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[英]Why does my triangle in OpenGL (3) doesn't render using lwjgl?
[英]Why doesn't my OpenGL Radar implementation render on screen?
我想使用openGL为我的3D游戏实现雷达。 我一直在尝试以多种方式实现这一目标,但没有一个被批准是正确的。 这是下面的代码片段:
int xi, yi;
GLfloat x,z;
glPushMatrix();
{
glTranslatef(-0.8f, 0.2f, -3.0f);
glColor3f(0.0f, 0.0f, 1.0f);
x = playerTank->givePosX();
z = playerTank->givePosZ();
xi = (int)((x + 1000) / 20) + 5;
yi = (int)(((z + 1000) / 20) + screenHeight - 105);
glPushMatrix();
{
glScalef(xi,yi,1.0f);
glBegin(GL_QUADS);
glVertex2i(xi-5, yi-5);
glVertex2i(xi+5, yi-5);
glVertex2i(xi+5, yi+5);
glVertex2i(xi-5, yi+5);
glEnd();
}
glPopMatrix();
glColor3f(1.0f, 0.0f, 0.0f);
glPushMatrix();
{
glScalef(xi,yi,1.0f);
for (int i = 0; i < tanks.size(); i++)
{
x = tanks[i]->givePosX();
z = tanks[i]->givePosZ();
xi = (int)((x + 1000) / 20) + 5;
yi = (int)(((z + 1000) / 20) + screenHeight - 105);
if (xi > 0 && xi < 110 && yi > (screenHeight - 110) && yi < screenHeight)
{
if (tanks[i] != playerTank)
{
glBegin(GL_TRIANGLES);
glVertex2i(xi, yi-5);
glVertex2i(xi+5, yi+5);
glVertex2i(xi-5, yi+5);
glEnd();
}
}
}
}
glPopMatrix();
glColor3f(0.0f, 1.0f, 0.0f);
glPushMatrix();
{
glScalef(xi,yi,1.0f);
for (int i = 0; i < obstacles.size(); i++)
{
x = obstacles[i]->givePosX();
z = obstacles[i]->givePosZ();
xi = (int)((x + 1000) / 20) + 5;
yi = (int)(((z + 1000) / 20) + screenHeight - 105);
glBegin(GL_LINE_LOOP);
glVertex2i(xi-3, yi-3);
glVertex2i(xi+3, yi-3);
glVertex2i(xi+3, yi+3);
glVertex2i(xi-3, yi+3);
glEnd();
}
}
glPopMatrix();
}
glPopMatrix();
为什么屏幕上没有任何显示?
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