Translating MOUSE coordinates

Programming Questions

curoiusbr..

Translating MOUSE coordinates

in Programming Questions • 7 months ago

Hi,

I have created a button in my application by defining certain region of action of mouse.

if(mousePressed && 30 < mouseX && mouseX < 200 && 100 < mouseY && mouseY < 200 ) {

fill(100,30,123);

rect(30,100,270,100);

}

and after that I applied a translation

translation(0,0);

if(mousePressed && 30 < mouseX && mouseX < 200 && 100 < mouseY && mouseY < 200 ) {

fill(100,30,123);

rect(30,100,270,100);

}

but here the rectangle gets translate but the mouse still works on that certain region only it doesn't shift. Can you tell me how to translate everything ( rectangle + mouse)

Replies(4)

amnon.owed

Re: Translating MOUSE coordinates

7 months ago

You can't translate the mouse as such, but you can change the mouse coordinates you use in your method.

Code Snippet

translate(300, 0); // x plus 300
int mx = mouseX-300; // 'translated' mouse coordinate is mouseX minus 300
if (30 < mx) // use mx instead of mouseX in your method
// etc.
}

curoiusbr..

Re: Translating MOUSE coordinates

7 months ago

@amnon.owed thanks! It is very simple just by subtraction ( 'translated' mouse coordinate is mouseX minus 300) method which is a common sense but I was expecting something else. I was curious about, if mouse translation is support in processing like the translation method for graphics or not if it does, what are the way to do it?

amnon.owed

Re: Translating MOUSE coordinates

7 months ago

Perhaps I am missing your point but in my opinion the 'mouse translation' you talk about doesn't make any sense when you think about what mouseX and mouseY actually are: the x and y location of the mouse within the 2D sketch window. However translate, rotate, scale are 2D/3D operations that work on the transformation matrix hence they affect the position, rotation and scale of displayed shapes. When you do these operations, the shape will no longer be under the mouse. The easiest to solve is 2D translate as shown above. All other will usually mean more involved calculations or other mouseover methods (like color buffer picking).

curoiusbr..

Re: Translating MOUSE coordinates

7 months ago

@amnon.owed thanks :) again ..now you answered my question :) :) :)

Like you said it doesn't make any sense to translate mouseX and mouseY location but I think It does, suppose you have made some application with 1200,800 window size with some interactive buttons and now you take your application to another computer which has, let say 800,600 screen size but your application window size is bigger than the your computer screen. Here your application will work fine but the problem is your all graphics will be clipped by the screen and will hide some graphics elements like interactive buttons under the screen. Suppose if application has function to resize its window size according to computer screen then there will be no problem but another problem will arise like I mention in the question mouse coordinate will not get shift and create problem while interacting with the buttons.

Now please tell me how will you solve this problem?

Can I ask you one more question it different from above question? I want to drag my application window using

frame.setLocation() method and in this I am passing my mouse location mouseX & mouseY parameters through the function

frame.setLocation(mouseX,mouseY);

Here, when I tried this method I found that it is not smooth I mean whenever I try to click drag the window, window starts shaking.

Can you help me making this dragging smooth ?

(PS: Because of you guys only this forum is running and questions are getting answered :) thanks you :) I am really glad to get replies so soon :) )

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