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Canvas draws a line chart of a smooth curve
write a line chart with native JS, right-angled ones can be written, but now you need to change into a smooth curve, similar to:
the inflection point is still at a right angle, is there any god who can provide the next solution
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How to move the entire queue and depict it with canvas.
to complete the following effect diagram, the move: method cannot achieve the desired automatic movement at the speed shift 2,
.
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How to realize the undo function of drawing on canvas
the only thing I can think of now is to save the current canvas to an array every time I finish drawing, and then take it out of the array when I undo it ...
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I would like to ask canvas to draw multiple small balls that collide with each other, how to add events to each small ball?
canvas draws multiple ball collisions on the canvas. How can I add a click event to the ball?
as far as I know, adding an event to the canvas actually gets an area on the canvas to fix an event? Is it true that the ball can not be added if it keeps ch...
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The rubber sassafras function is realized on the canvas background image without destroying the background image.
and then realize the painting function on the canvas of the background map, such as drawing a circle and so on. I want to make a rubber Sassafras function, which can remove part of the circle without affecting the background image. How can this be realiz...
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Combined use of globalCompositeOperation and putImageData () in H5 canvas
get the target image from the background canvas through the getImageData () method, which is square. Now you want to make the square into a jigsaw puzzle .
s r
ctx_ceng.beginPath();
ctx_ceng.moveTo(0, cY...
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Draw icons on canvas
as shown in the picture, draw a picture with canvas. now add an arrow icon pedestrian icon to the diagram. The icon can be changed in different colors (red, yellow, green and gray) consult the implementation plan
the method that comes to mind so f...
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How do you achieve a particle effect like this?
first post the link https: www.hotsarstore.com home like the effect of the home page, 1, mouse skimming and so on to show 2, hair effect? How to describe 3, Light and Shadow Movement Please ...
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Canvas drawing Catton
The problem is that canvas users draw graphics when they touchstart touchmove. Because I call the drawing method in touchmove, now there will be a little stutter when I come across a phone with poor performance. Is there any good solution? What I m thi...
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Can canvas move the picture directly without clearing the canvas?
online check seems to be through the removal of the canvas, re-painted, so can you directly move without cleaning the previous canvas. ...
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Error copying previous path to another canvas by canvas
problem description
redraw the contents of the first artboard to the first artboard in figure 2 through the recording track, and there is a problem
the environmental background of the problems and what methods you have tried
related codes
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How to remove the border left by canvas drawing a round picture (Mini Program)?
as shown below, using the shared image generated by canvasAPI provided by Mini Program, you can only see the QR code part of the circle image. You can draw a circle image after using ctx.clip and then using ctx.drawImg. But what to do with the remaining...
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Mini Program canvas characters cannot be bold
Mini Program draws the text with canvas, and sets the text to be bold but does not respond. The code is as follows
ctx.font=`50px bold`
ctx.fillText("",0,0)
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Why is drawing a picture on canvas much larger than the set size?
original image size: 750x1334 canvas size: 750X1334 I m going to lay a 750x1334 picture as the background on the canvas of 750x1334.
the code is as follows:
var image = new Image()
image.src = img background.png
image.onload = drawImg ...
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A js graphic Segmentation algorithm
it is known that a polygon consists of n squares of the same size (this polygon is not necessarily a rectangle, but it must be a figure made up of squares). To cut this figure, you can only cut from the edge of each square. When you click submit, you can...
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How does canvas penetrate the dom element below?
for example, this page has a penetrating click: http: animejs.com
canvas at the top, mouse clicks will animate, but this will cover the dom elements below. after my local test filled the full screen with canvas, the a tag on the page was unclickab...
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How can I tell that the picture drawn in canvas has been loaded?
The scenario goes like this: generate a poster with canvas. Click the button to start drawing the poster, which contains a background image , and a pop-up window that converts the painted canvas into a picture and displays it in the pop-up window. the...
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How does the img tag in html control the size of the saved picture?
the scenario is like this. I need to use canvas to generate an image, which can be achieved by zooming in on the canvas and drawing elements, but this causes the width and height of the generated image to be scaled up proportionally, and the resulting i...
recently, when writing a project, canvas; using h5 has no problem opening it in the editor with a browser, but when it is opened in a folder, the dynamic effect of canvas disappears; check the browser"s: Image from origin "file://" has been blocked from loading by Cross-Origin Resource Sharing policy: Invalid response. Origin "null" is therefore not allowed access. The image from the source file: / / "has been blocked by the cross-source resource sharing policy: invalid response. Therefore, access to "null" is not allowed. Do not understand what is the problem that caused the resource sharing strategy to be blocked? Ask for advice