add IMDraw drawing methods
This commit is contained in:
faiface
parent
2e8f5fb05a
commit
3aa5478499
426
graphics.go
426
graphics.go
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@ -67,7 +67,7 @@ func (s *Sprite) Draw(t Target) {
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// IMDraw is an immediate-like-mode shape drawer.
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//
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// TODO: mode doc
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// TODO: doc
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type IMDraw struct {
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points []point
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opts point
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@ -85,7 +85,6 @@ type point struct {
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col NRGBA
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pic Vec
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in float64
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width float64
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precision int
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endshape EndShape
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}
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@ -94,8 +93,11 @@ type point struct {
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type EndShape int
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const (
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// SharpEndShape is a square end shape.
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SharpEndShape EndShape = iota
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// NoEndShape leaves a line point with no special end shape.
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NoEndShape EndShape = iota
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// SharpEndShape is a sharp triangular end shape.
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SharpEndShape
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// RoundEndShape is a circular end shape.
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RoundEndShape
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@ -140,15 +142,14 @@ func (imd *IMDraw) Draw(t Target) {
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// the position.
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func (imd *IMDraw) Push(pts ...Vec) {
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for _, pt := range pts {
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imd.pushPt(pt)
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imd.pushPt(pt, imd.opts)
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}
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}
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func (imd *IMDraw) pushPt(pt Vec) {
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point := imd.opts
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point.pos = imd.matrix.Project(pt)
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point.col = imd.mask.Mul(point.col)
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imd.points = append(imd.points, point)
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func (imd *IMDraw) pushPt(pos Vec, pt point) {
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pt.pos = imd.matrix.Project(pos)
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pt.col = imd.mask.Mul(pt.col)
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imd.points = append(imd.points, pt)
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}
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// Color sets the color of the next Pushed points.
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@ -166,13 +167,6 @@ func (imd *IMDraw) Intensity(in float64) {
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imd.opts.in = in
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}
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// Width sets the with property of the next Pushed points.
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//
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// Note that this property does not apply to filled shapes.
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func (imd *IMDraw) Width(w float64) {
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imd.opts.width = w
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}
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// Precision sets the curve/circle drawing precision of the next Pushed points.
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//
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// It is the number of segments per 360 degrees.
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@ -207,88 +201,368 @@ func (imd *IMDraw) MakePicture(p Picture) TargetPicture {
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return imd.batch.MakePicture(p)
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}
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// FillConvexPolygon takes all points Pushed into the IM's queue and fills the convex polygon formed
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// by them.
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// Polygon draws a polygon from the Pushed points. If the thickness is 0, the convex polygon will be
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// filled. Otherwise, an outline of the specified thickness will be drawn. The outline does not have
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// to be convex.
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//
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// The polygon does not need to be exactly convex. The way it's drawn is that for each two adjacent
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// points, a triangle is constructed from those two points and the first Pushed point. You can use
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// this property to draw specific concave polygons.
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func (imd *IMDraw) FillConvexPolygon() {
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// Note, that the filled polygon does not have to be strictly convex. The way it's drawn is that a
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// triangle is drawn between each two adjacent points and the first Pushed point. You can use this
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// property to draw certain kinds of concave polygons.
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func (imd *IMDraw) Polygon(thickness float64) {
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if thickness == 0 {
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imd.fillPolygon()
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} else {
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imd.polyline(thickness, true)
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}
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}
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// Circle draws a circle of the specified radius around each Pushed point. If the thickness is 0,
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// the circle will be filled, otherwise a circle outline of the specified thickness will be drawn.
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func (imd *IMDraw) Circle(radius, thickness float64) {
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if thickness == 0 {
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imd.fillEllipseArc(V(radius, radius), 0, 2*math.Pi)
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} else {
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imd.outlineEllipseArc(V(radius, radius), 0, 2*math.Pi, thickness, false)
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}
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}
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// CircleArc draws a circle arc of the specified radius around each Pushed point. If the thickness
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// is 0, the arc will be filled, otherwise will be outlined. The arc starts at the low angle and
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// continues to the high angle. If low<high, the arc will be drawn counterclockwise. Otherwise it
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// will be clockwise. The angles are not normalized by any means.
