14 Hide all lines, circle d and segment a. 15 Hide labels of segments (Stylebar). 16 Set both sliders Columns and Rows to value 10. Create a list of vertical segments. 17 Sequence[Segment[A+i*(1, 0), C+i*(1, 0)],i ,1 ,Columns] Note: specifies a series of points starting at point A with A + i*(1, 0) distance 1 from each other. specifies a series of points starting at point C with C + i*(1, 0) distance 1 from each other. creates a list of Segment[A + i*(1, 0), C + i*(1, 0)] segments between pairs of these points. Note, that the endpoints of the segments are not shown in the Graphics View. Slider Column determines the number of segments created. Create a list of horizontal segments. 18 Sequence[Segment[A+i*(0, 1), B+i*(0, 1)], i, 1, Rows] 19 Move sliders Columns and Rows to check the construction. Insert static and dynamic text that state the multiplication problem using the values of sliders Columns and Rows as the factors: text1: Columns 20 text2: * text3: Rows text4: = Calculate the result of the multiplication: 21 result = Columns * Rows 22 Insert dynamic text5: result 23 Hide points A, B, C and D. 24 Enhance your construction using the Stylebar. Challenge of the Day: String Art Based on Bézier Curves Bézier curves are parametric curves used in computer graphics. For example, they are used in order to create smooth lines of vector fonts. create some Let’s based on Bézier curves. ‘string art’ Preparations Open a new GeoGebra window.
14 Hide all lines, circle d and segment a. 15 Hide labels of segments (Stylebar). 16 Set both sliders Columns and Rows to value 10. 17 Create a list of vertical segments. Sequence[Segment[A+i*(1, 0), C+i*(1, 0)],i ,1 ,Columns] Note: A + i*(1, 0) specifies a series of points starting at point A with distance 1 from each other. C + i*(1, 0) specifies a series of points starting at point C with distance 1 from each other. Segment[A + i*(1, 0), C + i*(1, 0)] creates a list of segments between pairs of these points. Note, that the endpoints of the segments are not shown in the Graphics View. Slider Column determines the number of segments created. 18 Create a list of horizontal segments. Sequence[Segment[A+i*(0, 1), B+i*(0, 1)], i, 1, Rows] 19 Move sliders Columns and Rows to check the construction. 20 Insert static and dynamic text that state the multiplication problem using the values of sliders Columns and Rows as the factors: text1: Columns text2: * text3: Rows text4: = 21 Calculate the result of the multiplication: result = Columns * Rows 22 Insert dynamic text5: result 23 Hide points A, B, C and D. 24 Enhance your construction using the Stylebar. Challenge of the Day: String Art Based on Bézier Curves Bézier curves are parametric curves used in computer graphics. For example, they are used in order to create smooth lines of vector fonts. Let’s create some ‘string art’ based on Bézier curves. Preparations Open a new GeoGebra window.
ggb-intro-en44-2014-07-17.docx