摘? 要: GeoGebra是一款動態(tài)的二維幾何代數(shù)繪圖軟件,適合幾何代數(shù)微積分概率統(tǒng)計等數(shù)學(xué)教學(xué)演示,簡單易學(xué),非常受廣大數(shù)學(xué)老師喜愛,但是要想在GeoGebra中畫出漂亮的三維動態(tài)圖形,還需努力鉆研一些時間才能達(dá)到目的,為節(jié)省各位數(shù)學(xué)老師的學(xué)習(xí)時間,文中給出了GeoGebra二維環(huán)境畫三維動態(tài)圖形的關(guān)鍵技術(shù),用數(shù)學(xué)的方法給出了二維坐標(biāo)變換為三維坐標(biāo)的原理,同時文中利用這一技術(shù)繪制了各種漂亮炫酷的動態(tài)空間旋轉(zhuǎn)圖形。
關(guān)鍵詞: GeoGebra;二維空間變換三維空間;三維動態(tài)旋轉(zhuǎn)圖形;信息化教學(xué)
【Abstract】: GeoGebra is a dynamic two-dimensional geometric algebraic drawing software. It is suitable for mathematical teaching demonstration such as probability and statistics of geometric algebraic calculus. It is easy to learn and very popular with mathematics teachers. However, if you want to draw beautiful three-dimensional dynamic graphics in GeoGebra, you need to study hard for some time to achieve the goal. In order to save the learning time of mathematics teachers, GeoGebra the principle of transforming two-dimensional coordinates of three-dimensional dynamic graphics into three-dimensional coordinates in two-dimensional environment drawing is introduced to rea ders. Meanwhile, various beautiful and cool dynamic spatial rotation graphics are drawn by using this technology.
【Key words】: GeoGebra; Two-dimensional space transform three-dimensional space; 3-D dynamic rotating graphics; Information-based teaching
0? 引言
GeoGebra是一款動態(tài)的二維幾何代數(shù)繪圖軟件,適合幾何代數(shù)微積分概率統(tǒng)計等數(shù)學(xué)教學(xué)演示,簡單易學(xué),非常受廣大數(shù)學(xué)老師喜愛,但是要想在GeoGebra中畫出漂亮的三維動態(tài)圖形,還不是一件容易的事情,下面給出在GeoGebra中繪制三維圖形的方法[5-6]。
1? 構(gòu)建三維坐標(biāo)架
GeoGebra 是一個集幾何、代數(shù)與微積分于一體的動態(tài)數(shù)學(xué)軟件,由美國佛羅里達(dá)州亞特蘭大學(xué)的數(shù)學(xué)教授Markus Hohenwarter設(shè)計。GeoGebra可以畫點、向量、線段、直線、多邊形、圓錐曲線,函數(shù)圖像,可以處理變數(shù)(這些變數(shù)可以是一個數(shù)字、角度、向量或點坐標(biāo)),可以對函數(shù)作微分與積分,求方程的根,計算函數(shù)的極大極小值,還可以計算矩陣,概率統(tǒng)計等[7-8]。
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