The following sample code uses an image driver to create a custom hatch pattern. This image is then textured onto a shell (quad).
You can copy/paste the sample code to HOOPS PartViewer’s OnExtraSlot5
static void buildLines(double range, double z, double count, int priority) {
double const d = range;
HC_Set_Color("black");
for (double i = -d + d / count; i < d; i += d / count) {
HC_KEY key = HC_Insert_Line(-d, i, z, d, i, z);
HC_Set_Priority(key, priority);
}
}
static void renderToTexture(HC_KEY scene, const char *image_driver, const char *name,int width, int height)
{
HC_KEY image_key;
char buff[4096];
HPoint pos(0, 0, 10);
HPoint tar(0, 0, -19);
HPoint up(0, 1, 0);
float const d = 10;
float const z1 = -10;
int const priority = 1337;
HC_Open_Segment ("/null");
{
HC_Set_Visibility("images");
sprintf(buff, "rgba, name=%s", name);
image_key = HC_KInsert_Image(0.0, 0.0, 0.0, buff, width, height, 0);
}HC_Close_Segment ();
HC_Open_Segment(image_driver);
{
sprintf(buff, "isolated, debug=0x0100000, use window id=0x%p", image_key);
HC_Set_Driver_Options(buff);
HC_Set_Window_Frame("off");
HC_KEY ret = HC_Open_Segment("lines"); {
HC_Set_Camera(&pos, &tar, &up, 8, 8, "orthographic");
HC_Set_Visibility("lines=on");
HC_Set_Color("windows=white");
// For simiplicity, I am only using a single line pattern
buildLines(d, z1 - 9, 20, priority + 1);
HC_Set_Line_Pattern("-..");
} HC_Close_Segment();
HC_Update_One_Display(".");
}HC_Close_Segment();
// edit image to change all white pixels and make it transparent
unsigned char * bytes = new unsigned char[width * height * 4];
float x, y, z;
int w, h;
char format[256];
HC_Show_Image(image_key, &x, &y, &z, format, &w, &h, bytes);
unsigned char * current = bytes;
for (int i = 0; i < width * height; ++i) {
if (current[i] == 255 && current[i+1] == 255 && current[i+2] == 255)
current[i+3] = 0;
current += 3;
}
HC_Edit_Image(image_key, 0, 0, width, height, bytes);
delete[] bytes;
// image driver is no longer needed
HC_Delete_Segment(image_driver);
}
void CSolidHoopsView::OnExtraSlot5()
{
HC_KEY object_key, image_key;
HPoint points[5];
points[4].x = -0.5; points[4].y = -0.5; points[4].z = 0;
points[3].x = 0.5; points[3].y = -0.5; points[3].z = 0;
points[2].x = 0.5; points[2].y = 0.5; points[2].z = 0;
points[1].x = -0.5; points[1].y = 0.5; points[1].z = 0;
points[0].x = -0.5; points[0].y = -0.5; points[0].z = 0;
char imageDriver[256];
sprintf(imageDriver, "?driver/%s/image", m_pHView->GetDriverType());
renderToTexture(m_pHView->GetSceneKey(), imageDriver, "texture1", 528, 528);
HC_Open_Segment_By_Key(m_pHView->GetModelKey()); {
float points[] = { 0,0,0, 1,0,0, 1,1,0, 0,1,0 };
int flist[] = { 4, 0,1,2,3 };
HC_Open_Segment(""); {
HC_KEY k = HC_KInsert_Shell(4, points, 5, flist);
HC_MSet_Vertex_Parameters(k, 0, 4, 3, points);
HC_Set_Color("faces = (texture1)");
} HC_Close_Segment();
} HC_Close_Segment();
m_pHView->Update();
}
Sphere is inserted to show that texture is transparent
