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authorKurt Jung <kurt.w.jung@code.google.com>2013-09-10 18:07:03 -0400
committerKurt Jung <kurt.w.jung@code.google.com>2013-09-10 18:07:03 -0400
commitf1a73860a6601291cff879e540465b371d5e2a90 (patch)
treee0ef365ce6e0d51aeba1d2f68ac7db5770b14ce9
parentc87ed4686551a1a724c87f35185652b59e6cc1ef (diff)
Export transformation matrix fields
-rw-r--r--fpdftrans.go32
1 files changed, 17 insertions, 15 deletions
diff --git a/fpdftrans.go b/fpdftrans.go
index fe9b1bc..b11a853 100644
--- a/fpdftrans.go
+++ b/fpdftrans.go
@@ -10,7 +10,7 @@ import (
// The matrix used for generalized transformations of text, drawings and images.
type TransformMatrix struct {
- a, b, c, d, e, f float64
+ A, B, C, D, E, F float64
}
// Set up a transformation context for subsequent text, drawings and images.
@@ -57,7 +57,8 @@ func (f *Fpdf) TransformScale(scaleWd, scaleHt, x, y float64) {
x *= f.k
scaleWd /= 100
scaleHt /= 100
- f.Transform(TransformMatrix{scaleWd, 0, 0, scaleHt, x * (1 - scaleWd), y * (1 - scaleHt)})
+ f.Transform(TransformMatrix{scaleWd, 0, 0,
+ scaleHt, x * (1 - scaleWd), y * (1 - scaleHt)})
}
// Horizontally mirror the following text, drawings and images. x is the axis
@@ -112,12 +113,12 @@ func (f *Fpdf) TransformRotate(angle, x, y float64) {
x *= f.k
angle = angle * math.Pi / 180
var tm TransformMatrix
- tm.a = math.Cos(angle)
- tm.b = math.Sin(angle)
- tm.c = -tm.b
- tm.d = tm.a
- tm.e = x + tm.b*y - tm.a*x
- tm.f = y - tm.a*y - tm.b*x
+ tm.A = math.Cos(angle)
+ tm.B = math.Sin(angle)
+ tm.C = -tm.B
+ tm.D = tm.A
+ tm.E = x + tm.B*y - tm.A*x
+ tm.F = y - tm.A*y - tm.B*x
f.Transform(tm)
}
@@ -147,12 +148,12 @@ func (f *Fpdf) TransformSkew(angleX, angleY, x, y float64) {
x *= f.k
y = (f.h - y) * f.k
var tm TransformMatrix
- tm.a = 1
- tm.b = math.Tan(angleY * math.Pi / 180)
- tm.c = math.Tan(angleX * math.Pi / 180)
- tm.d = 1
- tm.e = -tm.c * y
- tm.f = -tm.b * x
+ tm.A = 1
+ tm.B = math.Tan(angleY * math.Pi / 180)
+ tm.C = math.Tan(angleX * math.Pi / 180)
+ tm.D = 1
+ tm.E = -tm.C * y
+ tm.F = -tm.B * x
f.Transform(tm)
}
@@ -161,7 +162,8 @@ func (f *Fpdf) TransformSkew(angleX, angleY, x, y float64) {
// TransformRotate() and TransformMirrorVertical() instead.
func (f *Fpdf) Transform(tm TransformMatrix) {
if f.transformNest > 0 {
- f.outf("%.3f %.3f %.3f %.3f %.3f %.3f cm", tm.a, tm.b, tm.c, tm.d, tm.e, tm.f)
+ f.outf("%.3f %.3f %.3f %.3f %.3f %.3f cm",
+ tm.A, tm.B, tm.C, tm.D, tm.E, tm.F)
} else if f.err == nil {
f.err = fmt.Errorf("Transformation context is not active")
}