Differences

This shows you the differences between two versions of the page.

--- pdf:transformationexamples [2015/04/02 17:40]
christian
+++ pdf:transformationexamples [2015/04/02 18:12] (current)
christian [flip vertically]
@@ Line 3: / Line 3: @@
 By default, PDF uses a conventional graph coordinate system, with the origin in the lower left corner. These examples create a 200x200 page with the origin in the middle, a vertical line at x=0, a horizontal lines at y = 0 and text in each quadrant.
-The code is integrated as
-	PDF.Document demo10_transformationsNone.
-	PDF.Document demo10a_transformationsFlipVertically.
-	PDF.Document demo10b_transformationsFlipHorizontally.
-	PDF.Document demo10c_transformationsFlipDiagonal.
-	PDF.Document demo10d_transformationsFlipVerticallyTranslateOrigin.
 ===== no transformation =====
-	page := Graphics.PDF.Page
+<code smalltalk>
-		newInBounds: (-100 @ -100 corner: 100 @ 100)
+page := Graphics.PDF.Page
-		colorspace: DeviceRGB new
+  newInBounds: (-100 @ -100 corner: 100 @ 100)
-		render: [:renderer ¦
+  colorspace: DeviceRGB new
-			renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
+  render: [:renderer ¦
-			renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
+    renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
-			renderer textObjectDo: [
+    renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
-				renderer setFont: #Helvetica size: 1.
+    renderer textObjectDo: [
-				renderer textMatrix: #(4 0 0 4 50 50); showString: '(50 50)'.
+      renderer setFont: #Helvetica size: 1.
-				renderer textMatrix: #(2 0 0 2 -50 50); showString: '(-50 50)'.
+      renderer textMatrix: #(4 0 0 4 50 50); showString: '(50 50)'.
-				renderer textMatrix: #(2 0 0 2 50 -50); showString: '(50 -50)'.
+      renderer textMatrix: #(2 0 0 2 -50 50); showString: '(-50 50)'.
-				renderer textMatrix: #(2 0 0 2 -50 -50); showString: '(-50 -50)']].
+      renderer textMatrix: #(2 0 0 2 50 -50); showString: '(50 -50)'.
-	page saveAndShowAs: 'demo10_transformationsNone.pdf'
+      renderer textMatrix: #(2 0 0 2 -50 -50); showString: '(-50 -50)']].
+page saveAndShowAs: 'demo10_transformationsNone.pdf'
+</code>
+{{demo10_transformationsnone.pdf}}
 ===== flip vertically =====
-	"x -> x  ,  y -> -y
+<code smalltalk>
-	In this example the matrix is coded manually.
+"x -> x  ,  y -> -y
-		It can also be coded as 'Matrix scale: 4 @ -4' to get '[4 0 0 -4 0 0]'
+In this example the matrix is coded manually.
-		and '(Matrix scale: 4 @ -4) translate: 50 @ 50' to get '[4 0 0 -4 50 50]'"
+It can also be coded as Matrix scale: 4 @ -4 to get '[4 0 0 -4 0 0]'
-	page := Graphics.PDF.Page
+and (Matrix scale: 4 @ -4) translate: 50 @ 50 to get '[4 0 0 -4 50 50]'"
-		newInBounds: (-100 @ -100 corner: 100 @ 100)
-		colorspace: DeviceRGB new
+page := Graphics.PDF.Page
-		render: [:renderer ¦
+  newInBounds: (-100 @ -100 corner: 100 @ 100)
-				renderer concat: (Matrix scale: 1 @ -1).
+  colorspace: DeviceRGB new
-			renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
+  render: [:renderer ¦
-			renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
+    renderer concat: (Matrix scale: 1 @ -1).
