1、附件附件: 图图 4 连杆机构动画程序连杆机构动画程序 ! 图 4 的动画程序 SET WINDOW -22, 58, -35, 23 ！窗口的长宽比应该与屏幕窗口的一样，大约为 4：3，这 样画出来的图形才不会变形。 OPTION NOLET W1=10 ：XE=0：YE=0：XB=41：YB=0：XF=0：YF=-34：LED=14 LDA=39：LBA=28：ADC=35：LDC=15：LFG=55：R=0.5 FOR I=0 TO 3600 STEP 2 ！准备转 10 圈，原动件每次转 2 度。 CALL LINK(XE, YE, 0, 0, 0, 0, I*PI/180, W1,
2、0, LED, XD, YD, VDX, VDY, ADX, ADY) CALL RRR(XD, YD, VDX, VDY, ADX, ADY, XB, YB, 0, 0, 0, 0, LDA, LBA, QDA, W3, E3, QBA, W2, E2) CALL LINK(XD, YD, VDX, VDY, ADX, ADY, QDA, W3, E3, LDA, XA, YA, VAX, VAY, AAX, AAY) ！为了画动画，必须求出 A 点坐标 QDC=QDA+ADC*PI/180 CALL LINK(XD, YD, VDX, VDY, ADX, ADY, QDC, W3, E3,
3、 LDC, XC, YC, VCX, VCY, ACX, ACY) CALL RPR(0, XF,YF,0,0,0,0, XC,YC,VCX,VCY, ACX, ACY, 0, QFG, W4, E4) CALL LINK(XF,YF,0,0,0,0,QFG,W4,E4, LFG, XG,YG,VGX,VGY,AGX, AGY) CLEAR ! 清屏幕 PLOT XE,YE;XD,YD;XA,YA;XB,YB !画折线 EDAB PLOT XD,YD;XC,YC;XA,YA ! 画折线 DCA PLOT XF,YF;XG,YG ! 画折线 FG BOX CIRCLE -R,R,-R,R ! 在
4、 Xmin=-R, Xmax=R,Ymin=-R,Ymax=R 的矩形内画椭圆, 即:以(0,0)为圆心,以 R 为半径画圆(转动副) PLOT TEXT, AT XE+1,YE:“E“ ! 在 E 处写字符 E BOX CIRCLE XD-R,XD+R,YD-R,YD+R !在Xmin=XD-R, Xmax=XD+R,Ymin=YD-R,Ymax=YD+R 的矩形内画椭圆,即:以(XD,YD)为圆心,以 R 为半径 画圆. PLOT TEXT, AT XD+1,YD:“D“ ! 在 D 处写字符 D BOX CIRCLE XA-R,XA+R,YA-R,YA+R PLOT TEXT, AT X
5、A+1,YA:“A“ BOX CIRCLE XB-R,XB+R,YB-R,YB+R PLOT TEXT, AT XB+1,YB:“B“ BOX CIRCLE XF-R,XF+R,YF-R,YF+R PLOT TEXT, AT XF+1,YF:“F“ BOX CIRCLE XC-R,XC+R,YC-R,YC+R PLOT TEXT, AT XC+1,YC:“C“ PLOT TEXT, AT XG+1,YG:“G“ PAUSE 0.2 !画完每幅图后,暂停 0.2 秒. NEXT I END SUB LINK(XA, YA, VAX, VAY, AAX, AAY, QAB, W, E, L, XB
6、, YB, VBX, VBY, ABX, ABY) XB=XA+L*COS(QAB) YB=YA+L*SIN(QAB) VBX=VAX-L*SIN(QAB)*W VBY=VAY+L*COS(QAB)*W ABX=AAX-L*COS(QAB)*W2-L*SIN(QAB)*E ABY=AAY-L*SIN(QAB)*W2+L*COS(QAB)*E END SUB SUB RRR(XA, YA, VAX, VAY, AAX, AAY, XC, YC, VCX, VCY, ACX, ACY, LAB, LCB, QAB, WAB, EAB, QCB, WCB, ECB) LAC=SQR(XC-XA)2+
7、(YC-YA)2) COSQAC=(XC-XA)/LAC SINQAC=(YC-YA)/LAC QAC=ANGLE(COSQAC,SINQAC) COSQCBA=(LAB2+LAC2-LCB2)/(2*LAB*LAC) SINQCBA=SQR(1-COSQCBA2) QCBA=ANGLE(COSQCBA,SINQCBA) QAB=QAC-QCBA XB=XA+LAB*COS(QAB) YB=YA+LAB*SIN(QAB) COSQCB=(XB-XC)/LCB SINQCB=(YB-YC)/LCB QCB=ANGLE(COSQCB,SINQCB) WAB=(VAX-VCX)*COSQCB+(VA
8、Y-VCY)*SINQCB)/LAB/SIN(QAB-QCB) WCB=(VAX-VCX)*COS(QAB)+(VAY-VCY)*SIN(QAB)/LCB/SIN(QAB-QCB) G=AAX-ACX-LAB*COS(QAB)*WAB2+LCB*COSQCB*WCB2 F=AAY-ACY-LAB*SIN(QAB)*WAB2+LCB*SINQCB*WCB2 EAB=(G*COSQCB+F*SINQCB)/LAB/SIN(QAB-QCB) ECB=(G*COS(QAB)+F*SIN(QAB)/LCB/SIN(QAB-QCB) END SUB SUB RPR(M, XA, YA, VAX, VAY,
9、 AAX, AAY, XC, YC, VCX, VCY, ACX, ACY, LAB, QBD, W, E) LAC=SQR(XC-XA)2+(YC-YA)2) COSQAC=(XC-XA)/LAC SINQAC=(YC-YA)/LAC QAC=ANGLE(COSQAC,SINQAC) LBC=SQR(LAC2-LAB2) QACB=ATN(LAB/LBC) QBD=QAC+M*QACB DELTA=-(YC-YA)*SIN(QBD)-(XC-XA)*COS(QBD) DELTAW=(VCX-VAX)*SIN(QBD)-(VCY-VAY)*COS(QBD) DELTAV=-(YC-YA)*(VCY-VAY)-(XC-XA)*(VCX-VAX) W=DELTAW/DELTA VLBC=DELTAV/DELTA T1=(ACX-AAX)+(VCY-VAY)*W+SIN(QBD)*W*VLBC T2=(ACY-AAY)-(VCX-VAX)*W-COS(QBD)*W*VLBC DELTAE=T1*SIN(QBD)-T2*COS(QBD) E=DELTAE/DELTA END SUB
