vb.net read usb barcode scanner VECTOR GRAPHICS ROBOT in Software

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VECTOR GRAPHICS ROBOT
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FIGURE 10.1
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The robot can draw.
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//---Pen test rLocate 300,300,90 rInvisible Magenta LineWidth 4 rPen Down for i = 1 to 4 rForward 100 rturn 90 next rPen Up rTurn 45 rForward 50 End
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//--Initialize the robot facing East //--magenta color for the pen //--line width of 4 is good here //--start drawing //--draw a square (4 sides)
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//--stop drawing //--move out of the way
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FIGURE 10.2
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Program using the pen to draw a square as shown above.
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Finally try changing both. You may have to change the initial position of the robot. Also experiment with making the numbers negative. 10.1.2 DRAWING RECTANGLES The program in Fig. 10.4 causes the robot to draw rectangles. Type it and observe the results. As in the previous section, there are two variables RectWidth and RectHeight that de ne the shape of the rectangle. Additionally, the initial position and heading of the robot determine the orientation of the rectangle. Experiment with changing these variables and observe the results.
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//---Draw Circles MainProgram: //---Change these values to change the position of the circle R_Init_X = 100 R_Init_Y = 300 R_Init_Heading = 0 rLocate R_Init_X,R_Init_Y,R_Init_Heading rInvisible Magenta LineWidth 4 //---Change these values to change the size of the circle fStep = 1 tStep = 1 gosub DrawCircle rTurn 90 //--move out of the way rForward 40 End //====================================================== DrawCircle: rPen Down //--start drawing for i = 1 to 360/tStep rForward fStep rturn tStep next rPen Up //--stop drawing Return //======================================================
FIGURE 10.3
Drawing circles.
10.1.3 DRAWING TRIANGLES So far we have not had to use much math to draw rectangles or circles. However, drawing triangles will require a little math. If you nd some of the math here to be too complex, do not worry. Do try to understand it, but more importantly you should understand the overall algorithm. The math details are not as important as the nal outcome. In Chap. 4 we introduced some of the math functions in RobotBASIC, and also introduced the concept of converting from angles in radians to angles in degrees. Review that information if necessary (Sec. 4.2, Chap. 4). To draw a triangle we need to know the angles and sides of the triangles. You can de ne a triangle by two sides and their included angle, or by all the angles, or by all the sides, or by two angles and a side, and so on. You can see where this is going. You need three parameters that can be any combination of sides and angles. This implies that there are eight possible combinations. The ultimate outcome though, is to be able to calculate the lengths of the three sides and the corresponding three angles. Once the lengths of the sides and angles are known the robot can draw a triangle by moving the length of the rst side, turning 180 minus the angle, then moving the length of the next side, turning again 180 minus the angle, and then nally moving the last length. The subroutine (Lines 21 28) in Fig. 10.5 shows this. Remember, line numbers are only for the purpose of reference during the coming discussion.
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//---Draw Rectangles MainProgram: //----change the to make the rectangle have se //----different orientation and position R_Init_X = 100 R_Init_Y = 300 R_Init_Heading = -45 rLocate R_Init_X,R_I nit_Y,R_Init_Heading rInvisible Ma genta LineWidth 4 //---change these variables to change size of the rectangle RectWidth = 100 RectHeight = 50 gosub DrawRectangle rTurn -45 //--m ove out of the way rForward 40 End //============= ========================================= DrawRectangle: rPen Down //--start drawing for I = 1 to 2 rturn 90 rForward RectWidth rTurn 90 rForward RectHei ght next rPen Up //--stop drawing Return //======================================================
FIGURE 10.4
Drawing rectangles.
02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
MainProgram: //----change these to make the triangle have //----different orientation and position R_Init_X = 400 R_Init_Y = 300 R_Init_Heading = -90 rLocate R_Init_X,R_InitY,R_Init_Heading _ rInvisible Magenta LineWidth 4 //---change these values Side = 150 Angle = 50 Data Sides; 2*Side*cos(Angle*pi(1)/180),Side,Side Data Angles;Angle,180-2*Angle,Angle gosub Draw Triangle rTurn -45 //--move out of the way rForward 40 End //====================================================== Draw Triangle: rPen Down //--start drawing For i = 1 to 3 rForward Sides[i-1] rTurn 180-Angles[i-1] next rPen Up //--stop drawing Return //======================================================
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