25 lines
989 B
Plaintext
25 lines
989 B
Plaintext
schema1_of_y = function(editor, y)
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-- return line/pos of screen line starting near a given y offset,
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-- and the (negative) offset remaining after the calculation
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-- invariants:
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-- - 0 >= y_offset >= -Line_height
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-- - let loc, y_offset = schema1_of_y(pane, y)
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-- y + y_offset == y_of_schema1(pane, loc)
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assert(y >= 0)
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local y_offset = y
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for i=1,#editor.lines do
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Text.populate_screen_line_starting_pos(editor, i)
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local height = line_height(editor, i)
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if y_offset < height then
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local line = editor.lines[i]
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local nlines = math.floor(y_offset/editor.line_height)
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assert(nlines >= 0 and nlines < #editor.line_cache[i].screen_line_starting_pos)
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local pos = editor.line_cache[i].screen_line_starting_pos[nlines+1] -- switch to 1-indexing
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y_offset = y_offset - nlines*editor.line_height
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return {line=i, pos=pos}, -y_offset
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end
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y_offset = y_offset - height
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end
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-- y is below the pane
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return {line=#editor.lines+1, pos=1}, y_offset -- positive value
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end |