-			renderer textObjectDo: [
+    renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
-				renderer setFont: #Helvetica size: 1.
+    renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
-				renderer textMatrix: #(4 0 0 -4 50 50); showString: '(50 50)'.
+    renderer textObjectDo: [
-				renderer textMatrix: #(2 0 0 -2 -50 50); showString: '(-50 50)'.
+      renderer setFont: #Helvetica size: 1.
-				renderer textMatrix: #(2 0 0 -2 50 -50); showString: '(50 -50)'.
+      renderer textMatrix: #(4 0 0 -4 50 50); showString: '(50 50)'.
-				renderer textMatrix: #(2 0 0 -2 -50 -50); showString: '(-50 -50)']].
+      renderer textMatrix: #(2 0 0 -2 -50 50); showString: '(-50 50)'.
-	page saveAndShowAs: 'demo10a_transformationsFlipVertically.pdf'
+      renderer textMatrix: #(2 0 0 -2 50 -50); showString: '(50 -50)'.
+      renderer textMatrix: #(2 0 0 -2 -50 -50); showString: '(-50 -50)']].
+page saveAndShowAs: 'demo10a_transformationsFlipVertically.pdf'
+</code>
+{{demo10a_transformationsflipvertically.pdf}}
 ===== flip horizontally =====
-	"x -> -x  ,  y -> y"
+<code smalltalk>
-	page := Graphics.PDF.Page
+"x -> -x  ,  y -> y"
-		newInBounds: (-100 @ -100 corner: 100 @ 100)
+page := Graphics.PDF.Page
-		colorspace: DeviceRGB new
+  newInBounds: (-100 @ -100 corner: 100 @ 100)
-		render: [:renderer ¦
+  colorspace: DeviceRGB new
-				renderer concat: (Matrix scale: -1 @ 1).
+  render: [:renderer ¦
-			renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
+    renderer concat: (Matrix scale: -1 @ 1).
-			renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
+    renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
-			renderer textObjectDo: [
+    renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
-				renderer setFont: #Helvetica size: 1.
+    renderer textObjectDo: [
-				renderer textMatrix: #(-4 0 0 4 50 50); showString: '(50 50)'.
+      renderer setFont: #Helvetica size: 1.
-				renderer textMatrix: #(-2 0 0 2 -50 50); showString: '(-50 50)'.
+      renderer textMatrix: #(-4 0 0 4 50 50); showString: '(50 50)'.
-				renderer textMatrix: #(-2 0 0 2 50 -50); showString: '(50 -50)'.
+      renderer textMatrix: #(-2 0 0 2 -50 50); showString: '(-50 50)'.
-				renderer textMatrix: #(-2 0 0 2 -50 -50); showString: '(-50 -50)']].
+      renderer textMatrix: #(-2 0 0 2 50 -50); showString: '(50 -50)'.
-	page saveAndShowAs: 'demo10b_transformationsFlipHorizontally.pdf'
+      renderer textMatrix: #(-2 0 0 2 -50 -50); showString: '(-50 -50)']].
+page saveAndShowAs: 'demo10b_transformationsFlipHorizontally.pdf'
+</code>
+{{demo10b_transformationsfliphorizontally.pdf}}
 ===== flip diagonally =====
-	"x -> -x  ,  y -> -y"
+<code smalltalk>
-	page := Graphics.PDF.Page
+"x -> -x  ,  y -> -y"
-		newInBounds: (-100 @ -100 corner: 100 @ 100)
+page := Graphics.PDF.Page
-		colorspace: DeviceRGB new
+  newInBounds: (-100 @ -100 corner: 100 @ 100)
-		render: [:renderer ¦
+  colorspace: DeviceRGB new
-				renderer concat: (Matrix scale: -1 @ -1).
+  render: [:renderer ¦
-			renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
+    renderer concat: (Matrix scale: -1 @ -1).
