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74 lines
1.4 KiB
74 lines
1.4 KiB
8 years ago
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#include <string.h>
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#include "scrolltext.h"
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#include "font.h"
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#include "screendef.h"
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volatile bool text_moving;
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/**
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* Print text at coordinates
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* @param text
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* @param x
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* @param y
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*/
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void printtext(DotMatrix_Cfg *disp, const char *text, int x, int y)
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{
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int totalX = 0;
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for (int textX = 0; textX < (int)strlen(text); textX++) {
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uint8_t ch = (uint8_t)text[textX];
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if (ch < FONT_MIN) ch = '?';
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if (ch > FONT_MAX) ch = '?';
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ch -= ' '; // normalize for font table
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if (ch == 0) { // space
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totalX += 4;
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continue;
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}
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// one letter
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uint8_t blanks = 0;
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// skip empty space on right
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for (int charX = FONT_WIDTH-1; charX >= 0; charX--) {
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uint8_t col = font[ch][charX];
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if (col == 0x00) {
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blanks++;
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} else {
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break;
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}
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}
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for (int charX = 0; charX < FONT_WIDTH - blanks; charX++) {
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uint8_t col = font[ch][charX];
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for (int charY = 0; charY < 8; charY++) {
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dmtx_set(disp, x + totalX, y + 8 - charY, (col >> charY) & 1);
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}
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totalX++;
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}
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totalX+= 2; // gap
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}
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}
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/**
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* Scroll text across the screen
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* @param text
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* @param step delay per step (ms)
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*/
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void scrolltext(DotMatrix_Cfg *disp, const char *text, ms_time_t step)
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{
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(void)step;
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text_moving = true;
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for (int i = 0; i < (int)strlen(text)*(FONT_WIDTH+1) + SCREEN_W-1; i++) {
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if (i > 0) delay_ms(step);
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dmtx_clear(disp);
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printtext(disp, text, (SCREEN_W-1)-i, SCREEN_H/2-4);
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dmtx_show(disp);
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}
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text_moving = false;
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}
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