStyle and shadow properties for our shape and call
ctx.save()
which adds our settings to the stack.And we draw another rectangle setting the fillStyle and shadow properties for our shape. Then we call
ctx.save()
which adds our settings to the stack.Now we call
ctx.restore()
and pop the settings off of the top of our stack and we draw a circle using those settings.Another call to
ctx.restore()
pops the next settings off of the top of our stack and we draw a circle using those settings.And a final call to
ctx.restore()
pops the next settings off of the top of our stack and we draw a circle using those settings.If you have any questions or corrections, please leave a comment.