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HTML canvas making blurry shapes


HTML canvas making blurry shapes

By : user2953116
Date : November 20 2020, 01:01 AM
I wish did fix the issue. Don't set the canvas's size through CSS, that stretches the canvas element, instead of actually making the canvas larger.
Use HTML attributes, instead:
code :
<canvas id="canvas" width="500" height="500"></canvas>
var canvas = document.getElementById("canvas");
canvas.width  = window.innerWidth;
canvas.height = window.innerHeight;
var ctx=canvas.getContext("2d");
// etc...


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HTML Blurry Canvas Images

HTML Blurry Canvas Images


By : Nambi SVK
Date : March 29 2020, 07:55 AM
help you fix your problem If the canvas width and height is set via CSS it results in a blurry image result. TO get around this I had to set the width and height via html attributes. Now I have a wonderful cropping solution that can save images via AJAX. Crisp and Clear:)
code :
<canvas id="preview" width="400" height="200"></canvas>
Drawing flat shapes on HTML canvas creates blurry borders

Drawing flat shapes on HTML canvas creates blurry borders


By : J.Chuan
Date : March 29 2020, 07:55 AM
should help you out probably just set the canvas.width and canvas.height to the same values you got the css style. when some elements get scaled by css they normally get antialias (canvas and images).
code :
image-rendering: auto;
image-rendering: crisp-edges;
image-rendering: pixelated;
How can I scale the HTML5 canvas without making it blurry?

How can I scale the HTML5 canvas without making it blurry?


By : David Ako
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Canvas CSS properties do not resize canvas, they rescale it.
You may simply change the properties with your JS:
code :
$("#canvas")
    .prop("width", window.innerWidth)
    .prop("height", window.innerHeight); 
Making many shapes on tkinter canvas that can be modified later

Making many shapes on tkinter canvas that can be modified later


By : André
Date : March 29 2020, 07:55 AM
this will help I recommend changing box into a class. That will make it much easier to treat each "box" as an object, and each object will have a namespace for keeping its own metadata. This is precisely the type of problem classes are designed to solve.
In the following example, each arc in the "box" gets two tags. One is "arc" in case you want to be able to change all arcs of all boxes at once, and one is a tag unique to each box, for configuring all of the arcs at once for a single box.
code :
class Box():
    def __init__(self, canvas, coords):
        self.canvas = canvas
        self.tag = "box-{}".format(id(self))
        tags = ("arc", self.tag)
        self.arcs = [
            canvas.create_arc(coords, start=0, extent=90, style="arc", tags=tags),
            canvas.create_arc(coords, start=90, extent=90, style="arc", tags=tags),
            canvas.create_arc(coords, start=180, extent=90, style="arc", tags=tags),
            canvas.create_arc(coords, start=270, extent=90, style="arc", tags=tags),
    ]
box1 = Box(canvas, (100, 50, 200, 150))
box2 = Box(canvas, (100 + 100, 50, 200 + 100, 150))
canvas.itemconfigure("arc", width=5, fill="yellow")
canvas.itemconfigure(box1.tag, outline='red')
canvas.itemconfigure(box2.arcs[0], outline="green")
canvas.tag_bind("arc", "<Button-1>", bold)
Making a Canvas object draw different shapes when different buttons are clicked?

Making a Canvas object draw different shapes when different buttons are clicked?


By : karen yeo
Date : March 29 2020, 07:55 AM
will help you Add a MouseListener to the canvas, and in the mouseClicked() method of the listener, change the state of the objects painted by the canvas, and call the canvas repaint() method in order for the canvas to repaint itself, based on the modified state.
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