这是昨天程序的升级版,增加了缩放、移动、参数显示等功能。一个手指可以拖到图形,两个手指靠近或分开可以缩放。
/ Y' d( Y+ ~# T- n3 O6 z9 J1 b8 ^
) x5 A N$ f7 d) \! Z* g x4 h) Z此外使用了Guess算法减少计算次数,加快显示速度。0 D+ E6 r# v' U D: A" L
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目前已知问题,手势识别还不够灵敏,等待进一步改进。 B/ ^) e' P2 U% ]# j$ V4 l5 W/ k
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- #include "mbed.h"
5 m' `- t4 c$ Z2 z- S - #include "LCD_DISCO_F746NG.h" M- o/ H& e" I; @! V( |7 K
- #include "TS_DISCO_F746NG.h"
- m! d+ w' Z* J6 g$ h2 C - #include <math.h>3 X3 W$ n6 s! p! D
- ! h8 p8 c9 q! x7 g
- #define ITERATION 1503 Y3 n7 i; l6 h3 ]
- #define BAILOUT 4
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6 I' ]+ ~! U( x; W" Q- LCD_DISCO_F746NG lcd;
+ j' A# s& {& q* F2 c$ N - TS_DISCO_F746NG ts;& Y3 d$ a$ Q/ i% |% q
- TS_StateTypeDef TS_State;
L& E& {5 F( {/ Z! C8 b2 b& J7 N - uint8_t ts_nb = 0;
1 u M j) E7 m1 F& r8 |
& J* g- q4 F o# `9 p4 I/ f- uint16_t tsx0[2], tsy0[2];
- }, R3 O5 F7 d - uint16_t tsx[2], tsy[2];
7 Z* \1 D7 d5 l# V% e5 M( A s - uint8_t tscnt = 0;
- q' f" \8 k m9 b- P - double zoom = 1;
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- Timer tmr;
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- uint8_t msg[20];% Q3 x' c5 i& R- k$ z* n( ~0 u5 {
- uint16_t screen_width, screen_height;' C5 g B4 H0 `! K; Q' N+ c
2 d' d2 Y' P4 S) M" K8 V* ~8 c- double mx1, my1, mx2, my2;' B$ C m+ Z6 U2 H
- ! H$ Z$ l5 @6 y6 r2 d x8 v0 q
- uint16_t calcMandelBrot(double x, double y), o% E' ^3 e: C$ K2 u
- {
1 i/ p; z( n* R) B. k9 w+ i9 d: S - uint16_t i;# M' `0 B3 {( K) N, B
- double xx, yy, tx, ty;5 E! {5 }" f- j6 U
-
; c# Y+ [" C4 i: S" z/ ]& ^" ?3 Q - xx = yy = 0;
7 ~7 U# O: i2 c/ d - i = 0;9 K- O$ J$ ]# A1 P
- while((i < ITERATION) && ((xx*xx + yy*yy) < BAILOUT))
' Q9 e* j6 k+ R( U- G1 I$ c" @ - {
2 Q& D. j6 l) J# d( v/ g5 [0 ` - tx = xx*xx - yy*yy + x;) T$ K' d) l5 L. N7 [, E6 k# h6 L' ]$ F6 |
- ty = 2*xx*yy + y;. c c' _5 N% O+ x6 n5 M9 @
- xx = tx; }& g' t; G& Z: a/ s' f& U2 I+ w2 U
- yy = ty;
+ C; K6 `5 @6 t - i++;* S+ w; }8 s# ]& U
- }8 i! _# u9 |" D" P+ `
- return i;% h1 C2 A! Q. z# W4 ^5 s9 ?* q# O
- } }7 O3 \, \ A
3 x" v$ O: x- }4 m2 t- uint8_t c[150][100];" e( i7 U) b! t9 K, P* o Z
- void rectMandelBrot(double x1, double y1, double x2, double y2)
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- double dx, dy;" A6 d- ]7 m; W, Q' {
