Slider的标题不可见 (VPython)

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英文:

Captions of slider not visible (VPython)

问题

Here is the translated portion of your code:

  1. # Import libraries
  2. import vpython as vp
  4. # Create Canvas
  6. # Create objects
  8. # Define the planet
  10. # Define the atmosphere
  12. # Define the light source
  14. # Define the camera
  16. # Define the event handlers
  18. # Create the slider to rotate the light source around
  20. # Create the slider
  22. # Create slider to change light source wavelength
  24. # Define the white light button
  26. # Create the exit button
  28. # Run the simulation

If you need any specific part of the code translated, please let me know.

英文:

I have create a little 3d simulation with VPython. And with it sliders to control positions and colors or objects. However, I can't find a way to display a caption to indicate what is the slider about.

I have added an argument when defining the slider wtitle. I don't get any error message so I assume it is rightfuly defined but the caption is probably hidden or I am missing a step somewhere.

Here is my code:

  1. """ Import libraries """
  3. import vpython as vp
  4.     
  5. """ Create Canvas """
  7. canvas = vp.canvas(width=1080, height=720)
  8. scene = vp.scene
  10. """ Create objects """
  12. # Define the planet
  13. planet_radius = 5
  14. # planet_texture = 'planet.jpg'  # You can replace this with your own custom picture
  15. planet = vp.sphere(radius=planet_radius, texture=vp.textures.earth, shininess=0)
  17. def atm_opacity(wavelength):
  18.     return atm_density * (550 / wavelength)**4
  20. # Define the atmosphere
  21. atm_thickness = 3.0  # You can modify this using a slide cursor
  22. atm_density = 0.5  # You can modify this using a slide cursor
  23. atm_radius = planet.radius+atm_thickness
  24. atm = vp.sphere(radius=atm_radius, opacity=0.25)
  25. atm.opacity_function = atm_opacity
  27. # Define the light source
  29. def light_color(wavelength):
  30.     r, g, b = 0, 0, 0
  31.     if wavelength >= 400 and wavelength < 440:
  32.         r = -(wavelength - 440) / (440 - 400)
  33.         b = 1.0
  34.     elif wavelength >= 440 and wavelength < 490:
  35.         g = (wavelength - 440) / (490 - 440)
  36.         b = 1.0
  37.     elif wavelength >= 490 and wavelength < 510:
  38.         g = 1.0
  39.         b = -(wavelength - 510) / (510 - 490)
  40.     elif wavelength >= 510 and wavelength < 580:
  41.         r = (wavelength - 510) / (580 - 510)
  42.         g = 1.0
  43.     elif wavelength >= 580 and wavelength < 645:
  44.         r = 1.0
  45.         g = -(wavelength - 645) / (645 - 580)
  46.     elif wavelength >= 645 and wavelength <= 700:
  47.         r = 1.0
  48.     return vp.vector(r, g, b)
  50. light_type = 'red'  # You can modify this using a drop-down menu
  51. # light_wavelength = 550  # You can modify this using a slide cursor
  52. light_size = 2  # You can modify this using a slide cursor
  53. light_intensity = 1.0  # You can modify this using a slide cursor
  54. pos_drift = 50
  55. light_xpos = atm_radius+pos_drift
  56. light_ypos = atm_radius+pos_drift
  57. light_zpos = atm_radius+pos_drift
  58. light_pos = vp.vector(light_xpos, light_ypos, light_zpos)
  59. wavelength = 400
  60. light = vp.local_light(pos=light_pos, color= light_color(wavelength), radius=light_size)
  61. light.color_function = light_color
  64. # Define the camera
  65. scene.autoscale = False
  66. scene.range = 10
  67. scene.forward = vp.vector(0, 0, -1)
  68. scene.up = vp.vector(0, 1, 0)
  69. scene.caption = 'Click and drag on the light source to move it. Use the drop-down menu and slide cursors to adjust its properties.'
  71. """ Define the event handlers """
  73. def on_light_down(evt):
  74.     global light_dragging, light_drag_pos
  75.     light_dragging = True
  76.     light_drag_pos = evt.pos
  78. def on_light_move(evt):
  79.     global light_dragging, light_drag_pos
  80.     if light_dragging:
  81.         light.pos += evt.pos - light_drag_pos
  82.         light_drag_pos = evt.pos
  84. def on_light_up(evt):
  85.     global light_dragging
  86.     light_dragging = False
  88. # Bind the event handlers
  89. vp.scene.bind('mousedown', on_light_down)
  90. vp.scene.bind('mousemove', on_light_move)
  91. vp.scene.bind('mouseup', on_light_up)
  93. def on_mouse_down(event):
  94.     global dragging, last_mouse_pos
  95.     obj = scene.mouse.pick
  96.     if obj == light:
  97.         dragging = True
  98.         last_mouse_pos = scene.mouse.pos
  100. canvas.bind('mousedown', on_mouse_down)
  102. # Create the slider to rotate the light source around
  103. def set_rotation_angle(slider):
  104.     # light.rotate(angle=slider.value, axis=vp.vector(0, 1, 0), origin=planet.pos)
  105.     
  106.     # Calculate the rotation angle
  107.     angle = vp.radians(slider.value)
  108.     
  109.     # Calculate the new position of the object
  110.     x = atm_radius+pos_drift * vp.cos(angle)
  111.     y = 0
  112.     z = atm_radius+pos_drift * vp.sin(angle)
  113.     
  114.     # Set the position of the object
  115.     light.pos = vp.vector(x, y, z)
  117. # Create the slider
  118. slider = vp.slider(wtitle='Rotate light source', min=0, max=360, step=1, value=0, bind=set_rotation_angle)
  120. # Create slider to change light source wavelength
  121. def WL_cursor(slider):
  122.     val = slider.value
  123.     new_wavelength = light_color(val)
  124.     global light
  125.     light.color = new_wavelength
  126.     
  127. slider = vp.slider(wtitle='Change light source color', min=400, max=700, length=250, bind=WL_cursor)
  129. # Define the white light button
  130. def white():
  131.     global light
  132.     light.color = vp.color.white
  134. # Create the exit button
  135. white_button = vp.button(bind=white, text="White light")
  137. """ Run the simulation """
  139. while True:
  140.     vp.rate(30)
  141.     
  142.     # Update the atmosphere
  143.     atm.radius = planet.radius+atm_thickness
  144.     atm.opacity = 0.25*atm_density
  145.     
  146.     # Update the light source
  147.     light.radius = light_size
  148.     light.intensity = light_intensity
  149.     light.pos = light.pos
  151.     # Update the camera
  152.     vp.scene.center = planet.pos

