Research And Implementation Of Graphics Drawing And Undoing Based On Bitmap Format

At present,the interactive electronic blackboard has achieved some drawing and cancellation of graphics in teaching,after research found,these graphics formats are based on vector graphics,vector graphics is an object-oriented graphics drawing,drawing graphics according to geometric characteristics.The advantages of object-oriented vector graphics are small files,editable image element objects,the image will not be distorted after zooming in and out,and resolution irrelevant.However,object-oriented vector graphics have their own shortcomings,and they cannot accurately describe the position of the graphics,such as it is difficult to draw mathematical images such as a concentric circle and so on.It is not advisable to do complex combined images,and precise erasure cannot be achieved.Classroom teaching adopts a one-to-many teaching mode,which is based on vector graphics format drawing and revocation.It is difficult to operate in a specific occasion such as teaching,which does not conform to the drawing habits of teachers and other personnel.Therefore,a new type of drawing method needs to be studied,which is suitable for classroom teaching.The drawing and cancellation of bitmap format graphics will become a hot research topic in the future.The research on the electronic writing system based on bitmap format graphics drawing and revocation needs to truly solve the problems caused by the vector graphics format,and it is really convenient for teachers and other personnel to work in specific situations in classroom teaching.The research focus of this article will be to use the bitmap format to draw and cancel graphics,and successfully used in the intelligent electronic blackboard.Compared with vector-based drawing programs,when processing bitmap images,bitmaps can optimize small details,make significant changes,and enhance the effect.Provides convenience for teachers' teaching.Realize the drawing function in the bitmap format on the intelligent electronic blackboard,which is different from the drawing in the vector format,vectorgraphics are object-like drawing methods,while bitmaps are non-object-like drawing methods.The basic graphics that can be drawn are similar to the graphics in the drawing tool under the Windows operating system.It can realize straight lines,curves,and closed graphics(Circle,rectangle),parabola,three-dimensional graphics and other graphics drawing,as well as the function of erasing and selection of drawing styles.In addition,the cancellation of graphics in bitmap format on intelligent electronic blackboards is a function that existing drawing tools and electronic blackboards do not have.This study has also been improved on the basis of the shortcomings of bitmaps.Using real-time drawing techniques and methods,down,move,and up methods are used to obtain the coordinates of each point in real time.It effectively avoids the shortcomings that the bitmap changes the size of the picture and distort the picture,and is successfully used on the intelligent electronic blackboard.This article first explains the related technologies used in system implementation,introduces the use of related algorithms in system development and the principles of bitmaps,expounds the design principles,goals,system structure,and operating procedures of the system's functional design.Design ideas and implementation methods,and finally successfully achieved drawing and cancellation based on bitmap format on the intelligent electronic blackboard.