Well sir, first try to code anything and then come to ask for assistance with particular problem. For now it looks like you have no clue about subject and not even tried. I can anwser a question like how to manipulate opacity in canvas, how to implement drag and drop, etc...
but NOT I need someone to implement my whole idea for me
I should also point out that Canvas isn't probably the best technology for this task (in the meaning of both performance and implementation difficulty).
If you insist, you will have to rewrite all functionality which is already easily accessible with DOM and libraries like jQuery.
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好吧，先生，首先尝试编写任何代码，然后针对特定问题寻求帮助。目前看来您对主题一无所知，甚至没有尝试过。我可以回答诸如
如何操纵画布中的不透明度、如何实现拖放、等...之类的问题，但不能回答
我需要有人为我实现我的整个想法我还应该指出，Canvas 可能不是完成这项任务的最佳技术（就性能和实现难度而言）。
如果你坚持，你将不得不重写所有已经可以通过 DOM 和 jQuery 等库轻松访问的功能。
Well sir, first try to code anything and then come to ask for assistance with particular problem. For now it looks like you have no clue about subject and not even tried. I can anwser a question like
how to manipulate opacity in canvas,how to implement drag and drop,etc...but NOT
I need someone to implement my whole idea for meI should also point out that Canvas isn't probably the best technology for this task (in the meaning of both performance and implementation difficulty).
If you insist, you will have to rewrite all functionality which is already easily accessible with DOM and libraries like jQuery.