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CHAPTER 7 DRAWING AND PRINTING
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Note Although it is fairly easy to draw text using the drawText method, you might want to use the
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QTextDocument class to draw more complex texts. This class enables you to draw complex documents
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with various formatting and alignments in a straightforward way.
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Paths
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Painter paths make it possible to draw any shape you want, but the trick is to define a path surrounding a region. You can then stroke the path with a given pen and brush. A path can contain several closed regions; for instance, it is possible to represent an entire text string using a path. The path shown in Figure 7-14 is created in three steps. First, the QPainterPath object is created and the circle is added using the addEllipse method. This ellipse forms one closed region. QPainterPath path; path.addEllipse( 80, 80, 80, 80 );
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Figure 7-14. A path has been filled. The next step is to add the quarter circle originating from the center of the full circle and stretching to the top and left. It is started at (100, 100), and you move to that point using a moveTo call. Then you draw a line straight up using lineTo before drawing an arc using addArc. The arc is drawn in a rectangle starting at (40, 40); that is, 160 pixels high and wide. It starts at 90 degrees and spans another 90 degrees counterclockwise. The region is then closed with a line that returns to the starting point. This forms another closed region.
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Note The arc starts at 90 degrees because 0 degrees is considered to be the point to the right of the
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center point and you want it to start right above the center.
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path.moveTo( 120, 120 ); path.lineTo( 120, 40 ); path.arcTo( 40, 40, 160, 160, 90, 90 ); path.lineTo( 120, 120 );
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CHAPTER 7 DRAWING AND PRINTING
The last part to add is the text below the shapes. This is done by setting up a large font and then using it in a call to addText. The addText works like drawText but allows the text to start only from a given point (that is, no texts contained in rectangles). This forms a whole bunch of closed regions that form the text: QFont font = QApplication::font(); font.setPixelSize( 40 ); path.addText( 20, 180, font, "Path" ); When the painter path is complete, all that s left to do is stroke it with a painter. In the following code, you configure a pen and a brush for a painter. Then the drawPath method is used to draw the actual painter path. Figure 7-14 shows that when the regions overlap, the brush is not applied. This makes it possible to create hollow paths by putting other paths inside them. painter.setPen( Qt::black ); painter.setBrush( Qt::gray ); painter.drawPath( path ); Paths can consist of more shapes than the ones used in the preceding source code. The following list mentions some of the methods that you can use to add shapes to your path: addEllipse: Adds an ellipse or circle. addRect: Adds a rectangle. addText: Adds text. addPolygon: Adds a polygon. When building a region from lines, arcs, and other components, the following methods can be useful: moveTo: Moves the current position. lineTo: Draws a line to the next position. arcTo: Draws an arc to the next position. cubicTo: Draws a cubic Bezier curve (a smooth line) to the next point. closeSubpath: Closes the current region by drawing a straight line from the current position to the starting point. Paths can be very useful for representing shapes that you need to draw over and over again, but their true potential is shown when they are combined with brushes (discussed next).
CHAPTER 7 DRAWING AND PRINTING
Brushes
Brushes are used to fill shapes and paths. Until now you used brushes to fill the designated areas using solid colors. This is only a part of what is possible. Using different patterns, gradients, or even textures, you can fill your shapes in any conceivable way. When you create a QBrush object, you can specify a color and a style. The constructor is defined as QBrush(QColor, Qt::BrushStyle). The QBrush is then given to a QPainter using the setBrush method. The style of the brush controls how the color is used when filling shapes. The simplest styles are patterns, which are used when you need to fill a shape with lines or a dithered shade. The available patterns and corresponding enumerated styles are shown in Figure 7-15.
Figure 7-15. The available patterns A more flexible way to fill shapes is to use gradient brushes, which are brushes based on a QGradient object. A gradient object represents a blend between one or more colors according to a predefined pattern. The available patterns are shown in Figure 7-16. The linear gradient, which is based on the QLinearGradient class, defines a two-dimensional linear gradient. The radial gradient is implemented through QRadialGradient and describes a gradient emanating from a single point where the shade depends on the distance from the point. The conical gradient, QConicalGradient, represents a gradient emanating from a single point where the shade depends on the angle from the point. The different gradients are defined as a spread between two points (except for conical gradients, which start and stop at an angle). The way the gradient is continued outside the range defined by those points is defined by the spread policy, which is set with the setSpread method. The results from the different spread policies are also shown in Figure 7-16. With pad spread (QGradient::PadSpread) the gradient simply stops when the pads have been reached. With repeat spread (QGradient::RepeatSpread) the gradient is repeated. With reflected spread (QGradient::ReflectSpread) the gradient is repeated, but the direction is alternated causing the gradient to be reflected every other time.
Note The spread policy does not affect the conical gradients because they define the color of all pixels.
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