PHP Gmagick flopimage () Function

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Gmagick Gmagick::flopimage (void)
Parameters:this function takes no parameters.Return Value:This function returns a failed Gmagick object.Errors / Exceptions:this the function throws a GmagickException on error.The following programs illustrate the Gmagick::flopimage() functionin PHP:Program 1:
Original image: < tbody>
// Create a Gmagick object $gmagick = new Gmagick ( -content / uploads / tech.png );
// Using the flopimage() function $gmagick -> flopimage(); header ( ’ Content-type: image / png’ );
// Display image echo $gmagick ; ?>
Output: Program 2: < tbody>
// Create a GmagickDraw object $draw = new GmagickDraw();
// Create GmagickPixel $strokeColor = new GmagickPixel ( ’Red’ ); $fillColor = new GmagickPixel ( ’Green’ );
// Set the color, opacity of the image $draw -> setStrokeOpacity (1); $draw -> setStrokeColor ( ’Red’ ); $draw -> setFillColor ( ’Green’ );
// Set the width and height of the image $draw -> setStrokeWidth (7); $draw -> setFontSize (72);
// Function for drawing a circle $draw -> circle (250, 250, 100, 150); $gmagick = new Gmagick(); $gmagick -> newImage (500, 500, ’White’ ); $gmagick -> annotateimage ( $draw , 50, 60, 54, ’GeeksForGeeks’ ); $gmagick -> setImageFormat ( "png" ); $gmagick -> drawImage ( $draw );
// Using the flopimage() function $gmagick -> flopimage();
// Display the output image header ( "Content-Type: image / png" ); echo $gmagick -> getImageBlob(); ?>
Output: Link :

PHP Gmagick flopimage () Function circle: Questions

How to do a scatter plot with empty circles in Python?

2 answers

In Python, with Matplotlib, how can a scatter plot with empty circles be plotted? The goal is to draw empty circles around some of the colored disks already plotted by scatter(), so as to highlight them, ideally without having to redraw the colored circles.

I tried facecolors=None, to no avail.


Answer #1

From the documentation for scatter:

Optional kwargs control the Collection properties; in particular:

        The string ‘none’ to plot faces with no outlines
        The string ‘none’ to plot unfilled outlines

Try the following:

import matplotlib.pyplot as plt 
import numpy as np 

x = np.random.randn(60) 
y = np.random.randn(60)

plt.scatter(x, y, s=80, facecolors="none", edgecolors="r")

example image

Note: For other types of plots see this post on the use of markeredgecolor and markerfacecolor.

plot a circle with pyplot

2 answers

surprisingly I didn"t find a straight-forward description on how to draw a circle with matplotlib.pyplot (please no pylab) taking as input center (x,y) and radius r. I tried some variants of this:

import matplotlib.pyplot as plt
# here must be something like circle.plot() or not?

... but still didn"t get it working.


Answer #1

You need to add it to an axes. A Circle is a subclass of an Patch, and an axes has an add_patch method. (You can also use add_artist but it"s not recommended.)

Here"s an example of doing this:

import matplotlib.pyplot as plt

circle1 = plt.Circle((0, 0), 0.2, color="r")
circle2 = plt.Circle((0.5, 0.5), 0.2, color="blue")
circle3 = plt.Circle((1, 1), 0.2, color="g", clip_on=False)

fig, ax = plt.subplots() # note we must use plt.subplots, not plt.subplot
# (or if you have an existing figure)
# fig = plt.gcf()
# ax = fig.gca()



This results in the following figure:

The first circle is at the origin, but by default clip_on is True, so the circle is clipped when ever it extends beyond the axes. The third (green) circle shows what happens when you don"t clip the Artist. It extends beyond the axes (but not beyond the figure, ie the figure size is not automatically adjusted to plot all of your artists).

The units for x, y and radius correspond to data units by default. In this case, I didn"t plot anything on my axes (fig.gca() returns the current axes), and since the limits have never been set, they defaults to an x and y range from 0 to 1.

Here"s a continuation of the example, showing how units matter:

circle1 = plt.Circle((0, 0), 2, color="r")
# now make a circle with no fill, which is good for hi-lighting key results
circle2 = plt.Circle((5, 5), 0.5, color="b", fill=False)
circle3 = plt.Circle((10, 10), 2, color="g", clip_on=False)
ax = plt.gca()
ax.cla() # clear things for fresh plot

# change default range so that new circles will work
ax.set_xlim((0, 10))
ax.set_ylim((0, 10))
# some data
ax.plot(range(11), "o", color="black")
# key data point that we are encircling
ax.plot((5), (5), "o", color="y")

which results in:

You can see how I set the fill of the 2nd circle to False, which is useful for encircling key results (like my yellow data point).

PHP Gmagick flopimage () Function PHP: Questions


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