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//
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// imd.CircleArc(40, 0, 8*math.Pi, 0)
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//
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// This line will fill the whole circle 4 times.
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func (imd *IMDraw) CircleArc(radius, low, high, thickness float64) {
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if thickness == 0 {
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imd.fillEllipseArc(V(radius, radius), low, high)
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} else {
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imd.outlineEllipseArc(V(radius, radius), low, high, thickness, true)
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}
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}
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// Ellipse draws an ellipse of the specified radius in each axis around each Pushed points. If the
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// thickness is 0, the ellipse will be filled, otherwise an ellipse outline of the specified
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// thickness will be drawn.
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func (imd *IMDraw) Ellipse(radius Vec, thickness float64) {
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if thickness == 0 {
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imd.fillEllipseArc(radius, 0, 2*math.Pi)
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} else {
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imd.outlineEllipseArc(radius, 0, 2*math.Pi, thickness, false)
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}
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}
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// EllipseArc draws an ellipse arc of the specified radius in each axis around each Pushed point. If
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// the thickness is 0, the arc will be filled, otherwise will be outlined. The arc starts at the low
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// angle and continues to the high angle. If low<high, the arc will be drawn counterclockwise.
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// Otherwise it will be clockwise. The angles are not normalized by any means.
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//
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// imd.EllipseArc(pixel.V(100, 50), 0, 8*math.Pi, 0)
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//
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// This line will fill the whole ellipse 4 times.
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func (imd *IMDraw) EllipseArc(radius Vec, low, high, thickness float64) {
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if thickness == 0 {
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imd.fillEllipseArc(radius, low, high)
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} else {
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imd.outlineEllipseArc(radius, low, high, thickness, true)
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}
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}
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// Line draws a polyline of the specified thickness between the Pushed points.
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func (imd *IMDraw) Line(thickness float64) {
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imd.polyline(thickness, false)
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}
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func (imd *IMDraw) getAndClearPoints() []point {
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points := imd.points
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imd.points = nil
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return points
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}
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func (imd *IMDraw) fillPolygon() {
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points := imd.getAndClearPoints()
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if len(points) < 3 {
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return
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}
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i := imd.tri.Len()
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off := imd.tri.Len()
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imd.tri.SetLen(imd.tri.Len() + 3*(len(points)-2))
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for j := 1; j+1 < len(points); j++ {
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(*imd.tri)[i+0].Position = points[0].pos
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(*imd.tri)[i+0].Color = points[0].col
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(*imd.tri)[i+0].Picture = points[0].pic
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(*imd.tri)[i+0].Intensity = points[0].in
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for i := 1; i+1 < len(points); i++ {
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(*imd.tri)[off].Position = points[0].pos
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(*imd.tri)[off].Color = points[0].col
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(*imd.tri)[off].Picture = points[0].pic
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(*imd.tri)[off].Intensity = points[0].in
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(*imd.tri)[i+1].Position = points[j].pos
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(*imd.tri)[i+1].Color = points[j].col
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(*imd.tri)[i+1].Picture = points[j].pic
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(*imd.tri)[i+1].Intensity = points[j].in
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(*imd.tri)[off+1].Position = points[i].pos
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(*imd.tri)[off+1].Color = points[i].col
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(*imd.tri)[off+1].Picture = points[i].pic
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(*imd.tri)[off+1].Intensity = points[i].in
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(*imd.tri)[i+2].Position = points[j+1].pos
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(*imd.tri)[i+2].Color = points[j+1].col
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(*imd.tri)[i+2].Picture = points[j+1].pic
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(*imd.tri)[i+2].Intensity = points[j+1].in
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(*imd.tri)[off+2].Position = points[i+1].pos
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(*imd.tri)[off+2].Color = points[i+1].col
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(*imd.tri)[off+2].Picture = points[i+1].pic
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(*imd.tri)[off+2].Intensity = points[i+1].in
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i += 3
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off += 3
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}
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imd.batch.Dirty()
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}
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// FillCircle draws a filled circle around each point in the IM's queue.
