画直线

23_day/console.c

@@ -367,6 +367,12 @@ int *hrb_api(int edi, int esi, int ebp, int esp, int ebx, int edx, int ecx, int
 	} else if (edx == 12) {
 		sht = (struct SHEET *) ebx;
 		sheet_refresh(sht, eax, ecx, esi, edi);
+	} else if (edx == 13) {
+		sht = (struct SHEET *) (ebx & 0xfffffffe);
+		hrb_api_linewin(sht, eax, ecx, esi, edi, ebp);
+		if ((ebx & 1) == 0) {
+			sheet_refresh(sht, eax, ecx, esi + 1, edi + 1);
+		}
 	}
 	return 0;
 }
@@ -392,3 +398,52 @@ int *inthandler0d(int *esp)
 	cons_putstr0(cons, s);
 	return &(task->tss.esp0);	/*强制结束程序*/
 }
+
+void hrb_api_linewin(struct SHEET *sht, int x0, int y0, int x1, int y1, int col)
+{
+	int i, x, y, len, dx, dy;
+
+	dx = x1 - x0;
+	dy = y1 - y0;
+	x = x0 << 10;
+	y = y0 << 10;
+	if (dx < 0) {
+		dx = - dx;
+	}
+	if (dy < 0) {
+		dy = - dy;
+	}
+	if (dx >= dy) {
+		len = dx + 1;
+		if (x0 > x1) {
+			dx = -1024;
+		} else {
+			dx =  1024;
+		}
+		if (y0 <= y1) {
+			dy = ((y1 - y0 + 1) << 10) / len;
+		} else {
+			dy = ((y1 - y0 - 1) << 10) / len;
+		}
+	} else {
+		len = dy + 1;
+		if (y0 > y1) {
+			dy = -1024;
+		} else {
+			dy =  1024;
+		}
+		if (x0 <= x1) {
+			dx = ((x1 - x0 + 1) << 10) / len;
+		} else {
+			dx = ((x1 - x0 - 1) << 10) / len;
+		}
+	}
+
+	for (i = 0; i < len; i++) {
+		sht->buf[(y >> 10) * sht->bxsize + (x >> 10)] = col;
+		x += dx;
+		y += dy;
+	}
+
+	return;
+}