基于bresenham算法的LCD12864绘图

/******************************************************************************************* 说明：12864字符串显示和绘图函数，包含圆、直线、椭圆的bresenham画法 完成日期：2012.12.18 作者：HB ********************************************************************************************/ //8*16单字符显示函数，x，y表示横纵坐标，str为要现实的字符编码数组 #include <math.h> /*void dispchar8(uchar x,uchar y,uchar *str) { if(x<8) play8(0,x,y,str); //屏 列 页 else play8(1,(x&0x07),y,str); //delay1ms(200); } */ #define dispchar8(x,y,str) play8((x)>>3,(x)&0x07,y,str) //8*16连续字符显示函数，x，y表示横纵坐标，str为要现实的字符编码数组，lengsh为要显示的长度 void dispstr8(uchar x,uchar y,uchar *str,uchar length) { uchar i; for(i=0;i<length;i++) {dispchar8(x+i,y,str); str+=16; } } //16*16单字符显示函数，x，y表示横纵坐标，str为要现实的字符编码数组 void dispchar16(uchar x,uchar y,uchar *str) { if(x<4) play16(0,x<<1,y,str); //屏 列 页 else play16(1,(x&0x03)<<1,y,str); //delay1ms(200); } //16*16连续字符显示函数，x，y表示横纵坐标，str为要现实的字符编码数组，lengsh为要显示的长度 void dispstr16(uchar x,uchar y,uchar *str,uchar length) { uchar i; for(i=0;i<length;i++) {dispchar16(x++,y,str); str+=32; } } /****************************************************************************************** 几个绘图函数 ******************************************************************************************/ //在屏幕上画一条直线，参数(x1,y1)(x2,y2)为起点终点坐标 void line(uchar x1,uchar y1,uchar x2,uchar y2) { uchar x; if(x1<x2) for(x=x1;x<=x2;x++)dot(x,y1+(int)(x-x1)*(y2-y1)/(x2-x1)); else if(x1==x2) { /*if(y1<=y2) for(x=y1;x<=y2;x++)dot(x1,x); else for(x=y2;x<=y1;x++)dot(x1,x);*/ vertical(y1,y2,x1);//画竖线 } else for(x=x2;x<=x1;x++)dot(x,y2+(int)(x-x2)*(y2-y1)/(x2-x1)); } //使用Bresenham画直线，包括起始点，不包括终点 void Line_Bresenham(uchar x1, uchar y1, uchar x2, uchar y2) { uchar x = x1; uchar y = y1; uchar dx = abs(x2 - x1); uchar dy = abs(y2 - y1); char s1 = x2 > x1 ? 1 : -1; char s2 = y2 > y1 ? 1 : -1; uchar temp; int p; uchar i; bit interchange = 0; // ????? dx?dy if (dy > dx) // 斜率大于1时dx dy互换 { temp = dx; dx = dy; dy = temp; interchange = 1; } p = 2 * dy - dx; for( i = 0; i < dx; i++) { dot(x, y); if (p >= 0) { if (!interchange) // ??? < 1 ?,??????? y += s2; else // ??? > 1 ?,??????? x += s1; p -= 2 * dx; } if (!interchange) x += s1; // ??? < 1 ?,?? x ??? else y += s2; // ??? > 1 ?,?? y ??? p += 2 * dy; } } //自定义画圆函数 void hbCircle(uchar x,uchar y,uchar r) //顺时针方向画图 { uchar i,j; uchar x1,y1;//对称点坐标 for(i=x+r;i>=x+r*7/10;i--) //只计算第四象限 //for(j=x+r+y-i;j<=y-x+i;j++) // 只计算面积为r*r/4 的三角形内的点 for(j=x+r+y-i;j<=x+r+(r>>1)+y-i;j++) // 进一步缩小计算的面积部分 { //if(2*x<i||i>127||2*y<j||j>63)continue; //如果点落在屏幕外，则跳过 if(abs((i-x)*(i-x)+(j-y)*(j-y)-r*r)<=r) //画圆函数关键算法 { dot(i,j); dot(x*2-i,j); dot(i,y*2-j); dot(x*2-i,y*2-j); // 计算关于直线斜对称的点 y1=y-x+i; x1=x-y+j; dot(x1,y1); dot(x*2-x1,y1); dot(x1,y*2-y1); dot(x*2-x1,y*2-y1); } } } // 正负画圆法。