38 lines
1.5 KiB
Text
38 lines
1.5 KiB
Text
# zoom.ludic - zoom: 0.8 (or 80%, or calc(), min() and the rest: min(1, calc(100vw / 1800px))) makes
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# an element and everything inside it that much larger or smaller, its lengths, its text and its
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# layout; zooms multiply down the tree. A length in px is zoomed as it is read (el_px).
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function el_zoom(ui_st: mut UiState, n: UiNode, s0: string) -> void {
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let s = tpl_words(s0)
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var z = 1.0
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if ca_is(s) {
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if ca_eval(ui_st, s) {
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z = ui_st.ca_num
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@alloc_ok("only when a template is wrong: a broken screen, never a working one")
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if not ui_st.ca_bare { ui_err(ui_st, `zoom: {s} - a zoom is a plain number (divide a length by a length)`) }
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}
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} else if len(s) > 1 and s[len(s) - 1] == 37 { z = el_num(s) / 100.0 } else if s != "normal" { z = el_num(s) }
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if z <= 0.0 { z = 1.0 }
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nx(n).zoom = z
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}
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function zm_own(n: UiNode) -> float {
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if n.ex == null { return 1.0 }
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return n.ex.zoom
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}
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# every zoom from this element out
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function zm_all(n: UiNode) -> float {
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var z = 1.0
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var at = n
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while at != null {
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z = z * zm_own(at)
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at = at.parent
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}
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return z
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}
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# a length of `v` design pixels on the element being styled: the renderer's scale and every zoom
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# around it (its own too, except while its zoom itself is read)
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function el_px(ui_st: UiState, v: float) -> float {
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if ui_st.el_cur == null { return ui_px(ui_st, v) }
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if ui_st.el_key == "zoom" and ui_st.el_cur.parent != null { return ui_px(ui_st, v) * zm_all(ui_st.el_cur.parent) }
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if ui_st.el_key == "zoom" { return ui_px(ui_st, v) }
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return ui_px(ui_st, v) * zm_all(ui_st.el_cur)
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}
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