func drawScissor(ctx *nanovgo.Context, x, y, t float32) {
ctx.Save()
// Draw first rect and set scissor to it's area.
ctx.Translate(x, y)
ctx.Rotate(nanovgo.DegToRad(5))
ctx.BeginPath()
ctx.Rect(-20, -20, 60, 40)
ctx.SetFillColor(nanovgo.RGBA(255, 0, 0, 255))
ctx.Fill()
ctx.Scissor(-20, -20, 60, 40)
// Draw second rectangle with offset and rotation.
ctx.Translate(40, 0)
ctx.Rotate(t)
// Draw the intended second rectangle without any scissoring.
ctx.Save()
ctx.ResetScissor()
ctx.BeginPath()
ctx.Rect(-20, -10, 60, 30)
ctx.SetFillColor(nanovgo.RGBA(255, 128, 0, 64))
ctx.Fill()
ctx.Restore()
// Draw second rectangle with combined scissoring.
ctx.IntersectScissor(-20, -10, 60, 30)
ctx.BeginPath()
ctx.Rect(-20, -10, 60, 30)
ctx.SetFillColor(nanovgo.RGBA(255, 128, 0, 255))
ctx.Fill()
ctx.Restore()
}
func (v *VScrollPanel) Draw(self Widget, ctx *nanovgo.Context) {
if len(v.children) == 0 {
return
}
x := float32(v.x)
y := float32(v.y)
w := float32(v.w)
h := float32(v.h)
child := v.children[0]
layout := self.Layout()
if layout != nil {
_, v.childPreferredHeight = layout.PreferredSize(self, ctx)
} else {
_, v.childPreferredHeight = child.PreferredSize(child, ctx)
}
ctx.Save()
ctx.Translate(x, y)
ctx.Scissor(0, 0, w, h)
ctx.Translate(0, -v.scroll*(float32(v.childPreferredHeight)-h))
if child.Visible() {
child.Draw(child, ctx)
}
ctx.Restore()
if v.childPreferredHeight > v.h {
scrollH := h * minF(1.0, h/float32(v.childPreferredHeight))
scrollH = minF(maxF(20.0, scrollH), h)
paint := nanovgo.BoxGradient(x+w-12+1, y+4+1, 8, h-8, 3, 4, nanovgo.MONO(0, 32), nanovgo.MONO(0, 92))
ctx.BeginPath()
ctx.RoundedRect(x+w-12, y+4, 8, h-8, 3)
ctx.SetFillPaint(paint)
ctx.Fill()
barPaint := nanovgo.BoxGradient(x+y-12-1, y+4+1+(h-8-scrollH)*v.scroll-1, 8, scrollH, 3, 4, nanovgo.MONO(220, 100), nanovgo.MONO(128, 100))
ctx.BeginPath()
ctx.RoundedRect(x+w-12+1, y+4+1+(h-8-scrollH)*v.scroll, 8-2, scrollH-2, 2)
ctx.SetFillPaint(barPaint)
ctx.Fill()
}
}
// Draw() draws the widget (and all child widgets)
func (w *WidgetImplement) Draw(self Widget, ctx *nanovgo.Context) {
if debugFlag {
ctx.SetStrokeWidth(1.0)
ctx.BeginPath()
ctx.Rect(float32(w.x)-0.5, float32(w.y)-0.5, float32(w.w)+1.0, float32(w.h)+1.0)
ctx.SetStrokeColor(nanovgo.RGBA(255, 0, 0, 255))
ctx.Stroke()
}
if len(w.children) == 0 {
return
}
ctx.Translate(float32(w.x), float32(w.y))
// draw depth 0 items
var drawLater widgetsAsc = make([]Widget, 0, len(w.children))
for _, child := range w.children {
if child.Visible() {
depth := child.Depth()
if depth == 0 {
cx, cy := child.Position()
cw, ch := child.Size()
if !self.IsClipped(cx, cy, cw, ch) {
child.Draw(child, ctx)
}
} else {
drawLater = append(drawLater, child)
}
}
}
// draw by depth order
sort.Sort(drawLater)
for _, child := range drawLater {
cx, cy := child.Position()
cw, ch := child.Size()
if !self.IsClipped(cx, cy, cw, ch) {
child.Draw(child, ctx)
}
}
ctx.Translate(-float32(w.x), -float32(w.y))
}
func (c *ColorWheel) Draw(self Widget, ctx *nanovgo.Context) {
c.WidgetImplement.Draw(self, ctx)
if !c.visible {
return
}
x := float32(c.x)
y := float32(c.y)
w := float32(c.w)
h := float32(c.h)
ctx.Save()
defer ctx.Restore()
cx := x + w*0.5
cy := y + h*0.5
r1 := toF(w < h, w, h)*0.5 - 5.0
r0 := r1 * 0.75
aeps := 0.7 / r1 // half a pixel arc length in radians (2pi cancels out).
