Intersect Function
Is there a function to determine the intersection point (x,y) of two lines? The intersect function in LC only gives me a true or false, and I need the exact location (x,y) of the intersection. Thanks, Beat ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Intersect Function
Thanks Craig, I was already afraid of that. Yes, I guess I could figure out the math. I will have the 2 functions of the lines and if I set them equal, I could solve the intersection point of the two. Your way is also valid, but as I need to determine many intersection points, the script might get slow. Of course your way might prove better if we're looking at curves. The amount of points in a curved line increases some in comparison to a straight line, but in setting the functions equal, I'd have to deal with quadratic functions. It just comes to me, that that is quite doable : move everything to one side of the equal sign and apply the famous 'abc formula' (at least that it was called in my high school years in Holland). It's used to solve a quadratic equation. Once the 'x' is known, I can put it into one of the functions to get the 'y' coordinate. I will see what goes faster. Cheers, Beat On Mon, Sep 24, 2018 at 3:15 PM dunbarxx via use-livecode < use-livecode@lists.runrev.com> wrote: > Hi. > > No. > > But you can determine the points of a line graphic, and calculate all the > pixels it "contains" from its starting point to its ending point. Do the > same for a second line. > > Then you can determine the point that seems to be common to both lines. I > say seems, because when you do the math, that is, using the slope of each > line and calculating the points using that information, you may find that > there are no exact matches. But you can allow a small differential, and the > closest pair of points will be the one you want. > > Can you do the math? > > Craig Newman > > > > -- > Sent from: > http://runtime-revolution.278305.n4.nabble.com/Revolution-User-f278306.html > > ___ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Get RGB color of a specific screen location
How do I get the RGB color of a pixel of an image? I know the function the MouseColor, which gives me the RGB numbers under the cursor. What I need is to get the RGB of a specific screen location - I need to make an avarage of e.g. 5x5 pixels. So how do I get the RGB numbers of e.g. location "30,200"? Cheers, Beat ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Get RGB color of a specific screen location
I have asked this befor, but for the first time did not get any answer on my post. So I hope you don't mind that I try again :-) How do I get the RGB color of a pixel of an image? I know the function the MouseColor, which gives me the RGB numbers under the cursor. What I need is to get the RGB of a specific screen location - I need to make an avarage of e.g. 5x5 pixels. So how do I get the RGB numbers of e.g. location "30,200"? Cheers, Beat ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Get RGB color of a specific screen location
Thanks everyone for the many suggestions. I will try them out and see which one will work best. Appreciate the multitude of ideas. Cheers, Beat ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: Get RGB color of a specific screen location
I have used the export snapshot and then the averaging. Works great. I had forgotten about the export function (have been away from coding for 3 years). I also had to implement Phil Davis' "set the screenMouseLoc to globalLoc(tLocWithinMyStack)". The average I got first (with only the mouseLoc) was offsetted to where I clicked. Now it purs :-) Thanks again, Beat ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
scrCopy BlendMode
A couple of questions about BlendModes in LC. 1. The 'normal' blendMode is scrCopy (the mode all objects get when they are created). I can change that blendmode and later put it back to scrCopy in the Inspector. But setting the ink to scrCopy by script does not work. I type in the messagebox : *set the ink of img "DSC03103.jpeg" to scrCopy* I get the following error : *Message execution error:* *Error description: Property: invalid enumeration value* *Hint: * Can anyone tell me how to set the blendMode of an image to scrCopy by script? 2. What happened to the blendModes that do not work either, like : BlendScr, BlendScrOver, NotSreenAnd and 15 others? Why are they available in the choices, but do not seem to work (execution error). 3. Where can I find detailed info about the different blend modes. I'm looking for the math on what they all do. Kind regards, Beat ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
Re: scrCopy BlendMode
>>1. If you quote the modes then it works. hh wrote : > set the ink of img "DSC03103.jpeg" to "srcCopy" Thanks, that works. As for info about blendmodes, hh wrote : > https://en.wikipedia.org/wiki/Blend_modes I had seen this site, but was wondering about the other blend modes in LC. Including the old (Legecy ones). Where do I find a mathematical description of how these specific LC modes work? Thanks, Beat ___ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
