Library to control a QVGA TFT connected to SPI. You can use printf to print text The lib can handle different fonts, draw lines, circles, rect and bmp
Dependents: TFT_Test1 SourceCodePro31-SB Mandelbrot Mindwave-screen ... more
See http://mbed.org/cookbook/SPI-driven-QVGA-TFT for details.
Revision 18:52cbeede86f0, committed 2013-10-22
- Comitter:
- dreschpe
- Date:
- Tue Oct 22 20:17:29 2013 +0000
- Parent:
- 16:2efcbb2814fa
- Commit message:
- The last change was made on the wrong code. Fix back the kinetis support .
Changed in this revision
SPI_TFT.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/SPI_TFT.cpp Mon Mar 25 10:11:00 2013 +0000 +++ b/SPI_TFT.cpp Tue Oct 22 20:17:29 2013 +0000 @@ -24,6 +24,7 @@ // 03.02.13 add a switch to switch off DMA use for LPC11U24 // 04.03.13 add support for new Kinetis board // 25.03.13 fix Bug in bitmap for Kinetis board +// 18.10.13 Better Circle function from Michael Ammann #include "SPI_TFT.h" #include "mbed.h" @@ -450,120 +451,37 @@ _cs = 1; } -// draw circle void SPI_TFT::circle(int x0, int y0, int r, int color) +{ + int x = -r, y = 0, err = 2-2*r, e2; + do { + pixel(x0-x, y0+y,color); + pixel(x0+x, y0+y,color); + pixel(x0+x, y0-y,color); + pixel(x0-x, y0-y,color); + e2 = err; + if (e2 <= y) { + err += ++y*2+1; + if (-x == y && e2 <= x) e2 = 0; + } + if (e2 > x) err += ++x*2+1; + } while (x <= 0); + +} + +void SPI_TFT::fillcircle(int x0, int y0, int r, int color) { - - int draw_x0, draw_y0; - int draw_x1, draw_y1; - int draw_x2, draw_y2; - int draw_x3, draw_y3; - int draw_x4, draw_y4; - int draw_x5, draw_y5; - int draw_x6, draw_y6; - int draw_x7, draw_y7; - int xx, yy; - int di; - //WindowMax(); - if (r == 0) { /* no radius */ - return; - } - - draw_x0 = draw_x1 = x0; - draw_y0 = draw_y1 = y0 + r; - if (draw_y0 < height()) { - pixel(draw_x0, draw_y0, color); /* 90 degree */ - } - - draw_x2 = draw_x3 = x0; - draw_y2 = draw_y3 = y0 - r; - if (draw_y2 >= 0) { - pixel(draw_x2, draw_y2, color); /* 270 degree */ - } - - draw_x4 = draw_x6 = x0 + r; - draw_y4 = draw_y6 = y0; - if (draw_x4 < width()) { - pixel(draw_x4, draw_y4, color); /* 0 degree */ - } - - draw_x5 = draw_x7 = x0 - r; - draw_y5 = draw_y7 = y0; - if (draw_x5>=0) { - pixel(draw_x5, draw_y5, color); /* 180 degree */ - } - - if (r == 1) { - return; - } - - di = 3 - 2*r; - xx = 0; - yy = r; - while (xx < yy) { - - if (di < 0) { - di += 4*xx + 6; - } else { - di += 4*(xx - yy) + 10; - yy--; - draw_y0--; - draw_y1--; - draw_y2++; - draw_y3++; - draw_x4--; - draw_x5++; - draw_x6--; - draw_x7++; + int x = -r, y = 0, err = 2-2*r, e2; + do { + vline(x0-x, y0-y, y0+y, color); + vline(x0+x, y0-y, y0+y, color); + e2 = err; + if (e2 <= y) { + err += ++y*2+1; + if (-x == y && e2 <= x) e2 = 0; } - xx++; - draw_x0++; - draw_x1--; - draw_x2++; - draw_x3--; - draw_y4++; - draw_y5++; - draw_y6--; - draw_y7--; - - if ( (draw_x0 <= width()) && (draw_y0>=0) ) { - pixel(draw_x0, draw_y0, color); - } - - if ( (draw_x1 >= 0) && (draw_y1 >= 0) ) { - pixel(draw_x1, draw_y1, color); - } - - if ( (draw_x2 <= width()) && (draw_y2 <= height()) ) { - pixel(draw_x2, draw_y2, color); - } - - if ( (draw_x3 >=0 ) && (draw_y3 <= height()) ) { - pixel(draw_x3, draw_y3, color); - } - - if ( (draw_x4 <= width()) && (draw_y4 >= 0) ) { - pixel(draw_x4, draw_y4, color); - } - - if ( (draw_x5 >= 0) && (draw_y5 >= 0) ) { - pixel(draw_x5, draw_y5, color); - } - if ( (draw_x6 <=width()) && (draw_y6 <= height()) ) { - pixel(draw_x6, draw_y6, color); - } - if ( (draw_x7 >= 0) && (draw_y7 <= height()) ) { - pixel(draw_x7, draw_y7, color); - } - } - return; -} - -void SPI_TFT::fillcircle(int x, int y, int r, int color) -{ - int i; - for (i = 0; i <= r; i++) - circle(x,y,i,color); + if (e2 > x) err += ++x*2+1; + } while (x <= 0); }