for i := 0; i < 6; i++ {
a0 := float32(i)/6.0*nanovgo.PI*2.0 - aeps
a1 := float32(i+1)/6.0*nanovgo.PI*2.0 + aeps
ctx.BeginPath()
ctx.Arc(cx, cy, r0, a0, a1, nanovgo.Clockwise)
ctx.Arc(cx, cy, r1, a1, a0, nanovgo.CounterClockwise)
ctx.ClosePath()
sin1, cos1 := sinCosF(a0)
sin2, cos2 := sinCosF(a1)
ax := cx + cos1*(r0+r1)*0.5
ay := cy + sin1*(r0+r1)*0.5
bx := cx + cos2*(r0+r1)*0.5
by := cy + sin2*(r0+r1)*0.5
color1 := nanovgo.HSLA(a0/(nanovgo.PI*2), 1.0, 0.55, 255)
color2 := nanovgo.HSLA(a1/(nanovgo.PI*2), 1.0, 0.55, 255)
paint := nanovgo.LinearGradient(ax, ay, bx, by, color1, color2)
ctx.SetFillPaint(paint)
ctx.Fill()
}
ctx.BeginPath()
ctx.Circle(cx, cy, r0-0.5)
ctx.Circle(cx, cy, r1+0.5)
ctx.SetStrokeColor(nanovgo.MONO(0, 64))
ctx.Stroke()
// Selector
ctx.Save()
defer ctx.Restore()
ctx.Translate(cx, cy)
ctx.Rotate(c.hue * nanovgo.PI * 2)
// Marker on
u := clampF(r1/50, 1.5, 4.0)
ctx.SetStrokeWidth(u)
ctx.BeginPath()
ctx.Rect(r0-1, -2*u, r1-r0+2, 4*u)
ctx.SetStrokeColor(nanovgo.MONO(255, 192))
ctx.Stroke()
paint := nanovgo.BoxGradient(r0-3, -5, r1-r0+6, 10, 2, 4, nanovgo.MONO(0, 128), nanovgo.MONO(0, 0))
ctx.BeginPath()
ctx.Rect(r0-2-10, -4-10, r1-r0+4+20, 8+20)
ctx.Rect(r0-2, -4, r1-r0+4, 8)
ctx.PathWinding(nanovgo.Hole)
ctx.SetFillPaint(paint)
ctx.Fill()
// Center triangle
r := r0 - 6
sin1, cos1 := sinCosF(120.0 / 180.0 * nanovgo.PI)
sin2, cos2 := sinCosF(-120.0 / 180.0 * nanovgo.PI)
ax := cos1 * r
ay := sin1 * r
bx := cos2 * r
by := sin2 * r
ctx.BeginPath()
ctx.MoveTo(r, 0)
ctx.LineTo(ax, ay)
ctx.LineTo(bx, by)
ctx.ClosePath()
triPaint1 := nanovgo.LinearGradient(r, 0, ax, ay, nanovgo.HSL(c.hue, 1.0, 0.5), nanovgo.MONO(255, 255))
ctx.SetFillPaint(triPaint1)
ctx.Fill()
triPaint2 := nanovgo.LinearGradient((r+ax)*0.5, ay*0.5, bx, by, nanovgo.MONO(0, 0), nanovgo.MONO(0, 255))
ctx.SetFillPaint(triPaint2)
ctx.Fill()
// selector circle on triangle
px, py := c.calculatePosition()
ctx.SetStrokeWidth(u)
ctx.BeginPath()
ctx.Circle(px, py, 2*u)
ctx.SetStrokeColor(nanovgo.MONO(255, 192))
ctx.Stroke()
}
func drawColorWheel(ctx *nanovgo.Context, x, y, w, h, t float32) {
var r0, r1, ax, ay, bx, by, aeps, r float32
hue := sinF(t * 0.12)
ctx.Save()
defer ctx.Restore()
/* ctx.BeginPath()
ctx.Rect(x,y,w,h)
ctx.FillColor(nanovgo.RGBA(255,0,0,128))
ctx.Fill()*/
cx := x + w*0.5
cy := y + h*0.5
if w < h {
r1 = w*0.5 - 5.0
} else {
r1 = h*0.5 - 5.0
}
r0 = r1 - 20.0
aeps = 0.5 / r1 // half a pixel arc length in radians (2pi cancels out).