- uint16_t i, j, n;) w# e8 m: [0 t, b3 D9 f
- uint32_t color;' c/ |3 Z3 e: \' m
- % m, ^6 A4 k2 n& Y( e, P% A4 @( _7 b
- lcd.SetTextColor(LCD_COLOR_BLACK);' U" \, Y) u, s; M+ z' ~
- lcd.FillRect(0, 0, screen_width, screen_height);
, j0 v7 M: r0 G) M: I* Q% n - lcd.SetTextColor(LCD_COLOR_WHITE);
8 F, ^$ C* I9 A - sprintf((char *)msg, "%10f", x1);
# H% E* a/ H3 G% u8 { - lcd.DisplayStringAt(screen_width+5, 224, msg, LEFT_MODE); @7 E7 o7 T8 M7 k
- sprintf((char *)msg, "%10f", y1);
+ e" Z& k7 [' n2 ^# e) ~/ E$ { v - lcd.DisplayStringAt(screen_width+5, 236, msg, LEFT_MODE);) J- o& \+ C; g6 C. X5 ? A
- sprintf((char *)msg, "%10f", x2);
: X# I! u! ~9 ?3 A2 P4 Z9 X" O - lcd.DisplayStringAt(screen_width+5, 248, msg, LEFT_MODE);
! Z% o% U( n8 Y# b4 l% j - sprintf((char *)msg, "%10f", y2);; J `& D0 u4 T
- lcd.DisplayStringAt(screen_width+5, 260, msg, LEFT_MODE);
) s! L) E; D4 F+ T - sprintf((char *)msg, " %10f", zoom);5 {4 R( @0 \( q2 }, m3 S, ~0 F
- lcd.DisplayStringAt(screen_width+5, 212, msg, LEFT_MODE);
4 C" Y" x; v0 }5 [ -
0 A N3 p1 |4 v4 H# w# s. j - tmr.reset();' k# y) D+ d. y8 Z" N
- tmr.start();! T, {& N$ Q* j
-
# n( {$ q* B$ T9 s - dx = (x2 - x1)/screen_width;
0 {2 n s' ~9 P3 f( |8 |) c% | - dy = (y2 - y1)/screen_height;: _ y/ j: f# ^3 p$ E& K
- /*
8 X) M0 n! [- {2 } - for(i = 0; i < screen_width; i++)1 H, b. j, [# @. j
- {
1 O) r" v6 I0 p& W' e - for(j = 0; j < screen_height; j++)
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! X0 k) q, S& h) k F( C - color = calcMandelBrot(x1 + dx*i, y1 + dy*j);/ `2 q: x5 a; {
- lcd.DrawPixel(i, j, 0xFF000000 | (color<<14) | (color <<4));: K. L2 ?- U( p( R
- }1 ^. x C: ~: O6 Z: e0 K
- }*/
: i* k# P0 y t9 L2 H - for(i = 0; i < screen_width/4; i++)0 c% l6 R- v1 \0 v( ?& v
- {
7 K$ M! I; N! |8 f. c2 ] - ts.GetState(&TS_State);# r% I* H6 {% |) ^9 h2 c7 }
- if (TS_State.touchDetected)% y- _4 _, y' y- W7 X% l
- return;5 m6 C- I Z9 H( Y- r
- for(j = 0; j < screen_height/4; j++)! \5 _: d% T+ L0 w$ H: D4 Z* W
- {; n* b9 h# T7 |3 u
- c[i][j] = calcMandelBrot(x1 + 4*dx*i, y1 + 4*dy*j);
- |+ w& \9 ?% J - lcd.DrawPixel(4*i, 4*j, 0xFF000000 | (c[i][j]<<4));) V. z7 j% q7 G) [- h
- }7 O% m7 y/ D+ H' v
- }0 o- v7 _+ d# R2 P, g' D5 @
- " W4 q5 F- F3 Q, m* P) B
- for(i = 0; i < screen_width/4; i++)5 {7 M0 Q3 s. [1 L4 f* j1 ^: ~
- {6 Z% p( Y5 d6 `9 O& `
