CHA P TE R 6 in Java

Paint USS Code 39 in Java CHA P TE R 6
CHA P TE R 6
Code 3/9 Generation In Java
Using Barcode creator for Java Control to generate, create Code 39 Extended image in Java applications.
Rendering
Draw Barcode In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
The following sections describe the scan conversion algorithms that are typical of Adobe Acrobat products (These details also apply to Adobe PostScript products, yielding consistent results when a viewer application prints a document on a PostScript printer) Most scan conversion details are not under program control, but a few are; the parameters for controlling them are described here
Barcode Recognizer In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
651 Flatness Tolerance
Code 3 Of 9 Generation In C#
Using Barcode generator for Visual Studio .NET Control to generate, create Code-39 image in VS .NET applications.
The atness tolerance controls the maximum permitted distance in device pixels between the mathematically correct path and an approximation constructed from straight line segments, as shown in Figure 66 Flatness can be speci ed as the operand of the i operator (see Table 47 on page 156) or as the value of the FL entry in a graphics state parameter dictionary (see Table 48 on page 157) It must be a positive number; smaller values yield greater precision at the cost of more computation Note: Although the gure exaggerates the difference between the curved and attened paths for the sake of clarity, the purpose of the atness tolerance is to control the precision of curve rendering, not to draw inscribed polygons If the parameter s value is large enough to cause visible straight line segments to appear, the result is unpredictable
USS Code 39 Creator In .NET
Using Barcode generator for ASP.NET Control to generate, create Code39 image in ASP.NET applications.
Flatness error tolerance
Code 3 Of 9 Creator In VS .NET
Using Barcode creator for .NET Control to generate, create Code 39 Full ASCII image in .NET framework applications.
FIGURE 66 Flatness tolerance
Encode Code 3/9 In VB.NET
Using Barcode creator for Visual Studio .NET Control to generate, create Code 39 Extended image in Visual Studio .NET applications.
S E CTIO N 6 5
European Article Number 13 Drawer In Java
Using Barcode drawer for Java Control to generate, create European Article Number 13 image in Java applications.
Scan Conversion Details
EAN128 Maker In Java
Using Barcode creator for Java Control to generate, create UCC-128 image in Java applications.
652 Smoothness Tolerance
Universal Product Code Version A Generator In Java
Using Barcode encoder for Java Control to generate, create UPC-A Supplement 5 image in Java applications.
The smoothness tolerance (PDF 13) controls the quality of smooth shading (type 2 patterns and the sh operator), and thus indirectly controls the rendering performance Smoothness is the allowable color error between a shading approximated by piecewise linear interpolation and the true value of a (possibly nonlinear) shading function The error is measured for each color component, and the maximum error is used The allowable error (or tolerance) is expressed as a fraction of the range of the color component, from 00 to 10 Thus, a smoothness tolerance of 01 represents a tolerance of 10 percent in each color component Smoothness can be speci ed as the value of the SM entry in a graphics state parameter dictionary (see Table 48 on page 157) Each output device may have internal limits on the maximum and minimum tolerances attainable For example, setting smoothness to 10 may result in an internal smoothness of 05 on a high-quality color device, while setting it to 00 on the same device may result in an internal smoothness of 001 if an error of that magnitude is imperceptible on the device The smoothness tolerance may also interact with the accuracy of color conversion In the case of a color conversion de ned by a sampled function, the conversion function is unknown Thus the error may be sampled at too low a frequency, in which case the accuracy de ned by the smoothness tolerance cannot be guaranteed In most cases, however, where the conversion function is smooth and continuous, the accuracy should be within the speci ed tolerance The effect of the smoothness tolerance is similar to that of the atness tolerance Note, however, that atness is measured in device-dependent units of pixel width, whereas smoothness is measured as a fraction of color component range
Data Matrix Encoder In Java
Using Barcode generator for Java Control to generate, create Data Matrix image in Java applications.
653 Scan Conversion Rules
Barcode Generation In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
The following rules determine which device pixels a painting operation will affect All references to coordinates and pixels are in device space A shape is a path to be painted with the current color or with an image Its coordinates are mapped into device space, but not rounded to device pixel boundaries At this level, curves have been attened to sequences of straight lines, and all insideness computations have been performed
MSI Plessey Printer In Java
Using Barcode encoder for Java Control to generate, create MSI Plessey image in Java applications.
CHA P TE R 6
Paint Data Matrix In Visual C#.NET
Using Barcode generation for .NET Control to generate, create DataMatrix image in Visual Studio .NET applications.
Rendering
Code 39 Creator In .NET Framework
Using Barcode generation for ASP.NET Control to generate, create Code 39 Extended image in ASP.NET applications.
Pixel boundaries always fall on integer coordinates in device space A pixel is a square region identi ed by the location of its corner with minimum horizontal and vertical coordinates The region is half-open, meaning that it includes its lower but not its upper boundaries More precisely, for any point whose realnumber coordinates are (x, y), let i = oor(x) and j = oor(y) The pixel that contains this point is the one identi ed as (i, j) The region belonging to that pixel is de ned to be the set of points (x , y ) such that i x < i + 1 and j y < j + 1 Like pixels, shapes to be painted by lling and stroking operations are also treated as half-open regions that include the boundaries along their oor sides, but not along their ceiling sides A shape is scan-converted by painting any pixel whose square region intersects the shape, no matter how small the intersection is This ensures that no shape ever disappears as a result of unfavorable placement relative to the device pixel grid, as might happen with other possible scan conversion rules The area covered by painted pixels is always at least as large as the area of the original shape This rule applies both to ll operations and to strokes with nonzero width Zero-width strokes are done in a device-dependent manner that may include fewer pixels than the rule implies Note: Normally, the intersection of two regions is de ned as the intersection of their interiors However, for purposes of scan conversion, a lling region is considered to intersect every pixel through which its boundary passes, even if the interior of the lling region is empty Thus, for example, a zero-width or zero-height rectangle will paint a line 1 pixel wide The region of device space to be painted by a sampled image is determined similarly to that of a lled shape, though not identically The viewer application transforms the image s source rectangle into device space and de nes a half-open region, just as for ll operations However, only those pixels whose centers lie within the region are painted The position of the center of such a pixel in other words, the point whose coordinate values have fractional parts of one-half is mapped back into source space to determine how to color the pixel There is no averaging over the pixel area; if the resolution of the source image is higher than that of device space, some source samples will not be used For clipping, the clipping region consists of the set of pixels that would be included by a ll operation Subsequent painting operations affect a region that is the intersection of the set of pixels de ned by the clipping region with the set of pixels for the region to be painted
Painting Bar Code In .NET
Using Barcode encoder for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Bar Code Encoder In .NET Framework
Using Barcode generation for Visual Studio .NET Control to generate, create barcode image in VS .NET applications.
Bar Code Generator In VS .NET
Using Barcode encoder for .NET Control to generate, create bar code image in Visual Studio .NET applications.