BCB下用Canvas画直线、圆，椭圆，不规则多边形-Canvas painting BCB using a straight line, round, oval, irregular polygon, etc.

I wrote this program for my study. It demonstrates working with mathematical graphs and matrixes. It also draws result on canvas and supports editing. Sorry for my english.

基于BCB6开发，程序获取鼠标的当前位置，在画布中画图-Being based BCB6 mouse development, the current position of the program, drawing on the canvas