H5 canvas implements circular dynamic loading progress example
When I was browsing Q&A recently, I encountered someone asking how to create a dynamic circular progress function. The specific effect is as follows:
I have two ideas, but using canvas is undoubtedly the most convenient solution. Here we take the canvas implementation as an example to implement it specifically. The steps are as follows:
1. Create a canvas container displayed on the front desk, the code is as follows:
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2. Get the canvas Container, create a painting object, the code is as follows:
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3. Draw the initial gray circle, the circle is actually formed by the superposition of two concentric circles, the code As follows:
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4. Add the progress percentage, the code is as follows:
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5. Modify the drawing space size according to the progress value, the code is as follows:
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6. Draw the progress ring and progress percentage in the new drawing space. The code is almost the same as before. , just modify the fill color, the code is as follows:
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The static circular progress effect has been completed. The next step is to use the timer to modify the current progress value and draw it repeatedly. That's it, but it should be noted that after adding the outer ring and progress percentage, you need to use
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to save the current session space, and then use after all the painting is completed.
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To restore the original drawing space, because the modified drawing space is obtained by cutting it under the current drawing space, so every time all drawings are completed, they need to be restored to the initial drawing space, as follows Is the complete js code:
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Share Example code of h5 canvas circle progress bar
2.html5 canvas implementation of circular clock example code
3.The above is the detailed content of H5 canvas implements circular dynamic loading progress example. For more information, please follow other related articles on the PHP Chinese website!

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