Create polygon by clicking on the map image

Steps:

- Creating an Image of growth.

• The tool create a image of growth from the clicked point, seed point, in the map.
• The growth depends on the threshold used. The RGB value of the seed point is compared with its neighbors,if the difference is smaller then threshold, the image grows.
• The threshold value is show right side of status bar in QGIS window.
• Can change the threshold value directly in the value box or by clicking and dragging the mouse.
  Mouse: moving to the right or up, the treshold increases, otherwise it decreases.
• Using the mouse, clicking and dragging, the image is changed automatically.
  Clicking one time, the image is made with value of threshold.

- Working with Images of Growth.

• Show or hide: Use right botton of mouse.
• Delete the last image: D key.
• Undo: U Key.
• Remove all images: R Key.
• Fill holes: F Key.
• Poligonize: P Key. *** Create polygon from image ***

Menu Setup.

• Metadata: Select the exists field, text type, will be populate with metadata of tool.
• Virtual area(ha): will be added a expression onto polygon layer for calculate area(ha).
• Growth region: Mark this option for calculate with 8 neighborhood pixels(diagonal).
• Adjusts border: Mark this option for adjust border between polygons.

Menu About.

• Show information about this plugin.
• Donation is most welcome!