diff --git a/paths.go b/paths.go index adc736f..5d33f48 100644 --- a/paths.go +++ b/paths.go @@ -19,15 +19,30 @@ func (cv *Canvas) BeginPath() { cv.polyPath = cv.polyPath[:0] } +func isSamePoint(a, b lm.Vec2, maxDist float32) bool { + return fmath.Abs(b[0]-a[0]) <= maxDist && fmath.Abs(b[1]-a[1]) <= maxDist +} + func (cv *Canvas) MoveTo(x, y float32) { tf := cv.tf(lm.Vec2{x, y}) + if len(cv.linePath) > 0 && isSamePoint(cv.linePath[len(cv.linePath)-1].tf, tf, 0.1) { + return + } cv.linePath = append(cv.linePath, pathPoint{pos: lm.Vec2{x, y}, tf: tf, move: true}) cv.polyPath = append(cv.polyPath, pathPoint{pos: lm.Vec2{x, y}, tf: tf, move: true}) } func (cv *Canvas) LineTo(x, y float32) { + cv.strokeLineTo(x, y) + cv.fillLineTo(x, y) +} + +func (cv *Canvas) strokeLineTo(x, y float32) { + if len(cv.linePath) > 0 && isSamePoint(cv.linePath[len(cv.linePath)-1].tf, cv.tf(lm.Vec2{x, y}), 0.1) { + return + } if len(cv.linePath) == 0 { - cv.MoveTo(x, y) + cv.linePath = append(cv.linePath, pathPoint{pos: lm.Vec2{x, y}, tf: cv.tf(lm.Vec2{x, y}), move: true}) return } if len(cv.state.lineDash) > 0 { @@ -69,6 +84,16 @@ func (cv *Canvas) LineTo(x, y float32) { cv.linePath[len(cv.linePath)-1].attach = true cv.linePath = append(cv.linePath, pathPoint{pos: lm.Vec2{x, y}, tf: tf, move: false}) } +} + +func (cv *Canvas) fillLineTo(x, y float32) { + if len(cv.polyPath) > 0 && isSamePoint(cv.polyPath[len(cv.polyPath)-1].tf, cv.tf(lm.Vec2{x, y}), 0.1) { + return + } + if len(cv.polyPath) == 0 { + cv.polyPath = append(cv.polyPath, pathPoint{pos: lm.Vec2{x, y}, tf: cv.tf(lm.Vec2{x, y}), move: true}) + return + } tf := cv.tf(lm.Vec2{x, y}) cv.polyPath[len(cv.polyPath)-1].next = tf cv.polyPath[len(cv.polyPath)-1].attach = true @@ -140,16 +165,12 @@ func (cv *Canvas) ClosePath() { if len(cv.linePath) < 2 { return } - if len(cv.state.lineDash) > 0 { - cv.LineTo(cv.linePath[0].pos[0], cv.linePath[0].pos[1]) + if isSamePoint(cv.linePath[len(cv.linePath)-1].tf, cv.linePath[0].tf, 0.1) { return } - cv.linePath[len(cv.linePath)-1].next = cv.linePath[0].pos - cv.linePath[len(cv.linePath)-1].attach = true - cv.linePath = append(cv.linePath, pathPoint{pos: cv.linePath[0].pos, move: false, tf: cv.linePath[0].tf, next: cv.linePath[1].pos, attach: true}) - cv.polyPath[len(cv.polyPath)-1].next = cv.polyPath[0].pos - cv.polyPath[len(cv.polyPath)-1].attach = true - cv.polyPath = append(cv.polyPath, pathPoint{pos: cv.polyPath[0].pos, move: false, tf: cv.linePath[0].tf, next: cv.polyPath[1].pos, attach: true}) + cv.LineTo(cv.linePath[0].pos[0], cv.linePath[0].pos[1]) + cv.linePath[len(cv.linePath)-1].next = cv.linePath[0].tf + cv.polyPath[len(cv.polyPath)-1].next = cv.polyPath[0].tf } func (cv *Canvas) Stroke() { @@ -268,8 +289,8 @@ func (cv *Canvas) lineJoint(p pathPoint, p0, p1, p2, l0p0, l0p1, l0p2, l0p3 lm.V l1p2 := p2.Add(v3) l1p3 := p1.Add(v3) - ip0 := lineIntersection(l0p0, l0p1, l1p1, l1p0) - ip1 := lineIntersection(l0p2, l0p3, l1p3, l1p2) + ip0, _ := lineIntersection(l0p0, l0p1, l1p1, l1p0) + ip1, _ := lineIntersection(l0p2, l0p3, l1p3, l1p2) tris = append(tris, p1[0], p1[1], l0p1[0], l0p1[1], ip0[0], ip0[1], @@ -307,17 +328,17 @@ func (cv *Canvas) addCircleTris(center lm.Vec2, radius float32, tris []float32) return tris } -func lineIntersection(a0, a1, b0, b1 lm.Vec2) lm.Vec2 { +func lineIntersection(a0, a1, b0, b1 lm.Vec2) (lm.Vec2, float32) { va := a1.Sub(a0) vb := b1.Sub(b0) if vb[1] == 0 { - q := (a0[0] + (b0[1]-a0[1])*(va[0]/va[1]) - b0[0]) / (vb[0] - vb[1]*(va[0]/va[1])) - return b0.Add(vb.MulF(q)) + r := (b0[1] + (a0[0]-b0[0])*(vb[1]/vb[0]) - a0[1]) / (va[1] - va[0]*(vb[1]/vb[0])) + return a0.Add(va.MulF(r)), r } - p := (b0[0] + (a0[1]-b0[1])*(vb[0]/vb[1]) - a0[0]) / (va[0] - va[1]*(vb[0]/vb[1])) - return a0.Add(va.MulF(p)) + r := (b0[0] + (a0[1]-b0[1])*(vb[0]/vb[1]) - a0[0]) / (va[0] - va[1]*(vb[0]/vb[1])) + return a0.Add(va.MulF(r)), r } func (cv *Canvas) Fill() {