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Clamp image position to avoid showing empty areas #4

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Clamp image position to avoid showing empty areas #4

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7 changes: 7 additions & 0 deletions src/reference_viewer.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -104,6 +104,13 @@ ReferenceViewer.createViewer = function(title)
-- Updates the value of the slider with the actual value of scale_factor.
dlg:modify{id="scale_slider", value=scale_factor*100}

-- Clamp image position to avoid showing empty areas.
local min_display_pixels = 2 * inv_scale_factor
image_pos.x = math.max(image_pos.x, -gc.width * inv_scale_factor + min_display_pixels)
image_pos.x = math.min(image_pos.x, active_image.width - min_display_pixels)
image_pos.y = math.max(image_pos.y, -gc.height * inv_scale_factor + min_display_pixels)
image_pos.y = math.min(image_pos.y, active_image.height - min_display_pixels)

local image
-- When we zoom-in (scale_factor > fit_scale) we only
-- see a part of the image. We only copy what is visible
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