draw_frame   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/examples/external/openvg.xtm

Implementation

(bind-func draw_frame
  (let ((fill (NVGcolor 1.0 0.0 0.0 0.5))
        (stroke (NVGcolor 0.0 0.0 1.0 0.5))
        (i 0.:f)
        (frame 0))
    (lambda ()
      (nvgBeginFrame vg (convert width) (convert height) pixel_ratio)
      (nvgResetTransform vg)
      (if (not (null? bg_paint))
          ;; draw background image
          (begin
            (nvgFillPaint vg bg_paint)
            (nvgBeginPath vg)
            (nvgRect vg 0. 0. width height)
            (nvgFill vg)))
      ;; loop and draw the circles
      (dotimes (i 200.0)
        (nvgResetTransform vg)
        (nvgTranslate vg
                      (+ (/ width 2.0) (* 200. (cos (* i 0.00025 (convert frame)))))
                      (+ (/ height 2.0) (* 100. (tan (* 0.0001 i (convert frame))))))
        (nvgBeginPath vg)
        (nvgCircle vg 0. 0. 20.)
        (tfill! fill (/ i 200.0) 0.0 (- 1.0 (/ i 200.0)) 0.5)
        (nvgFillColor vg fill)
        (nvgFill vg)
        (nvgStrokeWidth vg 10.)
        (nvgStrokeColor vg stroke)
        (nvgStroke vg))
      (set! frame (+ frame 1))
      (nvgEndFrame vg))))


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