453ea65619
- Either a single string will be drawn to screen, or nothing will be drawn. - Intelligently registers and unregisters drawing callback to minimize overhead when no message is being displayed. - Currently does not support newline characters (\r or \n). Newlines will cause text to be drawn overlapped.
73 lines
1.4 KiB
C++
73 lines
1.4 KiB
C++
#include "xpcDrawing.h"
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#include "XPLMDisplay.h"
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#include "XPLMGraphics.h"
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//Internal Memory
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static int msgEnabled = 0;
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static int msgX = -1;
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static int msgY = -1;
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static char* msgVal = NULL;
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static float rgb[4] = { 0.5F, 1.0F, 0.5F };
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//Internal Functions
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static int MessageDrawCallback(XPLMDrawingPhase inPhase, int inIsBefore, void * inRefcon)
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{
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if (msgVal)
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{
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XPLMDrawString(rgb, msgX, msgY, msgVal, NULL, xplmFont_Basic);
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}
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return 1;
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}
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//Public Functions
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void XPCClearMessage()
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{
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if (msgVal != NULL)
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{
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free(msgVal);
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}
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msgVal = NULL;
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if (msgEnabled)
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{
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XPLMUnregisterDrawCallback(MessageDrawCallback, xplm_Phase_LastCockpit, 0, NULL);
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msgEnabled = 0;
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}
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}
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void XPCSetMessage(int x, int y, char* msg)
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{
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//Determine size of message and clear instead if the message string
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//is empty.
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size_t len = strlen(msg);
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if (len == 0)
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{
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XPCClearMessage();
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return;
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}
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//Try to size msgVal to fit the new message. If we fail for any
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//reason, clear the message and bail.
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if (msgVal != NULL)
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{
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msgVal = (char*)realloc(msgVal, len);
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}
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else
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{
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msgVal = (char*)malloc(len);
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}
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if (!msgVal)
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{
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XPCClearMessage();
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return;
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}
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//Set the message, location, and enable drawing if necessary.
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strcpy(msgVal, msg);
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msgX = x < 0 ? 10 : x;
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msgY = y < 0 ? 600 : y;
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if (!msgEnabled)
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{
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XPLMRegisterDrawCallback(MessageDrawCallback, xplm_Phase_LastCockpit, 0, NULL);
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msgEnabled = 1;
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}
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} |