LCD12864绘图之KS0108(3)

12864（KS0108）之绘图篇（三）常用几何图形绘制函数收集整理：杨正富（KL YZX-JDBDZZY-YZF）//画水平线: x0、x1为起始点和终点的水平坐标，y为垂直坐标void draw_Hline(uchar x0,uchar x1,uchar y,uchar color){uchar bak; //数据互换的中间变量，if(x0>x1){bak=x1;x1=x0;x0=bak;} //若x0>X1, 交换数据,使x1为大值do{draw_point(x0,y,color); //从左到右逐点显示x0++; //x0自加1}while(x1>=x0); //直到x0=x1为止}//画竖直线函数: x为起始点和终点的水平坐标，y0、y1为垂直坐标void draw_Vline(uchar x,uchar y0,uchar y1,uchar color){uchar bak; //数据互换的中间变量if(y0>y1){bak=y1;y1=y0;y0=bak;} //若y0>y1, 交换数据,使y1为大值do{draw_point(x,y0,color); //从上到下逐点显示y0++; //y0自加1}while(y1>=y0); //直到y0=y1为止}//任意两点间画直线:x0、y0为起始点坐标，x1、y1为终点坐标void draw_Rline(uchar x0,uchar y0,uchar x1,uchar y1,uchar color){int dx; //直线x轴差值变量int dy; //直线y轴差值变量char dx_sym; //x轴增长方向，为-1时减值方向，为1时增值方向char dy_sym; //y轴增长方向，为-1时减值方向，为1时增值方向int dx_x2; //dx*2值变量，用于加快运算速度int dy_x2; //dy*2值变量，用于加快运算速度int di; //决策变量/****************************画垂直线******************************/if(x0==x1) //如果水平坐标相等，则为垂直线{if(y0>y1) //若起点大于终点{dx=y0;y0=y1;y1=dx;} //交换数据（即交换起点）for(dx=y0;dx<y1+1;dx++) //从y0到y1逐点画线{draw_point(x0,dx,color); //画点}}/****************************画水平线******************************/if(y0==y1) //如果垂直坐标相等，则为水平线{if(x0>x1) //若起点横坐标大于终点{dy=x0;x0=x1;x1=dy;} //交换数据（即交换起点）for(dy=x0;dy<x1+1;dy++) //从X0到X1逐点画线{draw_point(dy,y0,color); //画点}}/****************************画斜线******************************/dx=x1-x0; //求取两点之间的差值dy=y1-y0;if(dx>0){dx_sym=1;} //判断x轴方向：dx>0，设置dx_sym=1 else if(dx<0){dx_sym=-1;} //判断x轴方向：dx<0，设置dx_sym=-1 if(dy>0){dy_sym=1;} //判断y轴方向：dy>0，设置dy_sym=1 else if(dy<0){dy_sym=-1;} //判断y轴方向：dy<0，设置dy_sym=-1 dx=dx_sym*dx; //将dx、dy取绝对值dy=dy_sym*dy;dx_x2=dx*2; //计算2倍的dx及dy值dy_x2=dy*2;/*************使用Bresenham法进行画直线**************************/if(dx>=dy) //对于dx>=dy，则使用x轴为基准{di=dy_x2-dx;while(x0!=x1){draw_point(x0,y0,color);x0+=dx_sym;if(di<0){di+=dy_x2;} //计算出下一步的决策值else{di+=dy_x2-dx_x2;y0+=dy_sym;}}draw_point(x0,y0,color); //显示最后一点}else //对于dx<dy，则使用y轴为基准{di=dx_x2-dy;while(y0!=y1){draw_point(x0,y0,color);y0+=dy_sym;if(di<0){di+=dx_x2;}else{di+=dx_x2-dy_x2;x0+=dx_sym;}}draw_point(x0,y0,color); //显示最后一点}}//画矩形rect: 矩形起左上顶点(x0,y0);右下顶点(x1,y1)void draw_rect(int x0, int y0, int x1, int y1,uchar color){int i;if(x0>x1){i=x0;x0=x1;x1=i;}if(y0>y1){i=y0;y0=y1;y1=i;}for(i=x0;i<x1+1;i++){draw_point(i,y0,color);draw_point(i,y1,color);}for(i=y0;i<y1+1;i++){draw_point(x0,i,color);draw_point(x1,i,color);}}//画实心矩形: 矩形起左上顶点(x0,y0);右下顶点(x1,y1)void draw_rectfill(int x0, int y0, int x1, int y1,uchar color){int i,j;if(x0>x1){i=x0;x0=x1;x1=i;}if(y0>y1){i=y0;y0=y1;y1=i;}for(i=y0;i<y1+1;i++){for(j=x0;j<x1+1;j++)draw_point(j,i,color);}}//画正方形函数: x0、y0为正方形左上角坐标，with正方形边长void draw_square(uchar x0,uchar y0,uchar with,uchar color){if(with == 0)return;if((x0+with)>127)return; //横轴超出液晶边界if((y0+with)>63)return;draw_rect(x0,y0,x0+with,y0+with,color);}//画填充正方形函数: x0、y0为正方形左上角坐标，with正方形边长void draw_squarefill(uchar x0,uchar y0,uchar with,uchar