画出的圆有点不规则 void Circle_PN(uchar x, uchar y, uchar r) { uchar tx = 0, ty = r; int f = 0; while(tx <= ty) { // 8分法 dot(x + tx, y + ty); dot(x + tx, y - ty); dot(x - tx, y + ty); dot(x - tx, y - ty); dot(x + ty, y + tx); dot(x + ty, y - tx); dot(x - ty, y + tx); dot(x - ty, y - tx); if(f <= 0) f = f + (tx<<1) + 1, tx++; else f = f - (ty<<1) + 1, ty--; } } // 中点Bresenham画圆法 void Circle_Midpoint(uchar x, uchar y, uchar r) { uchar tx = 0,ty = r; int d = 1 - r; while(tx <= ty) { // ??????????? dot(x + tx, y + ty); dot(x + tx, y - ty); dot(x - tx, y + ty); dot(x - tx, y - ty); dot(x + ty, y + tx); dot(x + ty, y - tx); dot(x - ty, y + tx); dot(x - ty, y - tx); if(d < 0) d += 2 * tx + 3; else d += 2 * (tx - ty) + 5, ty--; tx++; } } //Bresenham法画圆，比较规则 void Circle_Bresenham(uchar x, uchar y, uchar r) { uchar tx = 0,ty = r; int d = 3 - (r<<1); while( tx <= ty) { // ??????????? dot(x + tx, y + ty); dot(x + tx, y - ty); dot(x - tx, y + ty); dot(x - tx, y - ty); dot(x + ty, y + tx); dot(x + ty, y - tx); dot(x - ty, y + tx); dot(x - ty, y - tx); if (d < 0) // ????? d += (tx<<2) + 6; else // ????? d += ((tx - ty)<<2) + 10, ty--; tx++; } } //Bresenham画椭圆算法 //输入参数：长轴，短轴，中心坐标 void drawEllipse (char a, char b, uchar xLoc,uchar yLoc) //int { char x, y; //int float d1, d2, aa, bb; aa = a * a; bb = b * b; d1 = bb + aa * (-b + 0.25); x = 0; y = b; dot (xLoc+ x, yLoc +y); dot (xLoc-x, yLoc+y); dot (xLoc-x, yLoc-y); dot (xLoc +x, yLoc-y); while (bb * (x + 1) < aa * (y - 0.5)) { if (d1 <= -0.000001) { d1 += bb * ((x << 1) + 3); } else { d1 += bb * ((x << 1) + 3) + aa * (2 - (y << 1)); -- y; } ++ x; dot (xLoc+ x, yLoc+ y); dot (xLoc-x, yLoc +y); dot (xLoc-x, yLoc-y); dot ( xLoc+x,yLoc -y); } d2 = bb * (0.25 * x) + aa * (1 - (y << 1)); while (y > 0) { if (d2 <= -0.000001) { ++ x; d2 += bb * ((x + 1) << 1) + aa * (3 - (y << 1)); } else { d2 += aa * (3 - (y << 1)); } -- y; dot (xLoc+ x, yLoc+ y); dot (xLoc-x,yLoc -y); dot (xLoc-x, yLoc+y); dot (xLoc+ x, yLoc-y); } } //画矩形 void rectangle(uchar x1,uchar y1,uchar x2,uchar y2 ) { vertical(y1,y2,x1);//画竖线 //line(x1,y1,x1,y2 ); line(x1,y1,x2,y1 ); vertical(y1,y2,x2);//画竖线 //line(x2,y1,x2,y2 ); line(x1,y2,x2,y2 ); }