答案1

得分: 2

你需要将滑块添加到canvas而不是scene，原因不明。所以可以这样操作：

  1. slider_angle = vp.slider(wtitle='旋转光源角度', min=0, max=360, step=1, value=0, bind=set_rotation_angle, right=15)
  2. canvas.append_to_caption('滑动光标以移动光源。')
  3. canvas.append_to_caption('\n\n')
英文:

Instead of adding the sliders to the scene you need to add it to the canvas for some reason. So something like:

  1. slider_angle = vp.slider(wtitle='Rotate light source', min=0, max=360, step=1, value=0, bind=set_rotation_angle, right=15)
  2. canvas.append_to_caption('Slide the cursor to move the light source.')
  3. canvas.append_to_caption('\n\n')

答案2

得分: 1

VPython会自动创建一个名为"scene"的画布（或在您的情况下是"vp.scene"）。然后，您会说scene = vp.scene，并设置此画布的各种属性，比如scene.autoscale = False。但您还创建了第二个名为canvas的画布：canvas = vp.canvas(...)。大部分程序引用名为scene的画布，但您将"mousedown"绑定到了canvas，这会令人困惑。最清晰的做法是删除对"canvas"的创建，并将mousedown绑定到scene。

英文:

VPython automatically creates a canvas named "scene" (or in your case "vp.scene"). You then say scene = vp.scene and you set various attributes of this canvas, such as scene.autoscale = False. But you also create a second canvas, named canvas: canvas = vp.canvas(...). The most of your program references the canvas named scene, but you bind "mousedown" to canvas, which is confusing. The cleanest way to proceed is to delete the creation of "canvas" and bind mousedown to scene.

huangapple
  • 本文由 发表于 2023年4月13日 23:04:03
  • 转载请务必保留本文链接：https://go.coder-hub.com/76007000.html
  • 3d
  • python
  • slider
  • vpython
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