Merge pull request #94 from naitoh/support_example_030

Colour gradients support

example/rails/app/controllers/example030_controller.rb

@@ -0,0 +1,180 @@
+# coding: UTF-8
+#============================================================+
+# Begin       : 2008-06-09
+# Last Update : 2010-05-20
+#
+# Description : Example 030 for RBPDF class
+#               Colour gradients
+#
+# Author: Jun NAITOH
+# License: LGPL 2.1 or later
+#============================================================+
+
+require("example_common.rb")
+
+class Example030Controller < ApplicationController
+  def index
+    # create new PDF document
+    pdf = RBPDF.new(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false)
+
+    # set document information
+    pdf.set_creator(PDF_CREATOR)
+    pdf.set_author(PDF_AUTHOR)
+    pdf.set_title('RBPDF Example 030')
+    pdf.set_subject('RBPDF Tutorial')
+    pdf.set_keywords('RBPDF, PDF, example, test, guide')
+
+    # set default header data
+    pdf.set_header_data(PDF_HEADER_LOGO, PDF_HEADER_LOGO_WIDTH, PDF_HEADER_TITLE + ' 030', PDF_HEADER_STRING)
+
+    # set header and footer fonts
+    pdf.set_header_font([PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN])
+    pdf.set_footer_font([PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA])
+
+    # set default monospaced font
+    pdf.set_default_monospaced_font(PDF_FONT_MONOSPACED)
+
+    # set margins
+    pdf.set_margins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT)
+    pdf.set_header_margin(PDF_MARGIN_HEADER)
+    pdf.set_footer_margin(PDF_MARGIN_FOOTER)
+
+    # set auto page breaks
+    pdf.set_auto_page_break(true, PDF_MARGIN_BOTTOM)
+
+    # set image scale factor
+    pdf.set_image_scale(PDF_IMAGE_SCALE_RATIO)
+
+    # set some language-dependent strings
+    pdf.set_language_array($l)
+
+    # ---------------------------------------------------------
+    # set font
+    pdf.set_font('helvetica', 'B', 20)
+    # --- first page ------------------------------------------
+    # add a page
+    pdf.add_page()
+
+    pdf.cell(0, 0, 'RBPDF Gradients', 0, 1, 'C', 0, '', 0, false, 'T', 'M')
+
+    # set colors for gradients (r,g,b) or (grey 0-255)
+    red = [255, 0, 0]
+    blue = [0, 0, 200]
+    yellow = [255, 255, 0]
+    green = [0, 255, 0]
+    white = [255]
+    black = [0]
+
+    # set the coordinates x1,y1,x2,y2 of the gradient (see linear_gradient_coords.jpg)
+    coords = [0, 0, 1, 0]
+
+    # paint a linear gradient
+    pdf.linear_gradient(20, 45, 80, 80, red, blue, coords)
+
+    # write label
+    pdf.text(20, 130, 'LinearGradient()')
+
+    # set the coordinates fx,fy,cx,cy,r of the gradient (see radial_gradient_coords.jpg)
+    coords = [0.5, 0.5, 1, 1, 1.2]
+
+    # paint a radial gradient
+    pdf.radial_gradient(110, 45, 80, 80, white, black, coords)
+
+    # write label
+    pdf.text(110, 130, 'RadialGradient()')
+
+    # paint a coons patch mesh with default coordinates
+    pdf.coons_patch_mesh(20, 155, 80, 80, yellow, blue, green, red)
+
+    # write label
+    pdf.text(20, 240, 'CoonsPatchMesh()')
+
+    # set the coordinates for the cubic B�zier points x1,y1 ... x12, y12 of the patch (see coons_patch_mesh_coords.jpg)
