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Keyboard Not Responding.

closed account (2NywAqkS)
I have been beginning to use the Win32 API and I'm starting to making a simple top-down shooter however to get keyboard intput i used the code:

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case WM_KEYDOWN:
			{
				switch (wParam)
				{
				case 'w':
					{
						Xpos += cos(Soldier_angle) * 10;
						Ypos += sin(Soldier_angle) * 10;
						return 0;
					}
				case 's':
					{
						Xpos += cos(Soldier_angle+180) * 10;
						Ypos += sin(Soldier_angle+180) * 10;
						return 0;
					}
				case 'a':
					{
						Xpos += cos(Soldier_angle+270) * 10;
						Ypos += sin(Soldier_angle+270) * 10;
						return 0;
					}
				case 'd':
					{
						Xpos += cos(Soldier_angle+90) * 10;
						Ypos += sin(Soldier_angle+90) * 10;
						return 0;
					}
				default:
					break;
				}
			}


but nothing seems to respond.

this draws the Soldier:

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glPushMatrix();
	glTranslatef(Xpos, Ypos, 1.0);
	POINT cursorPos;
        GetCursorPos(&cursorPos);
        Soldier_angle = atan2(cursorPos.y-Ypos,cursorPos.x-Xpos)*180/3.14159265;
	glRotatef(Soldier_angle, 0,0,1);
	Square(48,"Soldier 1.raw",48,48);
	glPopMatrix();


What could be the problem? any help is much appreciated.

Thanks Rowan.
Disch (13742)
IIRC the key codes are uppercase. Try 'A', 'S', etc instead of 'a', 's', etc.
closed account (2NywAqkS)
Thank you that solved it!
closed account (2NywAqkS)
Another problem with it is that all keys the soldier moves toward the mouse. I expected 'S' to move him backwards but that doesn't happen. the movement is also a bit weird he moves in a little circle before he moves towards the mouse. Why?
I changed the keyboard input code to:
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case WM_KEYDOWN:
			{
				keys[wParam] = true;
				return 0;
			}

		case WM_KEYUP:
			{
				keys[wParam] = false;
				return 0;
			}

and made a key operations fuction:
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void KeyOperations(void)
{
			if (keys['W'])
				{
					Xpos += cos(Soldier_angle) * 0.1;
					Ypos += sin(Soldier_angle) * 0.1;
				}
			if (keys['S'])
				{
					Xpos += cos(Soldier_angle+180) * 0.1;
					Ypos += sin(Soldier_angle+180) * 0.1;
				}
			if (keys['A'])
				{
					Xpos += cos(Soldier_angle+270) * 0.1;
					Ypos += sin(Soldier_angle+270) * 0.1;
				}
			if (keys['D'])
				{
					Xpos += cos(Soldier_angle+90) * 0.1;
					Ypos += sin(Soldier_angle+90) * 0.1;
				}
}
Disch (13742)
1) Looks like soldier_angle is in degrees based on this:

Soldier_angle = atan2(cursorPos.y-Ypos,cursorPos.x-Xpos)*180/3.14159265

Which means you need to convert back to radians before you use it here:

Xpos += cos(Soldier_angle) * 0.1; // <- need radians, not degrees



2) angles rotate counter-clockwise, not clockwise. So you have 'A' and 'D' backwards. +90 degrees would go left, not right.
closed account (2NywAqkS)
Thankyou everything fixed!
Disch (13742)
np. Glad it's working.

It always bugged me how OpenGL does things in degrees. Blech.
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