Draw the COONS curve. First draw a tangent to the curve in the drawing area, and then automatically plot the curve out. Computer graphics more difficult questions.

MFCWORK5_COONS_CURVE\Debug\MFCWORK5_COONS_CURVE.exe
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....................\.....\MFCWORK5_COONS_CURVE.pdb
....................\MFCWORK5_COONS_CURVE\Debug\CL.read.1.tlog
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....................\....................\.....\link-cvtres.read.1.tlog
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....................\....................\.....\link.read.1.tlog
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....................\....................\.....\MainFrm.obj
....................\....................\.....\MFCWORK5_COONS_CURVE.exe.embed.manifest
....................\....................\.....\MFCWORK5_COONS_CURVE.exe.embed.manifest.res
....................\....................\.....\MFCWORK5_COONS_CURVE.exe.intermediate.manifest
....................\....................\.....\MFCWORK5_COONS_CURVE.lastbuildstate
....................\....................\.....\MFCWORK5_COONS_CURVE.log
....................\....................\.....\MFCWORK5_COONS_CURVE.obj
....................\....................\.....\MFCWORK5_COONS_CURVE.pch
....................\....................\.....\MFCWORK5_COONS_CURVE.res
....................\....................\.....\MFCWORK5_COONS_CURVEDoc.obj
....................\....................\.....\MFCWORK5_COONS_CURVEView.obj
....................\....................\.....\MFCWORK5_COONS_CURVE_manifest.rc
....................\....................\.....\mt.read.1.tlog
....................\....................\.....\mt.write.1.tlog
....................\....................\.....\rc.read.1.tlog
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....................\....................\.....\stdafx.obj
....................\....................\.....\vc100.idb
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....................\....................\MainFrm.cpp
....................\....................\MainFrm.h
....................\....................\MFCWORK5_COONS_CURVE.APS
....................\....................\MFCWORK5_COONS_CURVE.cpp
....................\....................\MFCWORK5_COONS_CURVE.h
....................\....................\MFCWORK5_COONS_CURVE.rc
....................\....................\MFCWORK5_COONS_CURVE.vcxproj
....................\....................\MFCWORK5_COONS_CURVE.vcxproj.filters
....................\....................\MFCWORK5_COONS_CURVE.vcxproj.user
....................\....................\MFCWORK5_COONS_CURVEDoc.cpp
....................\....................\MFCWORK5_COONS_CURVEDoc.h
....................\....................\MFCWORK5_COONS_CURVEView.cpp
....................\....................\MFCWORK5_COONS_CURVEView.h
....................\....................\ReadMe.txt
....................\....................\res\MFCWORK5_COONS_CURVE.ico
....................\....................\...\MFCWORK5_COONS_CURVE.rc2
....................\....................\...\MFCWORK5_COONS_CURVEDoc.ico
....................\....................\...\Toolbar.bmp
....................\....................\...\Toolbar256.bmp
....................\....................\resource.h
....................\....................\stdafx.cpp
....................\....................\stdafx.h
....................\....................\targetver.h
....................\....................\UserImages.bmp
....................\MFCWORK5_COONS_CURVE.sdf
....................\MFCWORK5_COONS_CURVE.sln
....................\MFCWORK5_COONS_CURVE.suo
....................\使用说明.txt
....................\ipch\mfcwork5_coons_curve-667cad88
....................\MFCWORK5_COONS_CURVE\Debug
....................\....................\res
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