for i := 0; i < 6; i++ {
a0 := float32(i)/6.0*nanovgo.PI*2.0 - aeps
a1 := float32(i+1.0)/6.0*nanovgo.PI*2.0 + aeps
ctx.BeginPath()
ctx.Arc(cx, cy, r0, a0, a1, nanovgo.Clockwise)
ctx.Arc(cx, cy, r1, a1, a0, nanovgo.CounterClockwise)
ctx.ClosePath()
ax = cx + cosF(a0)*(r0+r1)*0.5
ay = cy + sinF(a0)*(r0+r1)*0.5
bx = cx + cosF(a1)*(r0+r1)*0.5
by = cy + sinF(a1)*(r0+r1)*0.5
paint := nanovgo.LinearGradient(ax, ay, bx, by, nanovgo.HSLA(a0/(nanovgo.PI*2), 1.0, 0.55, 255), nanovgo.HSLA(a1/(nanovgo.PI*2), 1.0, 0.55, 255))
ctx.SetFillPaint(paint)
ctx.Fill()
}
ctx.BeginPath()
ctx.Circle(cx, cy, r0-0.5)
ctx.Circle(cx, cy, r1+0.5)
ctx.SetStrokeColor(nanovgo.RGBA(0, 0, 0, 64))
ctx.SetStrokeWidth(1.0)
ctx.Stroke()
// Selector
ctx.Translate(cx, cy)
ctx.Rotate(hue * nanovgo.PI * 2)
// Marker on
ctx.SetStrokeWidth(2.0)
ctx.BeginPath()
ctx.Rect(r0-1, -3, r1-r0+2, 6)
ctx.SetStrokeColor(nanovgo.RGBA(255, 255, 255, 192))
ctx.Stroke()
paint := nanovgo.BoxGradient(r0-3, -5, r1-r0+6, 10, 2, 4, nanovgo.RGBA(0, 0, 0, 128), nanovgo.RGBA(0, 0, 0, 0))
ctx.BeginPath()
ctx.Rect(r0-2-10, -4-10, r1-r0+4+20, 8+20)
ctx.Rect(r0-2, -4, r1-r0+4, 8)
ctx.PathWinding(nanovgo.Hole)
ctx.SetFillPaint(paint)
ctx.Fill()
// Center triangle
r = r0 - 6
ax = cosF(120.0/180.0*nanovgo.PI) * r
ay = sinF(120.0/180.0*nanovgo.PI) * r
bx = cosF(-120.0/180.0*nanovgo.PI) * r
by = sinF(-120.0/180.0*nanovgo.PI) * r
ctx.BeginPath()
ctx.MoveTo(r, 0)
ctx.LineTo(ax, ay)
ctx.LineTo(bx, by)
ctx.ClosePath()
paint = nanovgo.LinearGradient(r, 0, ax, ay, nanovgo.HSLA(hue, 1.0, 0.5, 255), nanovgo.RGBA(255, 255, 255, 255))
ctx.SetFillPaint(paint)
ctx.Fill()
paint = nanovgo.LinearGradient((r+ax)*0.5, (0+ay)*0.5, bx, by, nanovgo.RGBA(0, 0, 0, 0), nanovgo.RGBA(0, 0, 0, 255))
ctx.SetFillPaint(paint)
ctx.Fill()
ctx.SetStrokeColor(nanovgo.RGBA(0, 0, 0, 64))
ctx.Stroke()
// Select circle on triangle
ax = cosF(120.0/180.0*nanovgo.PI) * r * 0.3
ay = sinF(120.0/180.0*nanovgo.PI) * r * 0.4
ctx.SetStrokeWidth(2.0)
ctx.BeginPath()
ctx.Circle(ax, ay, 5)
ctx.SetStrokeColor(nanovgo.RGBA(255, 255, 255, 192))
ctx.Stroke()
paint = nanovgo.RadialGradient(ax, ay, 7, 9, nanovgo.RGBA(0, 0, 0, 64), nanovgo.RGBA(0, 0, 0, 0))
ctx.BeginPath()
ctx.Rect(ax-20, ay-20, 40, 40)
ctx.Circle(ax, ay, 7)
ctx.PathWinding(nanovgo.Hole)
ctx.SetFillPaint(paint)
ctx.Fill()
}
func drawThumbnails(ctx *nanovgo.Context, x, y, w, h float32, images []int, t float32) {
var cornerRadius float32 = 3.0
var thumb float32 = 60.0
var arry float32 = 30.5
stackh := float32(len(images)/2)*(thumb+10) + 10
u := (1 + cosF(t*0.5)) * 0.5
u2 := (1 - cosF(t*0.2)) * 0.5
ctx.Save()
defer ctx.Restore()
// Drop shadow
shadowPaint := nanovgo.BoxGradient(x, y+4, w, h, cornerRadius*2, 20, nanovgo.RGBA(0, 0, 0, 128), nanovgo.RGBA(0, 0, 0, 0))
