update_window_poseT_update_window_poseUpdateWindowPoseUpdateWindowPose (Operator)

Name

update_window_poseT_update_window_poseUpdateWindowPoseUpdateWindowPose — Modify the pose of a 3D plot.

Signature

update_window_pose( : : WindowHandle, LastRow, LastCol, CurrentRow, CurrentCol, Mode : )

The operator update_window_poseupdate_window_poseUpdateWindowPoseUpdateWindowPoseUpdateWindowPose provides an easy way to modify the pose of the height field displayed by disp_objdisp_objDispObjDispObjDispObj if the paint mode is set to '3d_plot'"3d_plot""3d_plot""3d_plot""3d_plot" using set_paintset_paintSetPaintSetPaintSetPaint.

Two window coordinates (LastRowLastRowLastRowLastRowlastRow,LastColLastColLastColLastCollastCol) and (CurrentRowCurrentRowCurrentRowCurrentRowcurrentRow, CurrentColCurrentColCurrentColCurrentColcurrentCol) are transformed into rotation, scaling, or movement depending on ModeModeModeModemode. This window coordinates must be provided with respect to the current image part. As a consequence, this coordinates are subpixel coordinates. Given the current image part (row1,column1,row2,column2), the upper left corner corresponds to the coordinate (row1 - 0.5, col1 - 0.5). Accordingly, the bottom right corner corresponds to the coordinate (row2 - 0.5, col2 - 0.5). Use get_mposition_sub_pixget_mposition_sub_pixGetMpositionSubPixGetMpositionSubPixGetMpositionSubPix or get_mbutton_sub_pixget_mbutton_sub_pixGetMbuttonSubPixGetMbuttonSubPixGetMbuttonSubPix to obtain this coordinates directly.

If ModeModeModeModemode is set to 'rotate'"rotate""rotate""rotate""rotate", the height field is rotated using a virtual trackball model. Both points are projected on a sphere centered in the center of the window WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle. The circular arc between this two projections corresponds to the rotation applied to the height field.

If ModeModeModeModemode is set to 'scale'"scale""scale""scale""scale", zooming is reduced if CurrentRowCurrentRowCurrentRowCurrentRowcurrentRow is greater than LastRowLastRowLastRowLastRowlastRow and increased if CurrentRowCurrentRowCurrentRowCurrentRowcurrentRow is smaller than LastRowLastRowLastRowLastRowlastRow.

If ModeModeModeModemode is set to 'move'"move""move""move""move", the input points are projected onto the plane through the center of the height field parallel to the viewing plane. The center of the height field is moved in this plane by the distance between both projections.

If ModeModeModeModemode is set to 'move_plane'"move_plane""move_plane""move_plane""move_plane", the input points are projected on the plane given by height zero. The height field is moved in this plane by the distance between both projections.

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

Parameters

WindowHandleWindowHandleWindowHandleWindowHandlewindowHandle (input_control) window → (handle)

Window handle.

LastRowLastRowLastRowLastRowlastRow (input_control) point.y → (real / integer)

Row coordinate of the first point.

LastColLastColLastColLastCollastCol (input_control) point.x → (real / integer)

Column coordinate of the first point.

CurrentRowCurrentRowCurrentRowCurrentRowcurrentRow (input_control) point.y → (real / integer)

Row coordinate of the second point.

CurrentColCurrentColCurrentColCurrentColcurrentCol (input_control) point.x → (real / integer)

Column coordinate of the second point.

ModeModeModeModemode (input_control) string → (string)

Navigation mode.

Default value: 'rotate' "rotate" "rotate" "rotate" "rotate"

List of values: 'move'"move""move""move""move", 'move_plane'"move_plane""move_plane""move_plane""move_plane", 'rotate'"rotate""rotate""rotate""rotate", 'scale'"scale""scale""scale""scale"

Example (HDevelop)

* Interactive display of a height field
dev_set_paint ('3d_plot')
while (1)
  dev_set_check ('~give_error')
  get_mposition_sub_pix (WindowHandle, Row, Column, Button)
  dev_set_check ('give_error')
  if (ButtonDown and (Button == 0))
    ButtonDown := false
  endif
  if (not(Button == 0))
    if (ButtonDown)
      if (Button == 1)
        mode := 'rotate'
      endif
      if (Button == 4)
        mode := 'scale'
      endif
      if (Button == 5)
        mode := 'move'
      endif
      update_window_pose (WindowHandle, lastRow, lastCol, Row, Column, mode)
    else
      if (Button == 2)
        break
      endif
      ButtonDown := true
    endif
    lastCol := Column
    lastRow := Row
  endif
  dev_display (Image)
endwhile