1 files changed, 59 insertions, 39 deletions

diff --git a/bin/main.lua b/bin/main.lua
index eeec09e..96898cf 100644
--- a/bin/main.lua
+++ b/bin/main.lua
@@ -1,25 +1,30 @@
-io.stdout:setvbuf("no")
-local shader
-local img
-local img2
-local canvas
-local sw, sh = jin.graphics.getSize()
+local boundary = {
+    x = 200,
+    y = 100, 
+    w = 100, 
+    h = 80,
+}
+
+local bg = {
+    x = 200,
+    y = 100, 
+    w = 300, 
+    h = 200
+}
+local p = {
+    x = boundary.x + 10,
+    y = boundary.y + 10,
+    speed = 100,
+}
+
 function jin.core.onLoad()
-    local str = jin.filesystem.read("metaball.shader")
-    shader = jin.graphics.newShader(str)
-    local w, h = 256, 240
-	local bitmap = jin.graphics.newBitmap(w, h, {255, 255, 0, 255})
-	local b = bitmap:clone()
-	bitmap = nil
-	-- local bitmap2 = jin.graphics.newBitmap("img2.bmp")
-    img = jin.graphics.newTexture(b)
-    -- img2 = jin.graphics.newTexture(bitmap2)
-    canvas = jin.graphics.newCanvas(200, 200)
+
 end
--- extern vec3 iResolution;
--- extern number iGlobalTime;
--- extern vec4 iMouse;
-local mx, my = 0, 0
+
+local function clamp(x, a, b)
+    return math.min(math.max(x, a), b)
+end
+
 function jin.core.onEvent(e)
     if e.type == "Quit" then 
         jin.core.stop()
@@ -27,26 +32,41 @@ function jin.core.onEvent(e)
     if e.type == "KeyDown" then 
         if e.key == "Escape" then 
             jin.core.stop()
+        end 
+        if e.key == "Left" then 
+            p.x = p.x - p.speed
+        elseif e.key == "Right" then 
+            p.x = p.x + p.speed
+        elseif e.key == "Up" then 
+            p.y = p.y - p.speed
+        elseif e.key == "Down" then 
+            p.y = p.y + p.speed
         end
-    end
-    if e.type == "MouseMotion" then 
-        -- if e.button == "left" then 
-            mx = e.x 
-            my = e.y
-        -- end
-    end
+        p.x = clamp(p.x, boundary.x, boundary.x + boundary.w)
+        p.y = clamp(p.y, boundary.y, boundary.y + boundary.h)
+    end 
+end
+
+local function updateBg()
+    local x0 = boundary.x
+    local x1 = boundary.x + boundary.w
+    local tx = (p.x - x0) / (x1 - x0)
+    bg.x = tx * (x1 - x0 - bg.w) + x0
+    local y0 = boundary.y
+    local y1 = boundary.y + boundary.h
+    local ty = (p.y - y0) / (y1 - y0)
+    bg.y = ty * (y1 - y0 - bg.h) + y0
+end
+
+function jin.core.onUpdate(dt)
+    updateBg()
 end
 
-local dt = 0
 function jin.core.onDraw()
-    dt = dt + 0.1
-    jin.graphics.bindCanvas(canvas)
-    jin.graphics.useShader(shader)
-    shader:sendNumber("iGlobalTime", dt )
-    shader:sendVec3("iResolution", {sw, sh, 1})
-    shader:sendVec4("iMouse", {mx, my, mx, my})
-    jin.graphics.draw(img, 0, 0, 1, 1)
-    jin.graphics.unuseShader()
-    jin.graphics.unbindCanvas()
-    jin.graphics.draw(canvas, 0, 0, 2, 2)
-end
\ No newline at end of file
+    jin.graphics.setColor(100, 100, 100, 255)
+    jin.graphics.rect("fill", bg.x, bg.y, bg.w, bg.h)
+    jin.graphics.setColor(255,255,255,255)
+    jin.graphics.rect("line", boundary.x, boundary.y, boundary.w, boundary.h)
+    jin.graphics.setColor(255,0,0,255)
+    jin.graphics.rect("fill", p.x, p.y, 3, 3)
+end