ctx.BeginPath()
ctx.Rect(x-10, y-10, w+20, h+30)
ctx.RoundedRect(x, y, w, h, cornerRadius)
ctx.PathWinding(nanovgo.Hole)
ctx.SetFillPaint(shadowPaint)
ctx.Fill()
// Window
ctx.BeginPath()
ctx.RoundedRect(x, y, w, h, cornerRadius)
ctx.MoveTo(x-10, y+arry)
ctx.LineTo(x+1, y+arry-11)
ctx.LineTo(x+1, y+arry+11)
ctx.SetFillColor(nanovgo.RGBA(200, 200, 200, 255))
ctx.Fill()
ctx.Block(func() {
ctx.Scissor(x, y, w, h)
ctx.Translate(0, -(stackh-h)*u)
dv := 1.0 / float32(len(images)-1)
for i, imageID := range images {
tx := x + 10.0
ty := y + 10.0
tx += float32(i%2) * (thumb + 10.0)
ty += float32(i/2) * (thumb + 10.0)
imgW, imgH, _ := ctx.ImageSize(imageID)
var iw, ih, ix, iy float32
if imgW < imgH {
iw = thumb
ih = iw * float32(imgH) / float32(imgW)
ix = 0
iy = -(ih - thumb) * 0.5
} else {
ih = thumb
iw = ih * float32(imgW) / float32(imgH)
ix = -(iw - thumb) * 0.5
iy = 0
}
v := float32(i) * dv
a := clampF((u2-v)/dv, 0, 1)
if a < 1.0 {
drawSpinner(ctx, tx+thumb/2, ty+thumb/2, thumb*0.25, t)
}
imgPaint := nanovgo.ImagePattern(tx+ix, ty+iy, iw, ih, 0.0/180.0*nanovgo.PI, imageID, a)
ctx.BeginPath()
ctx.RoundedRect(tx, ty, thumb, thumb, 5)
ctx.SetFillPaint(imgPaint)
ctx.Fill()
shadowPaint := nanovgo.BoxGradient(tx-1, ty, thumb+2, thumb+2, 5, 3, nanovgo.RGBA(0, 0, 0, 128), nanovgo.RGBA(0, 0, 0, 0))
ctx.BeginPath()
ctx.Rect(tx-5, ty-5, thumb+10, thumb+10)
ctx.RoundedRect(tx, ty, thumb, thumb, 6)
ctx.PathWinding(nanovgo.Hole)
ctx.SetFillPaint(shadowPaint)
ctx.Fill()
ctx.BeginPath()
ctx.RoundedRect(tx+0.5, ty+0.5, thumb-1, thumb-1, 4-0.5)
ctx.SetStrokeWidth(1.0)
ctx.SetStrokeColor(nanovgo.RGBA(255, 255, 255, 192))
ctx.Stroke()
}
})
// Hide fades
fadePaint := nanovgo.LinearGradient(x, y, x, y+6, nanovgo.RGBA(200, 200, 200, 255), nanovgo.RGBA(200, 200, 200, 0))
ctx.BeginPath()
ctx.Rect(x+4, y, w-8, 6)
ctx.SetFillPaint(fadePaint)
ctx.Fill()
fadePaint = nanovgo.LinearGradient(x, y+h, x, y+h-6, nanovgo.RGBA(200, 200, 200, 255), nanovgo.RGBA(200, 200, 200, 0))
ctx.BeginPath()
ctx.Rect(x+4, y+h-6, w-8, 6)
ctx.SetFillPaint(fadePaint)
ctx.Fill()
// Scroll bar
shadowPaint = nanovgo.BoxGradient(x+w-12+1, y+4+1, 8, h-8, 3, 4, nanovgo.RGBA(0, 0, 0, 32), nanovgo.RGBA(0, 0, 0, 92))
ctx.BeginPath()
ctx.RoundedRect(x+w-12, y+4, 8, h-8, 3)
ctx.SetFillPaint(shadowPaint)
// ctx.FillColor(ctx.RGBA(255,0,0,128));
ctx.Fill()
scrollH := (h / stackh) * (h - 8)
shadowPaint = nanovgo.BoxGradient(x+w-12-1, y+4+(h-8-scrollH)*u-1, 8, scrollH, 3, 4, nanovgo.RGBA(220, 220, 220, 255), nanovgo.RGBA(128, 128, 128, 255))
ctx.BeginPath()
ctx.RoundedRect(x+w-12+1, y+4+1+(h-8-scrollH)*u, 8-2, scrollH-2, 2)
ctx.SetFillPaint(shadowPaint)
// ctx.FillColor(ctx.RGBA(0,0,0,128));
ctx.Fill()
}