GradientFill problem

[en liten kille]

Hi! I'm testing the gradientfill function but the compiler doesn't seem to recognize it or GRADIENT_FILL_TRIANGLE that is used as the last parameter.

void draw_triangle(HWND hwnd, HDC hdc, camera c1, triangle t1){
    POINT* result;
    TRIVERTEX vertex[3];
    GRADIENT_TRIANGLE gvertex;
    PAINTSTRUCT ps;

    hdc = BeginPaint(hwnd, &ps);
    result = project_triangle(c1, rotate_triangle(c1, t1));

    gvertex.Vertex1 = 0;
    gvertex.Vertex2 = 1;
    gvertex.Vertex3 = 2;

    vertex[0].x = result[0].x;
    vertex[0].y = result[0].y;
    vertex[0].Red = t1.color[0][0];
    vertex[0].Green = t1.color[1][0];
    vertex[0].Blue = t1.color[2][0];

    vertex[1].x = result[1].x;
    vertex[1].y = result[1].y;
    vertex[1].Red = t1.color[0][1];
    vertex[1].Green = t1.color[1][1];
    vertex[1].Blue = t1.color[2][1];

    vertex[2].x = result[2].x;
    vertex[2].y = result[2].y;
    vertex[2].Red = t1.color[0][2];
    vertex[2].Green = t1.color[1][2];
    vertex[2].Blue = t1.color[2][2];

    GradientFill(hdc, vertex, 3, &gvertex, 1, GRADIENT_FILL_TRIANGLE);

    EndPaint(hwnd, &ps);

This code is in a headerfile so maybe there is something I need to declare first. I don't know. What did I do wrong?

[webJose]

Always check the documentation of the Windows functions: http://msdn.microsoft.com/en-us/library/windows/desktop/dd144957(v=vs.85).aspx .

Near the end of the page, before any community additions you'll find the two pieces of information that you need to use the function: The header and the library.

#include the header and add the library to the list of additional libraries for the linker. The linker can also be taught by code using #pragma comment(lib, "theLibNameHere") .

[modoran]

I think you need to define WINVER first to target minimum windows 2000.