- ts.GetState(&TS_State);5 U! d x# k; j' Y3 C
- if (TS_State.touchDetected)
% H- p E( m1 g2 T: M: U8 j - return;' b& t& h( b Z: R* y
- for(j = 0; j < screen_height/4; j++)5 i$ E# C6 B5 E
- {& p t' D, f- m
- if((c[i][j] == c[i+1][j]) && (c[i][j] == c[i+1][j+1]) && (c[i][j] == c[i][j+1]))! ?+ `, U( u* x2 ^2 k' D
- {
. V- e4 L, j8 y- p* ~ - lcd.SetTextColor(0xFF000000 | (c[i][j]<<4));6 R6 a# |, I. q3 I" a
- lcd.FillRect(i*4, j*4, 4, 4); + e: e! j2 C$ _7 j+ {
- }3 W% v( r4 x- ]5 {( N) _+ }3 e. F
- else* G m& u' Y. s+ j1 H ]
- {
+ C; C1 _1 b3 I3 I( v; o5 K - for(n = 1; n < 16; n++)9 z8 i) |- Y9 K! T5 z: W) R- H& x$ r
- {
$ o$ F/ L; Q; s6 A - color = calcMandelBrot(x1 + dx*(4*i+(n/4)), y1 + dy*(4*j+(n%4)));+ i9 P) D* I1 T' I# V8 r9 A
- lcd.DrawPixel(4*i+(n/4), 4*j+(n%4), 0xFF000000 | (color<<4));
- a) U/ ]6 g6 y+ S6 D' N# D - }
2 C1 K/ C v' K3 j6 f - }
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- }
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- tmr.stop();7 Y% @5 n3 G) J
-
" S+ B4 _3 K5 C) s5 g" ~ - sprintf((char *)msg, " %6d ms", tmr.read_ms());
8 _3 W5 S/ M# \& K' Q1 m9 _+ X U; _ - lcd.SetTextColor(LCD_COLOR_WHITE);
( s4 J" S) [- Q* y - lcd.SetBackColor(LCD_COLOR_BLACK);, Z: c- r" }. ~
- lcd.DisplayStringAt(screen_width+5, 20, msg, LEFT_MODE);' j4 _' u) b3 Z9 A+ D; t. o% s
- }
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- int main()
% i3 Y4 h4 T& ]- w" d- {1 P - {
1 P7 `+ n$ j$ b. g9 E, ^0 Z9 w - uint8_t status;
, L2 ~1 [9 |! x s - uint8_t prev_nb_touches = 0;) @, l0 F- s y5 P
- double cx, cy, lx, ly;
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- status = ts.Init(lcd.GetXSize(), lcd.GetYSize()); 4 {# t3 u& w \- N2 I2 F0 c+ }* z
- if (status != TS_OK) {$ w8 V" X- O' i' `
- lcd.Clear(LCD_COLOR_RED);8 _$ ^% w% n7 X* y( F8 F0 u1 U
- lcd.SetBackColor(LCD_COLOR_RED);* m: M0 ^# E; T" R. d0 }
- lcd.SetTextColor(LCD_COLOR_WHITE);! N, h# M- D8 k! z# y1 ?( J
- lcd.DisplayStringAt(0, LINE(5), (uint8_t *)"TOUCHSCREEN INIT FAIL", CENTER_MODE);- J2 l8 e& q' h5 q# C
- ; c1 P# c |+ q1 H* R6 b
- while(1);) w: W4 Z$ l( I I$ g+ F; z
- }
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- lcd.Clear(LCD_COLOR_BLACK);
' \7 m* w8 O7 ?1 n5 [( Y - lcd.SetFont(&Font12);
/ D2 t }7 P9 ` - lcd.SetTextColor(LCD_COLOR_WHITE);' y- w g- _8 ~1 k0 c# } G9 b
- lcd.SetBackColor(LCD_COLOR_BLACK);0 P% C% I! s7 ?4 d3 v( ?
