nvg_draw_text   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/libs/external/nanovg.xtm

Implementation

(bind-func nvg_draw_text
  (lambda (vg text:String* bounds:Rect* face:String* font_size)
    ;; find bounds
    (let ((h (tref bounds 3))
          (textbox_height font_size)
          (b_ptr:float* (salloc 4)))
      (nvgTextAlign vg (bor NVG_ALIGN_BOTTOM NVG_ALIGN_CENTER))
      (nvgFontFace vg (cstring face))
      (nvgFontSize vg font_size)
      (nvgTextBoxBounds vg
                        (tref bounds 0)
                        (tref bounds 1)
                        (tref bounds 2)
                        (cstring text) null
                        b_ptr)
      (set! textbox_height (- (pref b_ptr 3) (pref b_ptr 1)))
      ;; draw text
      (nvgTextBox vg
                  (tref bounds 0)
                  (+ (tref bounds 1) (/ (+ (tref bounds 3) textbox_height) 2.0))
                  (tref bounds 2)
                  (cstring text) null))))


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