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func (imd *IMDraw) FillCircle(radius float64) {
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imd.FillEllipseArc(V(radius, radius), 0, 2*math.Pi)
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}
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// FillCircleArc draws a filled circle arc around each point in the IM's queue.
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func (imd *IMDraw) FillCircleArc(radius, low, high float64) {
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imd.FillEllipseArc(V(radius, radius), low, high)
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}
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// FillEllipse draws a filled ellipse around each point in the IM's queue.
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func (imd *IMDraw) FillEllipse(radius Vec) {
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imd.FillEllipseArc(radius, 0, 2*math.Pi)
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}
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// FillEllipseArc draws a filled ellipse arc around each point in the IM's queue. Low and high
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// angles are in radians.
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//
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// The arc is drawn starting at the low angle continuing to the high angle. If the high angle is
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// numerically greater than the low angle, the arc will be drawn counterclockwise, otherwise it will
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// be drawn clockwise.
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//
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// The angles are not normalized by any means. This will rotate four times in a full circle:
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//
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// imd.FillEllipseArc(pixel.V(100, 100), 0, 8*math.Pi)
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func (imd *IMDraw) FillEllipseArc(radius Vec, low, high float64) {
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points := imd.points
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imd.points = nil
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func (imd *IMDraw) fillEllipseArc(radius Vec, low, high float64) {
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points := imd.getAndClearPoints()
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for _, pt := range points {
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imd.pushPt(pt.pos) // center
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num := math.Ceil(math.Abs(high-low) / (2 * math.Pi) * float64(pt.precision))
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delta := (high - low) / num
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for i := 0.0; i <= num; i++ {
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angle := low + i*delta
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sin, cos := math.Sincos(angle)
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imd.pushPt(pt.pos + V(
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radius.X()*cos,
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radius.Y()*sin,
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))
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off := imd.tri.Len()
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imd.tri.SetLen(imd.tri.Len() + 3*int(num))
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for i := range (*imd.tri)[off:] {
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(*imd.tri)[off+i].Color = pt.col
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(*imd.tri)[off+i].Picture = 0
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(*imd.tri)[off+i].Intensity = 0
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}
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imd.FillConvexPolygon()
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for i := 0.0; i < num; i++ {
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angle := low + i*delta
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sin, cos := math.Sincos(angle)
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a := pt.pos + V(
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radius.X()*cos,
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radius.Y()*sin,
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)
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angle = low + (i+1)*delta
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sin, cos = math.Sincos(angle)
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b := pt.pos + V(
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radius.X()*cos,
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radius.Y()*sin,
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)
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(*imd.tri)[off+0].Position = pt.pos
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(*imd.tri)[off+1].Position = a
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(*imd.tri)[off+2].Position = b
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off += 3
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}
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imd.batch.Dirty()
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}
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}
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func (imd *IMDraw) outlineEllipseArc(radius Vec, low, high, thickness float64, doEndShape bool) {
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points := imd.getAndClearPoints()
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for _, pt := range points {
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num := math.Ceil(math.Abs(high-low) / (2 * math.Pi) * float64(pt.precision))
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delta := (high - low) / num
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off := imd.tri.Len()
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imd.tri.SetLen(imd.tri.Len() + 6*int(num))