- . Y4 K+ M* Q9 X) `$ r0 u* ~6 J
- screen_width = lcd.GetXSize() - 120;+ n7 l, d5 b4 f' N. g; ?' h% p
- screen_height = lcd.GetYSize();
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- lcd.DisplayStringAt(screen_width+5, 0, (uint8_t *)"Elapsed:", LEFT_MODE);
( P: |; E3 z& K( A; \- N" d - lcd.DisplayStringAt(screen_width+5, 200, (uint8_t *)"Zoom:", LEFT_MODE);
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5 t5 m; t) l- V- Z, B - mx1 = -2.5;# r# `8 E. H! V9 T
- my1 = -2.5;& W/ o. `5 T& z' T" |4 G) c! o
- mx2 = 2.5;
- e* b3 y" [- W5 s9 Q - my2 = 2.5;
. i$ s+ k2 z. `/ n' }% G9 q - rectMandelBrot(mx1, my1, mx2, my2);0 Y% B) U" K, P
- 8 L) _; O9 x+ [# h+ P5 w
- status = 0;( P2 t( D4 X5 r- d+ A2 L
- while(1)
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8 V, U7 V3 `/ J5 q! G! h - wait(0.01);" f9 T6 w3 B/ G. A) T9 T; J
- ts.GetState(&TS_State);
+ P9 y: _1 p' n2 `/ _; z E - if (TS_State.touchDetected)
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- if(TS_State.touchDetected != prev_nb_touches)
$ Y* ~8 [! I- A9 S) J) | - {
1 s5 Q6 ?( w5 c O& ]' N( j - status = 0;
, L* d1 M6 k3 B! i. `3 o; l# b5 t - tscnt = 0;
! C! p: d3 h; q' I: o% J6 ~3 P s - prev_nb_touches = TS_State.touchDetected;
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- if(tscnt < 10)+ ~1 B5 j" R) j4 N! D2 R: d3 w; [
- {! C0 e" B* a0 p& V; a* N- Y. C
- tscnt++;0 z1 H# D {% G h2 v. f; L
- if(tscnt == 9)
6 K' p5 U! y/ w* y& p' z; p8 f( o* I) o - {, C7 ]8 @/ q, D& D a9 o
- ts_nb = TS_State.touchDetected;* C: ^" t( ~: [7 d. e
- lcd.SetTextColor(LCD_COLOR_BLACK);
% ?) t* n) m3 h9 m9 j- A* c9 P - lcd.FillRect(screen_width+5, 60, 120, 48);
' z$ m1 q$ |8 j9 g Z! ]5 o - }
. d3 @/ e% W; h; r3 I - continue;
# A- y% X/ y4 v& l6 b: h - }
. S ~+ x2 R7 L+ x -
6 \ c1 f& U& n - switch(ts_nb)7 U6 a% [ f% c6 d: h
- {
1 `/ Z, w4 P6 L* M5 t7 D) j8 D - case 1:
& x* s) r* G$ D! i2 K+ e6 U - if(status == 0)1 G: v+ E! Q, \: J+ e/ `' A: A
- {
& W) P' o0 P0 {3 r" v - status = 1;7 S/ N8 A: J$ ?! M2 `0 J
- tsx0[0] = TS_State.touchX[0];" F& M6 w- J+ P) X. ~
- tsy0[0] = TS_State.touchY[0];; e8 o U- i2 T/ f
- }$ E& @- r! U& |0 w2 h1 O9 u
- tsx[0] = TS_State.touchX[0];
6 t3 h! {4 r. t4 y% c: _+ [ - tsy[0] = TS_State.touchY[0];+ |- }) D9 Z* I; L& _! ~
- lcd.SetTextColor(LCD_COLOR_LIGHTBLUE);
& h* G0 p1 _) \6 s# l - sprintf((char *)msg, "%3d", TS_State.touchX[0]);
! O; ?4 G* c5 i( A, y+ F2 G - lcd.DisplayStringAt(screen_width+5, 60, msg, LEFT_MODE);
* w, V7 X l; x5 M" l" ?' n. I - sprintf((char *)msg, "%3d", TS_State.touchY[0]);' T% R& h8 Q% a+ _
