How to find the coordinates of a line in HTML5 Canvas

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Hi,

I am developing a Building Plan Drawing Application in HTML5.
For that I needed to place the doors and windows on walls.
Usually, the walls (lines) are not straight.
How can I find if my mouse has touched the walls (lines) while moving the door Image.
Moreover, I should find the X, Y and angle of the door to be drawn.
Please help...

Posted 12-May-14 3:15am

Yesudasan Moses

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-05-12T16:55:00

This is called "hit testing".

This is a working JSFiddle sample of the solution: http://jsfiddle.net/G7nDS/6[^].

See also:
http://stackoverflow.com/questions/19807049/html5-canvas-hittest-arbitrary-shape[^],
http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#hit-regions[^],
http://www.w3.org/wiki/Canvas_hit_testing[^].

You can find some more demonstrations is you do something like this: http://bit.ly/RBjT0i[^].

—SA