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for i := range (*imd.tri)[off:] {
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(*imd.tri)[off+i].Color = pt.col
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(*imd.tri)[off+i].Picture = 0
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(*imd.tri)[off+i].Intensity = 0
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}
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for i := 0.0; i < num; i++ {
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angle := low + i*delta
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sin, cos := math.Sincos(angle)
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normalSin, normalCos := V(sin, cos).ScaledXY(radius).Unit().XY()
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a := pt.pos + V(
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radius.X()*cos-thickness/2*normalCos,
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radius.Y()*sin-thickness/2*normalSin,
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)
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b := pt.pos + V(
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radius.X()*cos+thickness/2*normalCos,
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radius.Y()*sin+thickness/2*normalSin,
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)
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angle = low + (i+1)*delta
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sin, cos = math.Sincos(angle)
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normalSin, normalCos = V(sin, cos).ScaledXY(radius).Unit().XY()
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c := pt.pos + V(
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radius.X()*cos-thickness/2*normalCos,
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radius.Y()*sin-thickness/2*normalSin,
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)
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d := pt.pos + V(
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radius.X()*cos+thickness/2*normalCos,
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radius.Y()*sin+thickness/2*normalSin,
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)
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(*imd.tri)[off+0].Position = a
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(*imd.tri)[off+1].Position = b
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(*imd.tri)[off+2].Position = c
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(*imd.tri)[off+3].Position = c
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(*imd.tri)[off+4].Position = b
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(*imd.tri)[off+5].Position = d
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off += 6
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}
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imd.batch.Dirty()
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if doEndShape {
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lowSin, lowCos := math.Sincos(low)
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lowCenter := pt.pos + V(
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radius.X()*lowCos,
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radius.Y()*lowSin,
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)
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normalLowSin, normalLowCos := V(lowSin, lowCos).ScaledXY(radius).Unit().XY()
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normalLow := V(normalLowCos, normalLowSin).Angle()
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highSin, highCos := math.Sincos(high)
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highCenter := pt.pos + V(
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radius.X()*highCos,
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radius.Y()*highSin,
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)
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normalHighSin, normalHighCos := V(highSin, highCos).ScaledXY(radius).Unit().XY()
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normalHigh := V(normalHighCos, normalHighSin).Angle()
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orientation := 1.0
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if low > high {
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orientation = -1.0
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}
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switch pt.endshape {
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case NoEndShape:
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// nothing
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case SharpEndShape:
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thick := X(thickness / 2).Rotated(normalLow)
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imd.pushPt(lowCenter+thick, pt)
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imd.pushPt(lowCenter-thick, pt)
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imd.pushPt(lowCenter-thick.Rotated(math.Pi/2*orientation), pt)
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imd.fillPolygon()
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thick = X(thickness / 2).Rotated(normalHigh)
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imd.pushPt(highCenter+thick, pt)
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imd.pushPt(highCenter-thick, pt)
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imd.pushPt(highCenter+thick.Rotated(math.Pi/2*orientation), pt)
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imd.fillPolygon()
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case RoundEndShape:
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imd.pushPt(lowCenter, pt)
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imd.fillEllipseArc(V(thickness, thickness)/2, normalLow, normalLow-math.Pi*orientation)
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imd.pushPt(highCenter, pt)
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imd.fillEllipseArc(V(thickness, thickness)/2, normalHigh, normalHigh+math.Pi*orientation)
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}
