注解
Click here 下载完整的示例代码
交互功能¶
这提供了交互式功能的使用示例,如Ginput、WaitForButtonPress和Manual Clabel Placement。
此脚本必须使用具有图形用户界面的后端(例如,使用GTK3AGG后端,而不是PS后端)以交互方式运行。
单击三个点定义三角形
plt.clf()
plt.setp(plt.gca(), autoscale_on=False)
tellme('You will define a triangle, click to begin')
plt.waitforbuttonpress()
while True:
pts = []
while len(pts) < 3:
tellme('Select 3 corners with mouse')
pts = np.asarray(plt.ginput(3, timeout=-1))
if len(pts) < 3:
tellme('Too few points, starting over')
time.sleep(1) # Wait a second
ph = plt.fill(pts[:, 0], pts[:, 1], 'r', lw=2)
tellme('Happy? Key click for yes, mouse click for no')
if plt.waitforbuttonpress():
break
# Get rid of fill
for p in ph:
p.remove()
现在根据三角形角的距离来绘制轮廓-举个例子
# Define a nice function of distance from individual pts
def f(x, y, pts):
z = np.zeros_like(x)
for p in pts:
z = z + 1/(np.sqrt((x - p[0])**2 + (y - p[1])**2))
return 1/z
X, Y = np.meshgrid(np.linspace(-1, 1, 51), np.linspace(-1, 1, 51))
Z = f(X, Y, pts)
CS = plt.contour(X, Y, Z, 20)
tellme('Use mouse to select contour label locations, middle button to finish')
CL = plt.clabel(CS, manual=True)
现在做一个变焦
tellme('Now do a nested zoom, click to begin')
plt.waitforbuttonpress()
while True:
tellme('Select two corners of zoom, middle mouse button to finish')
pts = plt.ginput(2, timeout=-1)
if len(pts) < 2:
break
(x0, y0), (x1, y1) = pts
xmin, xmax = sorted([x0, x1])
ymin, ymax = sorted([y0, y1])
plt.xlim(xmin, xmax)
plt.ylim(ymin, ymax)
tellme('All Done!')
plt.show()
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