-			renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
+    renderer moveTo: -100 @ 0; lineTo: 100 @ 0; stroke.  "line at y = 0"
-			renderer textObjectDo: [
+    renderer moveTo: 0 @ -100; lineTo: 0 @ 100; stroke.  "line at x = 0"
-				renderer setFont: #Helvetica size: 1.
+    renderer textObjectDo: [
-				renderer textMatrix: #(-4 0 0 -4 50 50); showString: '(50 50)'.
+      renderer setFont: #Helvetica size: 1.
-				renderer textMatrix: #(-2 0 0 -2 -50 50); showString: '(-50 50)'.
+      renderer textMatrix: #(-4 0 0 -4 50 50); showString: '(50 50)'.
-				renderer textMatrix: #(-2 0 0 -2 50 -50); showString: '(50 -50)'.
+      renderer textMatrix: #(-2 0 0 -2 -50 50); showString: '(-50 50)'.
-				renderer textMatrix: #(-2 0 0 -2 -50 -50); showString: '(-50 -50)']].
+      renderer textMatrix: #(-2 0 0 -2 50 -50); showString: '(50 -50)'.
-	page saveAndShowAs: 'demo10c_transformationsFlipDiagonal.pdf'
+      renderer textMatrix: #(-2 0 0 -2 -50 -50); showString: '(-50 -50)']].
+page saveAndShowAs: 'demo10c_transformationsFlipDiagonal.pdf'
+</code>
+{{demo10c_transformationsflipdiagonal.pdf}}
 ===== flip vertically and located origin in upper left corner =====
-	"This is the more common layout used for reports"
+<code smalltalk>
-	page := Graphics.PDF.Page
+"This is the more common layout used for reports"
-		newInBounds: (0 @ 0 corner: 100 @ -100)
+page := Graphics.PDF.Page
-		colorspace: DeviceRGB new
+  newInBounds: (0 @ 0 corner: 100 @ -100)
-		render: [:renderer ¦
+  colorspace: DeviceRGB new
-				renderer concat: (Matrix scale: 1 @ -1).
+  render: [:renderer ¦
-			renderer textObjectDo: [
+    renderer concat: (Matrix scale: 1 @ -1).
-				renderer setFont: #Helvetica size: 1.
+    renderer textObjectDo: [
-				renderer textMatrix: #(2 0 0 -2 10 10); showString: '(10 10)'.
+      renderer setFont: #Helvetica size: 1.
-				renderer textMatrix: #(2 0 0 -2 10 20); showString: '(10 20)'.
+      renderer textMatrix: #(2 0 0 -2 10 10); showString: '(10 10)'.
-				renderer textMatrix: #(2 0 0 -2 10 30); showString: '(10 30)'.
+      renderer textMatrix: #(2 0 0 -2 10 20); showString: '(10 20)'.
-				renderer textMatrix: #(2 0 0 -2 10 40); showString: '(10 40)'.
+      renderer textMatrix: #(2 0 0 -2 10 30); showString: '(10 30)'.
-				renderer textMatrix: #(2 0 0 -2 20 10); showString: '(20 10)'.
+      renderer textMatrix: #(2 0 0 -2 10 40); showString: '(10 40)'.
-				renderer textMatrix: #(2 0 0 -2 20 20); showString: '(20 20)'.
+      renderer textMatrix: #(2 0 0 -2 20 10); showString: '(20 10)'.
-				renderer textMatrix: #(2 0 0 -2 20 30); showString: '(20 30)'.
+      renderer textMatrix: #(2 0 0 -2 20 20); showString: '(20 20)'.
-				renderer textMatrix: #(2 0 0 -2 20 40); showString: '(20 40)']].
+      renderer textMatrix: #(2 0 0 -2 20 30); showString: '(20 30)'.
-	page saveAndShowAs: 'demo10d_transformationsFlipVerticallyTranslateOrigin.pdf'
+      renderer textMatrix: #(2 0 0 -2 20 40); showString: '(20 40)']].
+page saveAndShowAs: 'demo10d_transformationsFlipVerticallyTranslateOrigin.pdf'
+</code>
+{{demo10d_transformationsflipverticallytranslateorigin.pdf}}

Christians Wiki

User Tools

Site Tools

Differences

Page Tools