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| -rw-r--r-- | fpdf_test.go | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/fpdf_test.go b/fpdf_test.go index 9ac1e18..1f500fc 100644 --- a/fpdf_test.go +++ b/fpdf_test.go @@ -26,6 +26,7 @@ import ( "net/http" "os" "path/filepath" + "strconv" "strings" "github.com/jung-kurt/gofpdf" @@ -1516,3 +1517,78 @@ func ExampleFpdf_tutorial31() { // Output: // Successfully generated pdf/tutorial31.pdf } + +// This example demonstrates the Path Drawing functions, such as: MoveTo, +// LineTo, CurveTo, ..., ClosePath and DrawPath. +func ExampleFpdf_tutorial32() { + pdf := gofpdf.New("P", "mm", "A4", "") + pdf.SetDrawColor(0xff, 0x00, 0x00) + pdf.SetFillColor(0x99, 0x99, 0x99) + pdf.SetFont("Helvetica", "", 15) + pdf.AddPage() + pdf.SetAlpha(1, "Multiply") + var ( + polygon = func(cx, cy, r, n, dir float64) { + da := 2 * math.Pi / n + pdf.MoveTo(cx+r, cy) + pdf.Text(cx+r, cy, "0") + i := 1 + for a := da; a < 2*math.Pi; a += da { + x, y := cx+r*math.Cos(dir*a), cy+r*math.Sin(dir*a) + pdf.LineTo(x, y) + pdf.Text(x, y, strconv.Itoa(i)) + i += 1 + } + pdf.ClosePath() + } + polygons = func(cx, cy, r, n, dir float64) { + d := 1.0 + for rf := r; rf > 0; rf -= 10 { + polygon(cx, cy, rf, n, d) + d *= dir + } + } + star = func(cx, cy, r, n float64) { + da := 4 * math.Pi / n + pdf.MoveTo(cx+r, cy) + for a := da; a < 4*math.Pi+da; a += da { + x, y := cx+r*math.Cos(a), cy+r*math.Sin(a) + pdf.LineTo(x, y) + } + pdf.ClosePath() + } + ) + // triangle + polygons(55, 45, 40, 3, 1) + pdf.DrawPath("B") + pdf.Text(15, 95, "B (same direction, non zero winding)") + + // square + polygons(155, 45, 40, 4, 1) + pdf.DrawPath("B*") + pdf.Text(115, 95, "B* (same direction, even odd)") + + // pentagon + polygons(55, 145, 40, 5, -1) + pdf.DrawPath("B") + pdf.Text(15, 195, "B (different direction, non zero winding)") + + // hexagon + polygons(155, 145, 40, 6, -1) + pdf.DrawPath("B*") + pdf.Text(115, 195, "B* (different direction, even odd)") + + // star + star(55, 245, 40, 5) + pdf.DrawPath("B") + pdf.Text(15, 290, "B (non zero winding)") + + // star + star(155, 245, 40, 5) + pdf.DrawPath("B*") + pdf.Text(115, 290, "B* (even odd)") + + pdf.OutputAndClose(docWriter(pdf, 32)) + // Output: + // Successfully generated pdf/tutorial32.pdf +} |