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draw Bézier curves and connecting lines
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parent
2bd6847e78
commit
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@ -66,9 +66,11 @@ renderStroke cols zoom ( Stroke strokePts ) = go True strokePts
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drawPoints, drawNextPoints, drawPath, drawNextPath :: Cairo.Render ()
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( drawNextPoints, drawNextPath ) = go False ( p2 : ps )
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drawPoints = do
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when drawFirstPoint ( drawPoint cols zoom p0 )
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drawControl cols zoom p1
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drawPoint cols zoom p2
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drawLine cols zoom p0 p1
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drawLine cols zoom p1 p2
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when drawFirstPoint ( drawPoint cols zoom p0 )
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drawPoint cols zoom p2
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drawNextPoints
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drawPath = do
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drawQuadraticBezier cols zoom ( Quadratic.Bezier p0 p1 p2 )
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@ -85,7 +87,7 @@ drawPoint ( Colours { pathPoint, pathPointOutline } ) zoom ( Point2D x y ) = do
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Cairo.save
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Cairo.translate x y
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Cairo.scale ( 4 / zoom ) ( 4 / zoom )
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Cairo.scale ( 3 / zoom ) ( 3 / zoom )
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Cairo.moveTo 1 0
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Cairo.lineTo 0.5 hsqrt3
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@ -95,7 +97,7 @@ drawPoint ( Colours { pathPoint, pathPointOutline } ) zoom ( Point2D x y ) = do
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Cairo.lineTo 0.5 (-hsqrt3)
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Cairo.closePath
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Cairo.setLineWidth 1
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Cairo.setLineWidth 0.8
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withRGBA pathPointOutline Cairo.setSourceRGBA
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Cairo.strokePreserve
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@ -108,11 +110,11 @@ drawControl ( Colours { controlPoint, controlPointOutline } ) zoom ( Point2D x y
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Cairo.save
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Cairo.translate x y
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Cairo.scale ( 4 / zoom ) ( 4 / zoom )
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Cairo.scale ( 3 / zoom ) ( 3 / zoom )
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Cairo.arc 0 0 1 0 ( 2 * pi )
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Cairo.setLineWidth 1
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Cairo.setLineWidth 0.8
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withRGBA controlPointOutline Cairo.setSourceRGBA
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Cairo.strokePreserve
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@ -121,5 +123,39 @@ drawControl ( Colours { controlPoint, controlPointOutline } ) zoom ( Point2D x y
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Cairo.restore
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drawLine :: Colours -> Double -> Point2D Double -> Point2D Double -> Cairo.Render ()
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drawLine ( Colours { controlPoint } ) zoom ( Point2D x1 y1 ) ( Point2D x2 y2 ) = do
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Cairo.save
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Cairo.moveTo x1 y1
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Cairo.lineTo x2 y2
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Cairo.setLineWidth ( 3 / zoom )
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withRGBA controlPoint Cairo.setSourceRGBA
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Cairo.stroke
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Cairo.restore
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drawQuadraticBezier :: Colours -> Double -> Quadratic.Bezier ( Point2D Double ) -> Cairo.Render ()
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drawQuadraticBezier _ _ _ = pure ()
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drawQuadraticBezier ( Colours { path } ) zoom
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( Quadratic.Bezier
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{ p0 = Point2D x0 y0
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, p1 = Point2D x1 y1
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, p2 = Point2D x2 y2
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}
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)
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= do
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Cairo.save
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Cairo.moveTo x0 y0
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Cairo.curveTo
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( ( 2 * x1 + x0 ) / 3 ) ( ( 2 * y1 + y0 ) / 3 )
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( ( 2 * x1 + x2 ) / 3 ) ( ( 2 * y1 + y2 ) / 3 )
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x2 y2
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Cairo.setLineWidth ( 6 / zoom )
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withRGBA path Cairo.setSourceRGBA
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Cairo.stroke
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Cairo.restore
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@ -114,6 +114,7 @@ createViewport colours activeDocumentTVar openDocumentsTVar viewportGrid = do
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GTK.setContainerChild viewportOverlay viewportDrawingArea
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GTK.widgetAddEvents viewportDrawingArea
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[ GDK.EventMaskPointerMotionMask
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, GDK.EventMaskButtonPressMask, GDK.EventMaskButtonReleaseMask
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, GDK.EventMaskScrollMask, GDK.EventMaskSmoothScrollMask
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]
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