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146 lines
5.0 KiB
146 lines
5.0 KiB
/*******************************************************************************************
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*
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* raylib [shapes] example - lines drawing
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*
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* Example complexity rating: [★☆☆☆] 1/4
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*
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* Example originally created with raylib 5.6-dev, last time updated with raylib 5.6
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*
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* Example contributed by Robin (@RobinsAviary) and reviewed by Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2025-2025 Robin (@RobinsAviary)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include "raymath.h"
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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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 - lines drawing");
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// Hint text that shows before you click the screen
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bool startText = true;
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// The mouse's position on the previous frame
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Vector2 mousePositionPrevious = GetMousePosition();
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// The canvas to draw lines on
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RenderTexture canvas = LoadRenderTexture(screenWidth, screenHeight);
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// The background color of the canvas
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const Color backgroundColor = RAYWHITE;
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// The line's thickness
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float lineThickness = 8.0f;
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// The lines hue (in HSV, from 0-360)
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float lineHue = 0.0f;
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// Clear the canvas to the background color
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BeginTextureMode(canvas);
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ClearBackground(backgroundColor);
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EndTextureMode();
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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// Disable the hint text once the user clicks
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if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT) && startText)
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{
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startText = false;
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}
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// Clear the canvas when the user middle-clicks
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if (IsMouseButtonPressed(MOUSE_BUTTON_MIDDLE))
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{
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BeginTextureMode(canvas);
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ClearBackground(backgroundColor);
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EndTextureMode();
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}
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// Store whether the left and right buttons are down
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bool leftButtonDown = IsMouseButtonDown(MOUSE_BUTTON_LEFT);
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bool rightButtonDown = IsMouseButtonDown(MOUSE_BUTTON_RIGHT);
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if (leftButtonDown || rightButtonDown)
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{
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// The color for the line
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Color drawColor;
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if (leftButtonDown)
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{
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// Increase the hue value by the distance our cursor has moved since the last frame (divided by 3)
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lineHue += Vector2Distance(mousePositionPrevious, GetMousePosition())/3.0f;
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// While the hue is >=360, subtract it to bring it down into the range 0-360
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// This is more visually accurate than resetting to zero
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while (lineHue >= 360.0f)
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{
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lineHue -= 360.0f;
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}
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// Create the final color
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drawColor = ColorFromHSV(lineHue, 1.0f, 1.0f);
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}
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else if (rightButtonDown)
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{
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// Use the background color as an "eraser"
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drawColor = backgroundColor;
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}
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// Draw the line onto the canvas
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BeginTextureMode(canvas);
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// Circles act as "caps", smoothing corners
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DrawCircleV(mousePositionPrevious, lineThickness/2.0f, drawColor);
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DrawCircleV(GetMousePosition(), lineThickness/2.0f, drawColor);
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DrawLineEx(mousePositionPrevious, GetMousePosition(), lineThickness, drawColor);
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EndTextureMode();
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}
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// Update line thickness based on mousewheel
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lineThickness += GetMouseWheelMove();
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lineThickness = Clamp(lineThickness, 1.0, 500.0f);
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// Update mouse's previous position
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mousePositionPrevious = GetMousePosition();
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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// Draw the render texture to the screen, flipped vertically to make it appear top-side up
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DrawTextureRec(canvas.texture, (Rectangle){ 0.0f, 0.0f, (float)canvas.texture.width,(float)-canvas.texture.height }, Vector2Zero(), WHITE);
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// Draw the preview circle
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if (!leftButtonDown) DrawCircleLinesV(GetMousePosition(), lineThickness/2.0f, (Color){ 127, 127, 127, 127 });
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// Draw the hint text
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if (startText) DrawText("try clicking and dragging!", 275, 215, 20, LIGHTGRAY);
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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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// Unload the canvas render texture
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UnloadRenderTexture(canvas);
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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