- lcd.DisplayStringAt(screen_width+5, 72, msg, LEFT_MODE);
- {& w0 f- N1 z! Y6 l- c: V0 c - break;
7 K) m1 w; c% R, G2 z8 C9 { - case 2:: `: f2 U9 @. j) _. v4 j" {
- if(status == 0)7 O6 _* b: k2 Z5 ^: D4 W J2 {
- {
6 h1 q* `7 Y; B2 F - status = 1;
8 M' R7 ], n; m3 N0 } - tsx0[0] = TS_State.touchX[0];0 T% S: [: h$ x7 g* Q# T
- tsy0[0] = TS_State.touchY[0];! ^4 B! c' ^. }
- tsx0[1] = TS_State.touchX[1];! a J: s8 x* e# c1 H
- tsy0[1] = TS_State.touchY[1];
) L' k- i; {# \2 K! P7 t - }( w1 v" Z" G* T4 c( y9 H
- tsx[0] = TS_State.touchX[0];
2 C7 A% n6 y# P% P - tsy[0] = TS_State.touchY[0];5 U$ y1 ~: @) B5 k7 f! P
- tsx[1] = TS_State.touchX[1];
* ?: Z. X# {2 o3 E" y4 G* l - tsy[1] = TS_State.touchY[1];
" [7 _6 [' M" t, U) x - lcd.SetTextColor(LCD_COLOR_LIGHTBLUE);+ _/ o- r& g( J2 ~0 o9 K7 d4 z% d
- sprintf((char *)msg, "%3d", TS_State.touchX[0]);, b* M2 y# D) p! t* e3 y
- lcd.DisplayStringAt(screen_width+5, 60, msg, LEFT_MODE);6 X- ~1 |- L! d* z6 V
- sprintf((char *)msg, "%3d", TS_State.touchY[0]);
$ G4 r6 i% w& O% t2 {, f# Q - lcd.DisplayStringAt(screen_width+5, 72, msg, LEFT_MODE);
5 M& G& E* n7 h; c - sprintf((char *)msg, "%3d", TS_State.touchX[1]);
+ b, S ]& N l9 W( E! _ - lcd.DisplayStringAt(screen_width+5, 84, msg, LEFT_MODE);2 O$ X1 ^% b' W# k4 e
- sprintf((char *)msg, "%3d", TS_State.touchY[1]);7 G1 Y5 t7 M s9 t* A8 O+ ]' n
- lcd.DisplayStringAt(screen_width+5, 96, msg, LEFT_MODE);
. Z$ f1 \" a0 O6 r' v# ? - break;
- F" [& G6 K' V/ t6 Y0 v - }. K; |5 o" I9 O2 d$ \
- }; n$ y6 ?2 s5 f: s4 ]& Q+ \
- else; f% }2 I2 V8 a$ E+ S$ ^
- {
9 ^* \; N! E$ d7 M& }7 d! W- @* E - if(status). a9 V0 S2 D$ C/ t9 F( z% M- M
- {
: H9 x: f; G1 [. Z2 b: j8 [% S - lcd.SetTextColor(LCD_COLOR_YELLOW);
9 r" e' A0 y. H* {7 o - status = 0;, o& f: i% e9 g& y R
- tscnt = 0;
' G' A# ? B" f+ m' E* G - switch(ts_nb)8 N3 m1 [. O! N9 Q% O% `
- {
6 x, M* X7 _, i0 S8 x& o* t - case 1:* X# Z' r! M. y7 O
- if((abs(tsx[0] - tsx0[0]) > 20) || (abs(tsy[0] - tsy0[0]) > 20))
: I' O( E9 n8 ]5 j; J - {
# i k2 Z4 }4 V5 z - lcd.DisplayStringAt(screen_width+41, 200, (uint8_t *)" - ", LEFT_MODE);
, R3 e, U& F o' E& n9 E1 j) n( X' M - cx = (tsx[0] - tsx0[0])*(mx2 - mx1)/screen_width;% N9 x, J# M% K( C% C* A5 h" M
- cy = (tsy[0] - tsy0[0])*(my2 - my1)/screen_height;3 u6 X! ~5 T. A7 Z1 F1 |
- mx1 -= cx;# {8 Z+ e' s, y7 I9 z: u
- mx2 -= cx;
* j" n3 a) ~& a- ~ m/ u2 j - my1 -= cy;
& L% b; y- p A6 d( M5 x - my2 -= cy;3 C, B* d% I, c3 f V) G: _
- rectMandelBrot(mx1, my1, mx2, my2);
h2 T( B0 ^# W3 {+ c2 l - }
