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@ -1,8 +1,8 @@ |
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/******************************************************************************************* |
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* |
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* raylib [shapes] example - starfield |
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* raylib [shapes] example - starfield effect |
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* |
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* Example complexity rating: [★☆☆☆] 1/4 |
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* Example complexity rating: [★★☆☆] 2/4 |
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* |
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* Example originally created with raylib 5.5, last time updated with raylib 5.6-dev |
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* |
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@ -31,7 +31,7 @@ int main(void) |
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const int screenWidth = 800; |
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const int screenHeight = 450; |
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - starfield"); |
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - starfield effect"); |
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Color bgColor = ColorLerp(DARKBLUE, BLACK, 0.69f); |
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@ -45,9 +45,10 @@ int main(void) |
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Vector2 starsScreenPos[STAR_COUNT] = { 0 }; |
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// Setup the stars with a random position |
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for (int i = 0; i < STAR_COUNT; i++) { |
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stars[i].x = GetRandomValue(-screenWidth*.5, screenWidth*.5); |
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stars[i].y = GetRandomValue(-screenHeight*.5, screenHeight*.5); |
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for (int i = 0; i < STAR_COUNT; i++) |
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{ |
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stars[i].x = GetRandomValue(-screenWidth*0.5f, screenWidth*0.5f); |
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stars[i].y = GetRandomValue(-screenHeight*0.5f, screenHeight*0.5f); |
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stars[i].z = 1.0f; |
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} |
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@ -59,39 +60,36 @@ int main(void) |
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{ |
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// Update |
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//---------------------------------------------------------------------------------- |
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// Change speed based on number keys |
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for (int i = 0; i <= 9; i++) { |
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if (IsKeyPressed(KEY_ZERO + i)) { |
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speed = 2.0f * (float)i / 9.0f; |
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} |
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} |
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// Change speed based on mouse |
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float mouseMove = GetMouseWheelMove(); |
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if ((int)mouseMove != 0) speed += 2.0f*mouseMove/9.0f; |
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if (speed < 0.0f) speed = 0.1f; |
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else if (speed > 2.0f) speed = 2.0f; |
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// Toggle lines / points with space bar |
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if (IsKeyPressed(KEY_SPACE)) { |
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drawLines = !drawLines; |
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} |
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if (IsKeyPressed(KEY_SPACE)) drawLines = !drawLines; |
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float dt = GetFrameTime(); |
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for (int i = 0; i < STAR_COUNT; i++) { |
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for (int i = 0; i < STAR_COUNT; i++) |
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{ |
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// Update star's timer |
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stars[i].z -= dt * speed; |
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stars[i].z -= dt*speed; |
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// Calculate the screen position |
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starsScreenPos[i] = (Vector2) { |
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screenWidth*.5f + stars[i].x / stars[i].z, |
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screenHeight*.5f + stars[i].y / stars[i].z, |
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starsScreenPos[i] = (Vector2){ |
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screenWidth*0.5f + stars[i].x/stars[i].z, |
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screenHeight*0.5f + stars[i].y/stars[i].z, |
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}; |
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// If the star is too old, or offscreen, it dies and we make a new random one |
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if (stars[i].z < 0.0f |
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o">|| starsScreenPos[i].x < 0 || starsScreenPos[i].y < 0.0f |
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|| starsScreenPos[i].x > screenWidth || starsScreenPos[i].y > screenHeight) { |
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stars[i].x = GetRandomValue(-screenWidth*.5, screenWidth*.5); |
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stars[i].y = GetRandomValue(-screenHeight*.5, screenHeight*.5); |
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if (p">(stars[i].z < 0.0f) || (starsScreenPos[i].x < 0) || (starsScreenPos[i].y < 0.0f) || |
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p">(starsScreenPos[i].x > screenWidth) || p">(starsScreenPos[i].y > screenHeight)) |
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{ |
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stars[i].x = GetRandomValue(-screenWidth*0.5f, screenWidth*0.5f); |
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stars[i].y = GetRandomValue(-screenHeight*0.5f, screenHeight*0.5f); |
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stars[i].z = 1.0f; |
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} |
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} |
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//---------------------------------------------------------------------------------- |
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// Draw |
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@ -100,42 +98,47 @@ int main(void) |
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ClearBackground(bgColor); |
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for (int i = 0; i < STAR_COUNT; i++) { |
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if (drawLines) { |
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for (int i = 0; i < STAR_COUNT; i++) |
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{ |
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if (drawLines) |
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{ |
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// Get the time a little while ago for this star, but clamp it |
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float t = Clamp(stars[i].z + 1.0f/32.0f, 0.0f, 1.0f); |
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// If it's different enough from the current time, we proceed |
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if (t - stars[i].z > 1e-3) { |
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if ((t - stars[i].z) > 1e-3) |
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{ |
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// Calculate the screen position of the old point |
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Vector2 startPos = (Vector2) { |
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screenWidth*.5f + stars[i].x / t, |
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screenHeight*.5f + stars[i].y / t, |
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Vector2 startPos = (Vector2){ |
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screenWidth*0.5f + stars[i].x/t, |
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screenHeight*0.5f + stars[i].y/t, |
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}; |
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// Draw a line connecting the old point to the current point |
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DrawLineV(startPos, starsScreenPos[i], RAYWHITE); |
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} |
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} |
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else { |
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else |
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{ |
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// Make the radius grow as the star ages |
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float radius = Lerp(stars[i].z, 1.0f, 5.0f); |
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// Draw the circle |
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DrawCircleV(starsScreenPos[i], radius, RAYWHITE); |
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} |
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} |
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DrawFPS(10, 10); |
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DrawText(TextFormat("[MOUSE WHEEL] Current Speed: %.0f", 9.0f*speed/2.0f), 10, 40, 20, RAYWHITE); |
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DrawText(TextFormat("[SPACE] Current draw mode: %s", drawLines ? "Lines" : "Circles"), 10, 70, 20, RAYWHITE); |
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DrawText(TextFormat("Current Speed: %.0f [Number keys to change]", 9.0f * speed / 2.0f), 10, 30, 20, RAYWHITE); |
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DrawText(TextFormat("Drawing %s [Space to change]", drawLines ? "Lines" : "Circles"), 10, 50, 20, RAYWHITE); |
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DrawFPS(10, 10); |
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EndDrawing(); |
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//---------------------------------------------------------------------------------- |
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} |
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// De-Initialization |
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//-------------------------------------------------------------------------------------- |
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CloseWindow(); // Close window and OpenGL context |
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//-------------------------------------------------------------------------------------- |
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Ray
1 week ago