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}
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}
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}
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func (imd *IMDraw) polyline(thickness float64, closed bool) {
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points := imd.getAndClearPoints()
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// filter identical adjacent points
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filtered := points[:0]
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for i := 0; i < len(points); i++ {
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if closed || i+1 < len(points) {
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j := (i + 1) % len(points)
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if points[i].pos != points[j].pos {
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filtered = append(filtered, points[i])
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}
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}
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}
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points = filtered
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if len(points) < 2 {
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return
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}
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// first point
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j, i := 0, 1
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normal := (points[i].pos - points[j].pos).Rotated(math.Pi / 2).Unit().Scaled(thickness / 2)
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if !closed {
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switch points[j].endshape {
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case NoEndShape:
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// nothing
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case SharpEndShape:
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imd.pushPt(points[j].pos+normal, points[j])
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imd.pushPt(points[j].pos-normal, points[j])
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imd.pushPt(points[j].pos+normal.Rotated(math.Pi/2), points[j])
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imd.fillPolygon()
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case RoundEndShape:
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imd.pushPt(points[j].pos, points[j])
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imd.fillEllipseArc(V(thickness, thickness)/2, normal.Angle(), normal.Angle()+math.Pi)
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}
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}
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imd.pushPt(points[j].pos+normal, points[j])
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imd.pushPt(points[j].pos-normal, points[j])
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// middle points
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for i := 0; i < len(points); i++ {
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j, k := i+1, i+2
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closing := false
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if j >= len(points) {
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if !closed {
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break
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}
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j %= len(points)
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closing = true
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}
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if k >= len(points) {
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k %= len(points)
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}
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ijNormal := (points[j].pos - points[i].pos).Rotated(math.Pi / 2).Unit().Scaled(thickness / 2)
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jkNormal := (points[k].pos - points[j].pos).Rotated(math.Pi / 2).Unit().Scaled(thickness / 2)
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orientation := 1.0
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if ijNormal.Cross(jkNormal) > 0 {
|
||||
orientation = -1.0
|
||||
}
|
||||
|
||||
imd.pushPt(points[j].pos-ijNormal, points[j])
|
||||
imd.pushPt(points[j].pos+ijNormal, points[j])
|
||||
imd.fillPolygon()
|
||||
|
||||
switch points[j].endshape {
|
||||
case NoEndShape:
|
||||
// nothing
|
||||
case SharpEndShape:
|
||||
imd.pushPt(points[j].pos, points[j])
|
||||
imd.pushPt(points[j].pos+ijNormal.Scaled(orientation), points[j])
|
||||
imd.pushPt(points[j].pos+jkNormal.Scaled(orientation), points[j])
|
||||
imd.fillPolygon()
|
||||
case RoundEndShape:
|
||||
imd.pushPt(points[j].pos, points[j])
|
||||
imd.fillEllipseArc(V(thickness, thickness)/2, ijNormal.Angle(), ijNormal.Angle()-math.Pi)
|
||||
imd.pushPt(points[j].pos, points[j])
|
||||
imd.fillEllipseArc(V(thickness, thickness)/2, jkNormal.Angle(), jkNormal.Angle()+math.Pi)
|
||||
}
|
||||
|
||||
if !closing {
|
||||
imd.pushPt(points[j].pos+jkNormal, points[j])
|
||||
imd.pushPt(points[j].pos-jkNormal, points[j])
|
||||
}
|
||||
}
|
||||
|
||||
// last point
|
||||
i, j = len(points)-2, len(points)-1
|
||||
normal = (points[j].pos - points[i].pos).Rotated(math.Pi / 2).Unit().Scaled(thickness / 2)
|
||||
|
||||
imd.pushPt(points[j].pos-normal, points[j])
|
||||
imd.pushPt(points[j].pos+normal, points[j])
|
||||
imd.fillPolygon()
|
||||
|
||||
if !closed {
|
||||
switch points[j].endshape {
|
||||
case NoEndShape:
|
||||
// nothing
|
||||
case SharpEndShape:
|
||||
imd.pushPt(points[j].pos+normal, points[j])
|
||||
imd.pushPt(points[j].pos-normal, points[j])
|
||||
imd.pushPt(points[j].pos+normal.Rotated(-math.Pi/2), points[j])
|
||||
imd.fillPolygon()
|
||||
case RoundEndShape:
|
||||
imd.pushPt(points[j].pos, points[j])
|
||||
imd.fillEllipseArc(V(thickness, thickness)/2, normal.Angle(), normal.Angle()-math.Pi)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue