How can I programmatically ascertain the html color hex codes for colors in a single spectral line? I'm definitely using the wrong terminology I'm just not sure how else to phrase it. This picture should bring clarity:
Notice how the cursor in the top rectangle is always in the same position. It's simply the cursor in the first bar that moves into different color segments, thus generating the hex codes visible below.
Is it possible to generate these programmatically?
it would take 3 steps to get there programatically:
choose the base color (for each of your screen shots its the right top corner)
then lighten it to the the right amount (the X axis of your squares)
then darken it to the right amount (the Y axis of your squares)
if your'e using precompiled css like SASS it would look like that:
$someColor: red;
$lighten: brighten($someColor,20%);
$darkenedColor : darken($lighten, 32%);
$darkenedColor will get you the point that you are looking for, it will work for any given $someColor
Related
In the attached Google charts Pie chart the labels fit well inside the segments. Determining the length of a bit of text in HTML5 canvas is easy enough - but how do you determine whether the label will fit into a particular segment (using trigonometry) ? As you can see on the image, two of the segments don't have labels inside the segment.
EDIT: Here's an example of what I have at the moment: https://www.rgraph.net/tests/canvas.pie/in-pie-labels.html
As you see the labels for the small segments overlap. What I'm after is a way to calculate whether there's enough space for the labels at the point where they're going to be rendered. If not, I can just not draw the label like in the example image above.
Could chord size be useful to do this?
Here's the forumulae for the chord size that I found via Google:
"Chord length using trigonometry = 2 × r × sin(θ/2); where 'r' is the radius of the circle and 'θ' is the angle subtended at the center by the chord."
I sorted it (in about one hour) after 3 days of trying to calculate it with trig by using the built-in context.isPointInPath() function...
Draw the text (transparent color) to get the coordinates (x/y/w/h) of it. You might be able to get away with measuring it to get the width and height.
Draw the segment in a transparent color and do not stroke or fill it. Also, do not close the path.
Test each corner of the text rectangle (formed the x/y/w/h that you got above) using the context.isPointInPath() function. If the function returns true for each corner of the rectangle formed by the coordinates of the text, then the text will fit into the segment.
I am trying to apply an indicator arrow that feeds from a variance Percentage as per screenshot. The only options available within the indicator require me to set a start and end, however. The column that I wish to reference merely shows % change. This can be positive 0.9% for example or negative -2.3%. When working with the percentage change in this way how do you apply a start and end? Ideally, I would like simply to say green up arrow if >0 or red down arrow if less than 0. (right pointing orange arrow if 0 to show no change). Have been google(ing) for a couple of hours now and cannot find a working solution.
The arrows do not work as all currently show Green and up.
This looks like it will solve your issue:
MSDN
It basically doesn't use the values but has an expression for the colour instead.
Looking at Sikuli (in conjunction with Selenium) as a possibility for automating the more visual elements of our UI testing, in particular issues that may crop up when the expected branding is not applied.
In my test, I have a white navigation icon image sat on a purple nav bar. I take a screen grab of the white icon sat on it's purple background and that is used as my Pattern in the Sikuli test class. If I then change the CSS in my web app so the nav bar is red, I want the test to fail.
Unfortunately, the background colour change is ignored and the icon is clicked regardless. If I set the pattern's similarity value to 1f (i.e. an exact match), the icon is not clicked. However, it also does not clicked the icon if I change the nav bar colour to the correct purple so it matches the icon screenshot I am using for the pattern.
A "similar" parameter value of anything from 0 to 0.9 lets the test pass once again, regardless of the nav bar colour.
Is this a restriction in the ability of Sikuli or am I missing something?
Edit:
So I found THIS ANSWER to a similar question and it prompted me to check the score returned when trying to match the white icon on red pattern and the white icon on purple pattern to the web page which had the purple branding. The score for both was over 0.9, with the difference from about the second decimal place onward, hence the match of both when I set the "similar" property of the pattern to 0.9.
It prompted me to try increasing the area of the screen shot to include more background relative to the icon size. This resulted in a score of 0.9x for the white on purple pattern and 0.7x for the white on red pattern.
So my conclusion is that the matching does take account of the background colour but if the majority of the screenshot pattern you are using is the same colour, the difference in score is minute.
Can you bypass the background directly behind the icon and look to the side of it? Excuse my lack of coding knowledge just trying to help come up up with a work-around
exists (icon):
if exists(whitebg): #capture a small area with just the color near the icon
pass
if exists(redbg):
fail
I want to use a variety of location markers in a map, of different colors. I like google's "teardrop"-shaped ones so that the location itself is less obscured, due to the point top of the inverted teardrop.
This is a link to the green one:
http://www.googlemapsmarkers.com/v1/009900/
...and the green uses 0099FF
But what about the other colors? Is there a list somewhere or do I have to write a utility to convert color to RGB, or what?
Even with that, how would I know which colors are supported/supplied? Or are the colors dynamically generated based on the RGB value you pass?
UPDATE
Based on the chart here:
http://cloford.com/resources/colours/500col.htm
...I would expect that entering this:
http://www.googlemapsmarkers.com/v1/65535/
...would return a bright yellow marker, but instead I get:
"400. That’s an error.
Your client has issued a malformed or illegal request.
The parameter 'chs' must have a width of at least 1 pixel.
That’s all we know."
UPDATE 2
I also found that you can put text on the marker by inserting the text in the penultimate spot.
This returns a blank yellow inverted teardrop:
http://www.googlemapsmarkers.com/v1/FFFF00/
..and this:
http://www.googlemapsmarkers.com/v1/Platypus/FFFF00/
...returns an inverted yellow teardrop with the word "Platypus" plastered on top of it.
You can pass your own RGB color. I suppose the markers are dynamically generated when the server receive your request, but anyway, you can create the color you exactly want.
So I know how to shade an image. And I know how to blit a rectangular section of an image. But what about, say, a triangle? Or a trapezoid? (e.g. http://i.imgur.com/Gtwhs.png)
A minute after I asked this, I figured out how to shade, at least. Isn't that always the way?
Anyway, it basically comes down to something as simple as:
surface.blit(image, pos, area)
pygame.draw.polygon(surface, (0,0,0,128), pointlist, 0)
where 128 is whatever alpha value you want and pointlist is a list of the vertices around the section you want.