// -----------------------------------------------------------------------------
// Draw the canvas contents
// -----------------------------------------------------------------------------
void CropCanvas::draw()
{
// Setup for 2d
setup2D();
// Draw background
drawCheckeredBackground();
// Determine graphic position & scale
double width = GetSize().x;
double height = GetSize().y;
// Get image dimensions
auto& tex_info = OpenGL::Texture::info(texture_);
double x_dim = (double)tex_info.size.x;
double y_dim = (double)tex_info.size.y;
// Get max scale for x and y (including padding)
double x_scale = ((double)width - UI::scalePx(24)) / x_dim;
double y_scale = ((double)height - UI::scalePx(24)) / y_dim;
// Set scale to smallest of the 2 (so that none of the texture will be clipped)
double scale = std::min<double>(x_scale, y_scale);
glPushMatrix();
glTranslated(width * 0.5, height * 0.5, 0); // Translate to middle of area
glScaled(scale, scale, scale); // Scale to fit within area
// Draw graphic
double hw = 0;
double hh = 0;
if (texture_)
{
glEnable(GL_TEXTURE_2D);
hw = x_dim * -0.5;
hh = y_dim * -0.5;
Drawing::drawTexture(texture_, hw, hh);
}
// Draw cropping rectangle
OpenGL::setColour(0, 0, 0, 255, OpenGL::Blend::Normal);
glDisable(GL_TEXTURE_2D);
glTranslated(hw, hh, 0); // Translate to top-left of graphic
Drawing::drawLine(crop_rect_.tl.x, -1000, crop_rect_.tl.x, 1000); // Left
Drawing::drawLine(-1000, crop_rect_.tl.y, 1000, crop_rect_.tl.y); // Top
Drawing::drawLine(crop_rect_.br.x, -1000, crop_rect_.br.x, 1000); // Right
Drawing::drawLine(-1000, crop_rect_.br.y, 1000, crop_rect_.br.y); // Bottom
// Shade cropped-out area
OpenGL::setColour(0, 0, 0, 100, OpenGL::Blend::Normal);
Drawing::drawFilledRect(-1000, -1000, crop_rect_.tl.x, 1000); // Left
Drawing::drawFilledRect(crop_rect_.br.x, -1000, 1000, 1000); // Right
Drawing::drawFilledRect(crop_rect_.tl.x, -1000, crop_rect_.br.x, crop_rect_.tl.y); // Top
Drawing::drawFilledRect(crop_rect_.tl.x, crop_rect_.br.y, crop_rect_.br.x, 1000); // Bottom
glPopMatrix();
SwapBuffers();
}
// Display 2D overlay on top of 3D game
void display2D(void) {
// Set up OpenGL for 2D overlay
setup2D();
// Get width and height of screen
int width = glutGet(GLUT_WINDOW_WIDTH);
int height = glutGet(GLUT_WINDOW_HEIGHT);
// Radius of compass
int compassRadius = 100;
// Offset from edge of screen
int compassOffset = 50;
// Width of compass's hand (technically radius, but not a circle)
int compassHandWidth = 20;
// Center of compass radius (the small circle in the center)
int compassCenterRadius = 5;
// Number of triangles to generate the pseudo circle
// Incease for more accuracy
int compassNumOfTriangles = 64;
// Center of compass location on screen
int compassCenterX = width-(compassRadius+compassOffset);
int compassCenterY = height-(compassRadius+compassOffset);
// Color of compass, off-white
glColor3f(0.8f, 0.8f, 0.8f);
// Draw the Basic circle of the compass
glBegin(GL_POLYGON);
for(int i = 0; i < compassNumOfTriangles; i++) {
glVertex2f(
compassCenterX+(compassRadius*cos((float)i/((float)compassNumOfTriangles/2)*M_PI)),
compassCenterY+(compassRadius*sin((float)i/((float)compassNumOfTriangles/2)*M_PI)));
}
glEnd();
// Calculate the angle that would be North (+x)
float cardinalAngle = g_state.player.look.yaw - M_PI_2;
// Color of compass hand, pure red
glColor3f(1.0f, 0.0f, 0.0f);
// Draw the Compass Hand
glBegin(GL_POLYGON);
glVertex2f(
compassCenterX-compassRadius*cos(cardinalAngle),
compassCenterY+compassRadius*sin(cardinalAngle));
glVertex2f(
compassCenterX-compassHandWidth*cos(cardinalAngle+M_PI_2),
compassCenterY+compassHandWidth*sin(cardinalAngle+M_PI_2));
glVertex2f(
compassCenterX+compassHandWidth*cos(cardinalAngle),
compassCenterY-compassHandWidth*sin(cardinalAngle));
glVertex2f(
compassCenterX+compassHandWidth*cos(cardinalAngle+M_PI_2),
compassCenterY-compassHandWidth*sin(cardinalAngle+M_PI_2));
glEnd();
// Color of compass center, pure black
glColor3f(0.0f, 0.0f, 0.0f);
// Draw the basic circle for the center of the compass
glBegin(GL_POLYGON);
for(int i = 0; i < compassNumOfTriangles; i++) {
glVertex2f(
compassCenterX+(compassCenterRadius*cos((float)i/16*M_PI)),
compassCenterY+compassCenterRadius*sin((float)i/16*M_PI));
}
glEnd();
// Color of crosshair, pure black
glColor3f(0.0f, 0.0f, 0.0f);
// Draw crosshair 2 pixels thick in center of screen
glBegin(GL_QUADS);
glVertex2f(width/2-1, height/2-10);
glVertex2f(width/2+1, height/2-10);
glVertex2f(width/2+1, height/2+10);
glVertex2f(width/2-1, height/2+10);
glVertex2f(width/2-10, height/2-1);
glVertex2f(width/2+10, height/2-1);
glVertex2f(width/2+10, height/2+1);
glVertex2f(width/2-10, height/2+1);
glEnd();
}
