Context Free Art – Tutorial 9

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These exercises take a closer look at the colour information, hue, saturation and brightness.

startshape Bryan

path Line {
	MOVETO {x 0 y -9}
	LINETO {x 0 y 9}
	STROKE {sat 1 b 1}
}

rule Bryan {
	360 * {x 0.05 h 1} Line {}
}
Hue information
startshape Bryan

path Line {
	MOVETO {x 0 y -9}
	LINETO {x 0 y 9}
	STROKE {h 200 sat 0 b 1}
}

rule Bryan {
	400 * {x 0.05 sat 0.003} Line {}
}
Saturation information

startshape Bryan

path Line {
	MOVETO {x 0 y -9}
	LINETO {x 0 y 9}
	STROKE {h 0 sat 1 b 0}
}

rule Bryan {
	400 * {x 0.05 b 0.003} Line {}
}
Brightness information
startshape MyShape

rule MyLine {
	TRIANGLE {s 0.016 1 sat 1 b 1}
}

rule MyShape {
	360 * {r 1 h 1} MyLine {y -0.60}
}
Colour wheel
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Context Free Art – Tutorial 8

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By using the same square, we further experiment with the various options in the STROKE command.

STROKE {p miterjoin}

STROKE {p roundjoin}

STROKE {p beveljoin}
Different uses of join

startshape MyShape

path Shape1 {
	MOVETO {x -0.5 y -0.5}
	LINETO {x 0.5 y -0.5}
	LINETO {x 0.5 y 0.5}
	STROKE {p buttcap}
}

path Shape2 {
	MOVETO {x -0.5 y -0.5}
	LINETO {x 0.5 y -0.5}
	LINETO {x 0.5 y 0.5}
	STROKE {p roundcap}
}

path Shape3 {
	MOVETO {x -0.5 y -0.5}
	LINETO {x 0.5 y -0.5}
	LINETO {x 0.5 y 0.5}
	STROKE {p squarecap}
}

rule MyShape {
	Shape1 {x -1.5}
	Shape2 {x 0}
	Shape3 {x 1.5}
}
Different uses of cap
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Context Free Art – Tutorial 7

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We continue the study of path command. Take a look of the closed shape, a square.

startshape MyShape

path Line {
	MOVETO {x -0.5 y -0.5}
	LINETO {x 0.5 y -0.5}
	LINETO {x 0.5 y 0.5}
	LINETO {x -0.5 y 0.5}
	LINETO {x -0.5 y -0.5}
	CLOSEPOLY {}
	STROKE {}
}

rule MyShape {
	Line {}
}
CLOSEPOLY

If by any chances, you type the wrong position for the last end point or there is rounding error after a sequence of calculation, you may end of with:

startshape MyShape

path Line {
	MOVETO {x -0.5 y -0.5}
	LINETO {x 0.5 y -0.5}
	LINETO {x 0.5 y 0.5}
	LINETO {x -0.5 y 0.5}
	LINETO {x -0.45 y -0.45}
	CLOSEPOLY {}
	STROKE {}
}

rule MyShape {
	Line {}
}
CLOSEPOLY error

Note the CLOSEPOLY command will connect an extra line segment to close the shape if there is a gap between the beginning and the end points iso win 10en. In case we want to get rid of the error, we can use the CLOSEPOLY command with an extra parameter align.

startshape MyShape

path Line {
	MOVETO {x -0.5 y -0.5}
	LINETO {x 0.5 y -0.5}
	LINETO {x 0.5 y 0.5}
	LINETO {x -0.5 y 0.5}
	LINETO {x -0.45 y -0.45}
	CLOSEPOLY {p align}
	STROKE {}
}

rule MyShape {
	Line {}
}
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OpenCV C++ usage

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I start using the C++ interface for OpenCV, instead of the old highgui C functions. Here is an example to do real time video capture from the default webcam itunes titel erneut downloaden.

#include "stdafx.h"
#include "cv.h"
#include "highgui.h"

using namespace cv;

int main(int, char**)
{
	VideoCapture cap(0);
	cap.set(CV_CAP_PROP_FRAME_WIDTH, 640);
	cap.set(CV_CAP_PROP_FRAME_HEIGHT, 480);
	if (!cap.isOpened())
		return -1;

	namedWindow("camera",CV_WINDOW_AUTOSIZE);
	while (true)
	{
		Mat frame;
		cap >> frame;
		imshow("camera", frame);
		if (waitKey(10) >= 0)
			break;
	}
	return 0;
}
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Context Free Art – Tutorial 6

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Today we start to think recursively. The following example uses a simple recursive definition of a SQUARE. In Context Free Art, we may not need to specify a stop condition when each iteration reduces its size, until eventually, the shape is too small to display stern tv videosen.

startshape Shape1

rule Shape3 {
	SQUARE {a -0.9}
	Shape3 {s 0.9 r 7}
}

rule Shape2 {
	4 * {x 1} Shape3 {r 45}
}

rule Shape1 {
	4 * {y 1} Shape2 {}
}
Recursive pattern
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Context Free Art – Tutorial 4

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The following examples illustrate the use of repetition in Context Free Art.

startshape MyShape

path Line1 {
	MOVETO {x 0 y 0}
	LINETO {x 1 y 0}
	STROKE {width .01}
}

rule MyShape {
	36 * {r 10} Line1 {}
}
Repetition with rotation
startshape MyShape

path Line1 {
	MOVETO {x 0 y 0}
	LINETO {x 1 y 0}
	STROKE {width .01}
}

rule MyShape {
	36 * {r 10 x 0.03} Line1 {}
}
Repetition with rotation and displacement
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Context Free Art – Tutorial 3

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These exercises cover the use of path in a shape.

startshape MyShape

path Line1 {
	MOVETO {x 0 y 0}
	LINETO {x 1 y 1}
	STROKE {width .01}
}

rule MyShape {
	Line1 {}
}
Line
startshape MyShape

path Line1 {
	MOVETO {x 0 y 0}
	LINETO {x 1 y 1}
	LINETO {x 0 y 1}
	LINETO {x 1 y 0}
	LINETO {x 0 y 0}
	STROKE {width .01}
}

rule MyShape {
	Line1 {}
}
Multiple lines
startshape MyShape

path Line1 {
	MOVETO {x 0 y 0}
	LINETO {x 1 y 0}
	STROKE {width .01}
}

rule MyShape {
	Line1 {r 25}
}
Rotation adjustment
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