# d% ?$ K$ N0 D% l0 i6 x4 l: k - break;
- L7 E7 e$ `5 {4 g. f2 g9 n( j - case 2:4 P; e$ y# f5 K
- if(((tsx[0]-tsx[1])*(tsx[0]-tsx[1]) + 20) < ((tsx0[0]-tsx0[1])*(tsx0[0]-tsx0[1])))/ g6 x+ f' `! g' r8 K, F5 M
- {- J+ K) R$ b+ S! p# J! Y- x
- lcd.DisplayStringAt(screen_width+41, 200, (uint8_t *)"out", LEFT_MODE);3 r% U3 d- u0 P
- zoom = zoom /2;# C. s9 N2 }' @$ U+ f0 t% p* o: K& S
- cx = (tsx0[0] + tsx0[1])/2;
, ^' Z6 L* h" o* _" M. s - cy = (tsy0[0] + tsy0[1])/2;
1 p& x, J0 k$ ? - lx = (mx2 - mx1);
3 j5 g: z: f! d/ P - ly = (my2 - my1);
3 o, Z5 W, i+ X/ K# ] - cx = cx * (mx2 - mx1) / screen_width + mx1;+ L) F; |) g) H' L' K9 o8 }+ T& M
- cy = cy * (my2 - my1) / screen_height + my1;* D! |! d, O" m
- mx1 = cx - lx;. Z1 j- S, ]0 V! R
- mx2 = cx + lx;( n3 h- D! }$ T
- my1 = cy - ly;
- u0 {3 S0 f ^0 c - my2 = cy + ly;9 l; [. h2 m+ i: q! ~
- rectMandelBrot(mx1, my1, mx2, my2); - {8 H5 B* k4 x9 Q7 S0 M
- }" T3 |. M0 m8 E/ c$ A' C0 @$ o
- else if(((tsx[0]-tsx[1])*(tsx[0]-tsx[1])) > ((tsx0[0]-tsx0[1])*(tsx0[0]-tsx0[1]) + 20))
2 E6 \& A$ f0 i+ x& z8 ?& b - {
9 ^% P2 W$ P8 \: {& H - lcd.DisplayStringAt(screen_width+41, 200, (uint8_t *)"in ", LEFT_MODE);
$ B- H; K# ^# Z N/ ~9 q5 H - zoom = zoom*2;3 L; V1 H: }& p2 y
- cx = (tsx0[0] + tsx0[1])/2;
' i/ R. S) G w3 N+ g+ n v - cy = (tsy0[0] + tsy0[1])/2;7 _! Q" H8 ?+ V, y4 N
- lx = (mx2 - mx1)/4;
\ [% D% K3 Y$ O4 V5 P/ Q# P - ly = (my2 - my1)/4;
3 O+ U$ B$ ?8 K, R C - cx = cx * (mx2 - mx1) / screen_width + mx1;
# O4 W2 J2 s& l6 s/ P# J$ q/ S+ K - cy = cy * (my2 - my1) / screen_height + my1;: w) m/ @4 j8 q4 J2 j
- mx1 = cx - lx;) B3 v6 N, L P N7 D! R0 ?! g
- mx2 = cx + lx;
! H5 a" F; Q) g: { - my1 = cy - ly;
1 d( _& h2 v5 `0 ?# y8 _ - my2 = cy + ly;. ?7 `2 K$ B) |2 _; S9 e; E
- rectMandelBrot(mx1, my1, mx2, my2);
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复制代码
3 q6 u# L' e* R4 `编译后的BIN文件,可以直接下载运行。
DISCO-F746NG_fract.bin.zip
(31.95 KB, 下载次数: 6)
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这个是曼德布罗特集的图形,茱莉亚集的计算公式略有不同
给你提点意见.7 O0 p! R ~8 Q! m" U- h6 V9 O
一.迭代收敛的条件是,|z|<=2.写成<2会错过一些点,比如(-2,0)
二.仅靠4角同色不足以判断此矩形内同色.可能会在一些半岛周围漏掉几个点.% q6 w6 J6 m' H, P8 R5 v
正确的做法是:5 g- C( A: H1 f9 Y
1.每隔4点计算颜色.
2.将4角颜色不同的小矩形标记为pend.
3.计算所有pend矩形内的每个点的颜色.
将此矩形标记为done.
如此矩形不是纯色,将此矩形的4个邻居标记为pend(已是done的除外)
4.重复第3步,直到没有pend.6 {, _, g% B! E$ H
三.对于有FPU的单片机可以光明正大的用double,但没有FPU的就惨了,软件浮点算法特慢.! M. M+ t$ h9 z0 ^5 Z" C' G7 P
可以用定点数,小数点的位置有讲究,s5p26比较合适.比float精度稍高,也没有溢出问题.
要注意的是判断收敛时要当做u6p26来比较,因为|z|最大能到6,|z|2能到36,超出了s5p26的范围,但不会超出u6p26.2 a9 ] Q& J z
看来也是一个分形高手啊。这个程序的确不严谨,主要目的是为了演示STM32F7DISC开发板的使用,所以有些地方显得有些粗糙了。后续会继续改进,也希望大家一起来讨论和完善。