+    coords = [
+      0.00, 0.00, 0.33, 0.20,             # lower left
+      0.67, 0.00, 1.00, 0.00, 0.80, 0.33, # lower right
+      0.80, 0.67, 1.00, 1.00, 0.67, 0.80, # upper right
+      0.33, 1.00, 0.00, 1.00, 0.20, 0.67, # upper left
+      0.00, 0.33]                         # lower left
+    coords_min = 0 # minimum value of the coordinates
+    coords_max = 1 # maximum value of the coordinates
+
+    # paint a coons patch gradient with the above coordinates
+    pdf.coons_patch_mesh(110, 155, 80, 80, yellow, blue, green, red, coords, coords_min, coords_max)
+
+    # write label
+    pdf.text(110, 240, 'CoonsPatchMesh()')
+
+    # --- second page -----------------------------------------
+    pdf.add_page()
+
+    # first patch: f = 0
+    patch_array = []
+    patch_array[0] = {}
+    patch_array[0]['f'] = 0
+    patch_array[0]['points'] = [
+      0.00,0.00, 0.33,0.00,
+      0.67,0.00, 1.00,0.00, 1.00,0.33,
+      0.8,0.67, 1.00,1.00, 0.67,0.8,
+      0.33,1.80, 0.00,1.00, 0.00,0.67,
+      0.00,0.33]
+    patch_array[0]['colors'] = []
+    patch_array[0]['colors'][0] = {'r' => 255, 'g' => 255, 'b' => 0}
+    patch_array[0]['colors'][1] = {'r' => 0, 'g' => 0, 'b' => 255}
+    patch_array[0]['colors'][2] = {'r' => 0, 'g' => 255,'b' => 0}
+    patch_array[0]['colors'][3] = {'r' => 255, 'g' => 0,'b' => 0}
+
+    # second patch - above the other: f = 2
+    patch_array[1] = {}
+    patch_array[1]['f'] = 2
+    patch_array[1]['points'] = [
+      0.00,1.33,
+      0.00,1.67, 0.00,2.00, 0.33,2.00,
+      0.67,2.00, 1.00,2.00, 1.00,1.67,
+      1.5,1.33]
+    patch_array[1]['colors'] = []
+    patch_array[1]['colors'][0] = {'r' => 0, 'g' => 0, 'b' => 0}
+    patch_array[1]['colors'][1] = {'r' => 255, 'g' => 0, 'b' => 255}
+
+    # third patch - right of the above: f = 3
+    patch_array[2] = {}
+    patch_array[2]['f'] = 3
+    patch_array[2]['points'] = [
+      1.33,0.80,
+      1.67,1.50, 2.00,1.00, 2.00,1.33,
+      2.00,1.67, 2.00,2.00, 1.67,2.00,
+      1.33,2.00]
+    patch_array[2]['colors'] = []
+    patch_array[2]['colors'][0] = {'r' => 0, 'g' => 255, 'b' => 255}
+    patch_array[2]['colors'][1] = {'r' => 0, 'g' => 0, 'b' => 0}
+
+    # fourth patch - below the above, which means left(?) of the above: f = 1
+    patch_array[3] = {}
+    patch_array[3]['f'] = 1
+    patch_array[3]['points'] = [
+      2.00,0.67,
+      2.00,0.33, 2.00,0.00, 1.67,0.00,
+      1.33,0.00, 1.00,0.00, 1.00,0.33,
+      0.8,0.67]
+    patch_array[3]['colors'] = []
+    patch_array[3]['colors'][0] = {'r' => 0, 'g' => 0, 'b' => 0}
+    patch_array[3]['colors'][1] = {'r' => 0, 'g' => 0, 'b' => 255}
+
+    coords_min = 0
+    coords_max = 2
+
+    pdf.coons_patch_mesh(10, 45, 190, 200, '', '', '', '', patch_array, coords_min, coords_max)
+
+    # write label
+    pdf.text(10, 250, 'CoonsPatchMesh()')
+
+    # ---------------------------------------------------------
+
+    # Close and output PDF document
+    send_data pdf.output(), :type => "application/pdf", :disposition => "inline"
+  end
+end
+
+#============================================================+
+# END OF FILE
+#============================================================+