Code Structure in .NET

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1.2.1 Code Structure
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The structure of Processing code is divided in two main sections: setup and draw. The setup section is used to define initial environment properties (e.g., screen size, background color, loading images or fonts, etc.) and the draw section for executing the drawing commands (e.g., point, line, ellipse, image, etc.) in a loop that can be used for animation. The structure of the code is:
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void setup(){ } void draw(){ }
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Elements of the Language
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The word void means that the procedure does not return any value back, that is, it returns void. The word setup() is the name of the default setup section, and the parentheses are there in case you need to insert parameters for processing; here they are empty, that is, (). The curly brackets { and } denote the beginning and end of the process and normally should include the commands to be executed.
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1.2.2 Draw Commands
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The draw() command contains almost all geometrical, type, and image commands with their corresponding attributes. The coordinate system of the screen (shown in Figure 1-1) is anchored on the upper-left corner with the x-axis extending horizontally from left to right, the y-axis extending vertically from top to bottom, and the z-axis (for 3D purposes) extending perpendicular to the screen towards the user.
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(0,0,0) (0,0) +x +x +z +y
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figure 1-1: A two- and three-dimensional coordinate system used by Processing
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1.2.3 Geometrical Objects
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The main geometrical objects are:
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point() makes a point (i.e., a dot). It takes two integer numbers to spec-
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ify the location s coordinates, starting from the upper-left corner. For example:
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point(20,30);
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will draw a point at the following location: 20 pixels right and 30 pixels below the upper left corner of the window, as shown in Figure 1-2.
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figure 1-2: A point
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line() draws a line segment between two points. It takes four integer numbers to specify the beginning and end point coordinates. For example,
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line(20,30,50,60);
will draw a line segment from point 20,30 to point 50,60 (shown in Figure 1-3).
figure 1-3: A line
line(20,30,20,50); line(10,40,30,40);
will draw a cross at location 20,40 (see Figure 1-4).
figure 1-4: Two lines in the form of a cross
rect() draws a rectangle. It takes as parameters four integers to specify
the x and y coordinates of the starting point and the width and height of the rectangle. For example:
rect(30,30,50,20);
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Elements of the Language
will draw a rectangle at location 30,30 (i.e., the coordinates of the rectangle s upper-left corner), as shown in Figure 1-5, with a width of 50 pixels and height of 20 pixels. If the command rectMode(CENTER) precedes the rect() command, then the first two coordinates (i.e., 30 and 30) refer to the center of the rectangle, not its upper-left corner.
figure 1-5: A rectangle
ellipse() draws an ellipse. It takes four integers to specify the center
point and the width and height. For example:
ellipse(30,30,50,20);
will draw an ellipse (shown in Figure 1-6) at location 30,30 (center point) with a width of 50 pixels and height of 20 pixels (also the dimensions of a bounding box to the ellipse).
figure 1-6: An ellipse
arc() draws an arc. It takes four integers to specify the center point and
the width and height of the bounding box and two float numbers to indicate the beginning and end angle in radians. For example,
arc(50,50,70,70,0,PI/2);
will draw an arc at location 50,50 (center point) with a width of 70 pixels and height of 70 pixels (bounding box) with an angle from 0 to p/2 degrees, as shown in Figure 1-7. Notice that angle is drawn in a clockwise direction.
figure 1-7: An arc
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The syntax of the parameters is arc(x,y,width,height,start,end).
curve() draws a curve between two points. It takes as parameters the
coordinates of the two points and their anchors. For example:
noFill(); curve(20,80,20,20,80,20,80,80); curve(20,20,80,20,80,80,20,80); curve(80,20,80,80,20,80,20,20);
will produce Figure 1-8.
figure 1-8: A curve
The syntax of the parameters is:
curve(first anchor x, first anchor y, first point x, first point y, second point x, second point y, second anchor x, second anchor y)
bezier() draws a Bezier curve between two points, as shown in Figure 1-9. It takes as parameters the coordinates of the two points and their anchors. For example:
noFill(); bezier(20,80,20,20,80,20,80,80);
figure 1-9: A Bezier curve
The syntax of the parameters is:
bezier(first anchor x,first anchor y,first point x,first point y, second point x,second point y,second anchor x,second anchor y)
vertex() produces a series of vertices connected through lines. It requires a beginShape() and an endShape() command to indicate the beginning
and end of the vertices. For example, the number patterns shown earlier in this chapter can be visualized through simple algorithms. In that sense, the following code will produce a pattern of points shown in Figure 1-10.