color){if(with==0) return;if((x0+with)>127)return; //横轴超出液晶边界if((y0+with)> 63)return;draw_rectfill(x0,y0,x0+with,y0+with,color);}//画圆函数: 圆心坐标（x1,y1），半径rvoid draw_circle(int x1,int y1,uint r,uchar color){int x=0, y=r, d=1-r; //计算初始值while(x<=y){////////绘制点(x,y)及其在八分圆中的另外7个对称点draw_point(x1+x,y1+y,color);draw_point(x1+y,y1+x,color);draw_point(x1-y,y1+x,color);draw_point(x1-x,y1+y,color);draw_point(x1-x,y1-y,color);draw_point(x1-y,y1-x,color);draw_point(x1+y,y1-x,color);draw_point(x1+x,y1-y,color);if(d<0){d+=2*x+3;} //根据误差项d的判断,决定非最大位移方向上是走还是不走else{d+=2*(x-y)+5;y--;}x++;}}//画实心圆: 圆心坐标（x1,y1），半径rvoid draw_circlefill(int x1, int y1, uint r,uchar color){int x,y,d;x=0;y=r;d=1-r; // 计算初始值while(x<=y){// 绘制点(x,y)及其在八分圆中的另外7 个对称点draw_Rline(x1+x,y1+y,x1-x,y1+y,color);draw_Rline(x1+x,y1-y,x1-x,y1-y,color);draw_Rline(x1+y,y1+x,x1-y,y1+x,color);draw_Rline(x1+y,y1-x,x1-y,y1-x,color);if(d<0)d+=2*x+3; // 根据误差项d 的判断,决定非最大位移方向上是走还是不走else{ d+=2*(x-y)+5;y--;}x++;}}//画正椭圆函数: 给定椭圆的四个点的参数，//最左、最右点的x轴坐标值为x0、x1，最上、最下点的y轴坐标为y0、y1.void draw_ellipse(char x0, char x1, char y0, char y1,uchar color){char draw_x0, draw_y0; // 刽图点坐标变量char draw_x1, draw_y1;char draw_x2, draw_y2;char draw_x3, draw_y3;char xx, yy; // 画图控制变量char center_x, center_y; // 椭圆中心点坐标变量char radius_x, radius_y; // 椭圆的半径，x轴半径和y轴半径int radius_xx, radius_yy; // 半径乘平方值int radius_xx2, radius_yy2; // 半径乘平方值的两倍char di; // 定义决策变量//参数过滤if((x0==x1)||(y0==y1)) return;//计算出椭圆中心点坐标center_x=(x0+x1)>>1;center_y=(y0+y1)>>1;//计算出椭圆的半径，x轴半径和y轴半径if(x0>x1) radius_x=(x0-x1)>>1;else radius_x=(x1-x0)>>1;if(y0>y1) radius_y=(y0-y1)>>1;else radius_y=(y1-y0)>>1;//计算半径平方值radius_xx = radius_x * radius_x;radius_yy = radius_y * radius_y;//计算半径平方值乘2值radius_xx2 = radius_xx<<1;radius_yy2 = radius_yy<<1;//初始化画图变量xx = 0;yy = radius_y;di = radius_yy2 + radius_xx - radius_xx2*radius_y ; // 初始化决策变量//计算出椭圆y轴上的两个端点坐标，作为作图起点draw_x0 = draw_x1 = draw_x2 = draw_x3 = center_x;draw_y0 = draw_y1 = center_y + radius_y;draw_y2 = draw_y3 = center_y - radius_y;draw_point(draw_x0, draw_y0, color); // 画y轴上的两个端点draw_point(draw_x2, draw_y2, color);while( (radius_yy*xx) < (radius_xx*yy) ){if(di<0)di+= radius_yy2*(2*xx+3);else{di+=radius_yy2*(2*xx+3)+4*radius_xx-4*radius_xx*yy;yy--;draw_y0--;draw_y1--;draw_y2++;draw_y3++;}xx ++; // x轴加1draw_x0++;draw_x1--;draw_x2++;draw_x3--;draw_point(draw_x0, draw_y0, color);draw_point(draw_x1, draw_y1, color);draw_point(draw_x2, draw_y2, color);draw_point(draw_x3, draw_y3, color);}di=radius_xx2*(yy-1)*(yy-1)+radius_yy2*xx*xx+radius_yy+radius_yy2*xx-radius_xx2*radius_yy; while(yy>=0){ if(di<0){ di+= radius_xx2*3 + 4*radius_yy*xx + 4*radius_yy - 2*radius_xx2*yy;xx ++; // x轴加1draw_x0++;draw_x1--;draw_x2++;draw_x3--;}else{ di += radius_xx2*3 - 2*radius_xx2*yy;}yy--;draw_y0--;draw_y1--;draw_y2++;draw_y3++;draw_point(draw_x0,draw_y0,color);draw_point(draw_x1,draw_y1,color);draw_point(draw_x2,draw_y2,color);draw_point(draw_x3,draw_y3,color);}}。